Both sublimation and ———— occur only on the surface of a substance.

Answers

Answer 1
Both sublimation and evaporation occur only on the surface of a substance. 

Good luck.

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If the caffeine concentration in a particular brand of soda is 4.05 mg/oz, drinking how many cans of soda would be lethal? Assume 10.0 grams of caffeine is a lethal dose, and there are 12 oz in a can.

Please explain the steps you used.

Answers

There are 1,000 milligrams (mg) in one gram:
In 10 grams, there are 10 x 1,000 = 10,000 milligrams. This is a lethal dose of caffeine.

There are 4.05 mg/oz (milligrams/ounce) of caffeine in the soda. 
In a 12 ounce can, there are 4.05 x 12 = 48.6 milligrams.

How many sodas would it take to kill you?
To find this, we divide the lethal dose amount (10,000 mg) by the amount of caffeine per can (48.6 mg).
10,000 ÷ 48.6 = 205.76. 

Since 205 cans is not quite 10,000 mg, technically it would take 206 cans of soda to consume a lethal dose of caffeine. 

Which carboxylic acid has the lowest boiling point?

Answers

methanoic acid :33333

According to the forces of attraction, the carboxylic acid with  lowest boiling point is methanoic acid.

What are forces of attraction?

Forces of attraction is a force by which atoms in a molecule  combine. it is basically an attractive force in nature.  It can act between an ion  and an atom as well.It varies for different  states  of matter that is solids, liquids and gases.

The forces of attraction are maximum in solids as  the molecules present in solid are tightly held while it is minimum in gases  as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.

The physical properties such as melting point, boiling point, density  are all dependent on forces of attraction which exists in the substances.

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sodium an alkali metal and chlorine a halogen are both in period 3 of the periodic table which element has a higher ionization energy

Answers

Answer  

Chlorine has higher ionization energy

Explanation

Ionization energy is defined as the minimum amount of energy required to remove the most loosely bound electron, the valence electron, of an isolated neutral gaseous atom, molecule or ion. It is quantitatively expressed in symbols as

X + energy → X+ + e−

Where X is any atom, molecule or ion capable of being ionized, X+ is that atom or molecule with an electron removed, and e− is the removed electron. This is generally an endothermic process.

The ionization energy of Sodium (alkali metal) is 496KJ/mol whereas Chlorine's first ionization energy is 1251.1 KJ/mol.  

Alkali metals (IA group) have small ionization energies, especially when compared to halogens.  Because as we move across the period from left to right, in general, the ionization energy increases. The atoms become smaller which causes the nucleus to have greater attraction for the valence electrons. Therefore, the electrons are more difficult to remove.


[tex]\boxed{{\text{Chlorine}}}[/tex] has higher ionization energy than sodium.

Further Explanation:

Ionization energy:

It is the amount of energy that is required to remove the most loosely bound valence electrons from the isolated neutral gaseous atom. It is denoted by IE. The value of IE is related to the ease of removing the outermost valence electrons. If these electrons are removed so easily, small ionization energy is required and vice-versa. It is inversely proportional to the size of the atom.

Ionization energy trends in the periodic table:

1. Along the period, IE increases due to the decrease in the atomic size of the succeeding members. This results in the strong attraction of electrons and hence are difficult to remove.

2. Down the group, IE decreases due to the increase in the atomic size of the succeeding members. This results in the lesser attraction of electrons and hence are easy to remove.

Sodium and chlorine are present in period 3 of the periodic table. Sodium lies to the left region of the period while chlorine lies to the right.

The atomic number of sodium atom [tex]\left({{\text{Na}}}\right)[/tex] that lies in left region of the period 3 is 11 and its electronic configuration is [tex]{\mathbf{1}}{{\mathbf{s}}^{\mathbf{2}}}{\mathbf{2}}{{\mathbf{s}}^{\mathbf{2}}}{\mathbf{2}}{{\mathbf{p}}^{\mathbf{6}}}{\mathbf{3}}{{\mathbf{s}}^{\mathbf{1}}}[/tex] . The atomic number of chlorine is 17 and its electronic configuration is [tex]{\mathbf{1}}{{\mathbf{s}}^{\mathbf{2}}}{\mathbf{2}}{{\mathbf{s}}^{\mathbf{2}}}{\mathbf{2}}{{\mathbf{p}}^{\mathbf{6}}}{\mathbf{3}}{{\mathbf{s}}^{\mathbf{2}}}{\mathbf{3}}{{\mathbf{p}}^{\mathbf{5}}}[/tex] . Sodium has only one electron in its outermost valence shell that can be removed easily in order to achieve the nearest stable noble gas configuration of He, resulting in its low ionization energy. Chlorine is one electron short of noble gas so it can gain an electron easily, but its removal requires a large amount of energy. So the ionization energy of chlorine is higher than that of sodium.

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2. Write the chemical equation for the first ionization energy of lithium: https://brainly.com/question/5880605

Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Periodic classification of elements

Keywords: ionization energy, sodium, atomic number, electron, neutral, isolated, gaseous atom, IE, chlorine, group, period, higher.

Why would gamma radiation be used in diagnostic imaging rather than alpha or beta radiation?

Answers

Gamma radiation is a very short wavelength electromagnetic emission, and can pass through soft tissue easily. Alpha and beta particles possess less energy and cannot easily pass through tissue. 
An x-ray is a 'negative' of body structure; gamma rays pass freely through soft tissue and expose the film, but gamma rays don't pass through bony structures well, leaving the film underexposed.

a car travels 57.9 miles per hour for 3.2 hours estimate the number of miles driven

Answers

The car would have traveled an estimated distance of approximately 185 miles.

The formula for distance which is:

Distance = Speed  x Time

In this case, the estimated distance would be:

Distance = 57.9 miles/hour x 3.2 hours

Now, do the multiplication:

Distance ≈ 57.9 x 3.2

Distance ≈ 185.28 miles

Therefore, the umber of miles driven is 185 miles.

replacing standard incandescent lightbulbs with energy-efficient compact fluorescent lightbulbs can save a lot of energy. Calculate the amount if energy saved over 10 h when one 60 W incandescent lightbulb is replaced with an equivalent 18 W compact fluorescent lightbulb

Answers

The difference between the wattage is 60-18=42W. The saving in energy over 10 hrs is 10×42=420 watt-hours=0.42kWh

By replacing one 60W incandescent lightbulb with an 18W compact fluorescent lightbulb, you would save 420 watt-hours of energy over 10 hours.

To calculate the amount of energy saved over 10 hours when one 60W incandescent lightbulb is replaced with an 18W compact fluorescent lightbulb, we need to find the energy consumed by each type of bulb and then calculate the difference.

Energy consumed by a bulb can be calculated using the formula:

Energy (in watt-hours) = Power (in watts) × Time (in hours)

Let's calculate the energy consumed by each bulb:

For the 60W incandescent lightbulb:

Energy consumed = 60W × 10 hours = 600 watt-hours

For the 18W compact fluorescent lightbulb:

Energy consumed = 18W × 10 hours = 180 watt-hours

Now, let's calculate the energy saved:

Energy saved = Energy consumed by incandescent bulb - Energy consumed by compact fluorescent bulb

Energy saved = 600 watt-hours - 180 watt-hours

Energy saved = 420 watt-hours

So, by replacing one 60W incandescent lightbulb with an 18W compact fluorescent lightbulb, you would save 420 watt-hours of energy over 10 hours.

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For the following reaction, what volume of NOBr can be produced from 3.8 L of Br2 (measured at the same temperature and pressure), assuming an excess of NO?
2NO(g)+Br2(g)=2NO(Br)2

Answers

Answer:

[tex]7.6LNOBr[/tex]

Explanation:

Hello,

In this case, since no temperature and pressure are known, one could develop the stoichiometric relationship for 1 mole of [tex]Br_2[/tex] per 2 moles of [tex]NOBr[/tex] in terms of volume as shown below because of the Avogadro's law (change in mole proportional to the change in volume at constant both pressure and temperature):

[tex]3.8LBr_2*\frac{2LNOBr}{1LBr_2} =7.6LNOBr[/tex]

Best regards.

The pH of a vinegar solution is 4.15. What is the H+ concentration of the solution

Answers

The pH of a vinegar solution is 4.15. To find the H+ concentration of the solution use the following equation -log(H+)=pH. Insert the pH into the equation to get, -log(H+) = 4.15 Rearrange the equation to get, 10^(-4.15) = H+ Finally, you can solve for H+. The hydrogen ion concentration of the vinegar solution is .0000708 M.

The [tex]{{\text{H}}^+}[/tex] concentration of vinegar solution is [tex]\boxed{{\text{0}}{\text{.0000708 M}}}[/tex]

Further Explanation:

An acid is a substance that has the ability to donate [tex]{{\mathbf{H}}^{\mathbf{+}}}[/tex]ions or can accept electrons from the electron-rich species. The general dissociation reaction of acid is as follows:

[tex]{\text{HA}}\to{{\text{H}}^+}+{{\text{A}}^-}[/tex]

Here, HA is an acid.

The acidic strength of an acid can be determined by pH value. The negative logarithm of hydronium ion concentration is defined as pH of the solution. Lower the pH value of an acid, the stronger will be the acid. Acidic solutions are likely to have pH less than 7. Basic or alkaline solutions have pH more than 7. Neutral solutions have pH equal to 7.

Vinegar contains acetic acid [tex]\left({{\text{C}}{{\text{H}}_3}{\text{COOH}}}\right)[/tex], water and some traces of other chemicals and flavors.

The formula to calculate pH is as follows:

[tex]{\text{pH}}=-{\text{log}}\left[{{{\text{H}}^+}}\right][/tex]                                   …… (1)

Here,

[tex]\left[{{{\text{H}}^+}}\right][/tex] is hydrogen ion concentration.

On rearranging equation (1), we get:

[tex]\left[{{{\text{H}}^+}}\right]={10^{-{\text{pH}}}}[/tex]                                           …… (2)

The pH of vinegar is 4.15.

Substitute 4.15 for pH in equation (2)

[tex]\begin{gathered}\left[{{{\text{H}}^+}}\right]={10^{-4.15}}\\=0.0000707946\\\approx0.0000708\;{\text{M}}\\\end{gathered}[/tex]

So the concentration of [tex]{{\mathbf{H}}^{\mathbf{+}}}[/tex] ion in vinegar is 0.0000708 M.

Learn more:

1. The reason for the acidity of water https://brainly.com/question/1550328

2. Reason for the acidic and basic nature of amino acid. https://brainly.com/question/5050077

Answer details:

Grade: High School

Subject: Chemistry

Chapter: Acid, base and salts.

Keywords: pH, neutral, acidic, basic, alkaline, 4.15, vinegar, acetic acid, water, chemicals, negative logarithm, H+, 0.0000708 M, pH more than 7, pH less than 7, pH equal to 7.

how does the structure of covalent bonds affects their structure.

Answers

Covalent bond is a type of chemical bond which is formed as a result of sharing of electron pairs among the elements that are involved. The structure of the covalent bond is affected by the electronegativity of the elements involved. The molecules joined by covalent bond range in size from very small to very large polymers. There are different types of structures for covalent substances, these include: macromolecular substances, molecular substances and giant covalent structures. Strong bonds hold individual molecules together but there are negligible forces of attraction among them.

Describe an alternate method for determining the molar concentration of your unknown sample of copper (ii) sulfate solution, using the standard data

Answers

Final answer:

The molar concentration of an unknown copper (ii) sulfate solution can be determined by reacting it with excess zinc, calculating the moles of copper obtained and hence the moles of copper sulfate, and subsequently the molar concentration.

Explanation:

An alternate method for determining the molar concentration of an unknown sample of copper (ii) sulfate solution involves a series of calculative steps. Firstly, we must know the stoichiometric factor between the copper (ii) sulfate and a known substance. In this case, we can use the reaction of copper sulfate with excess zinc metal as a reference in a standard data.

Here's how to calculate: Upon reaction of a known mass of copper sulfate with excess zinc metal, a certain mass of copper metal is obtained. Using this equation:CuSO4 (aq) + Zn (s).

Step 1: Calculate the number of moles of copper obtained from the mass using the molar mass of copper. Step 2: This number of moles is the same as the moles of copper sulfate in your sample because of the 1:1 stoichiometry in the reaction. Step 3: Determine the molar concentration (M) of the solution by using the formula M = moles of solute / volume of solution (in liters). If the volume of the solution is unknown, you can use other identifying tests, such as a titration.

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Final answer:

To determine the molar concentration of copper (II) sulfate solution, an alternate method can be used. This method involves finding the mass of CuSO4, converting it to moles using Avogadro's number, and then dividing the moles by the volume of the solution to calculate the molar concentration.

Explanation:

An alternate method for determining the molar concentration of the unknown copper (II) sulfate solution can be done using the standard data. One way to do this is by finding the mass of CuSO4 and using Avogadro's number to convert it to moles. Then, divide the moles of CuSO4 by the volume of the solution in liters to calculate the molar concentration.

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Why does naphthalene have a higher melting point than biphenyl?

Answers

polar compounds have higher melting and boiling points than nonpolar compounds due to strong intermolecular forces such as hydrogen bonds and dipole-dipole interactions.

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In Part A, you found the amount of product (1.80 mol P2O5 ) formed from the given amount of phosphorus and excess oxygen. In Part B, you found the amount of product (1.40 mol P2O5 ) formed from the given amount of oxygen and excess phosphorus. Now, determine how many moles of P2O5 are produced from the given amounts of phosphorus and oxygen.

Answers

Final answer:

The number of moles of P2O5 produced from the given amounts of phosphorus and oxygen is equal to the number of moles of phosphorus or oxygen used.

Explanation:

To determine the number of moles of P2O5 produced from the given amounts of phosphorus and oxygen, you need to compare the amounts of each reactant used in Part A and Part B. Based on the given information, it is stated that in Part A, 1.80 mol of P2O5 is formed from a given amount of phosphorus and excess oxygen. In Part B, 1.40 mol of P2O5 is formed from a given amount of oxygen and excess phosphorus. Since the stoichiometry of the reaction is a 1:1 ratio between P2O5 and phosphorus, we can conclude that 1.80 mol of phosphorus is required to produce 1.80 mol of P2O5. Similarly, 1.40 mol of oxygen is required to produce 1.40 mol of P2O5. Therefore, the number of moles of P2O5 produced from the given amounts of phosphorus and oxygen is equal to the number of moles of phosphorus or oxygen used, which is 1.80 mol and 1.40 mol respectively.

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How many carbons are in the planar double-bond system of 3-methylcyclopentene?

Answers

There are a total of four (4) carbon that are in the planar double-bond system of 3-methylcyclopentene. The 3-methylcyclopentene can be found in spices and herbs, it is also a constituent of the flowers of Jasminum sambac (Arabian jasmine). It is also belongs to the family of Aliphatic Homomonocyclic Compounds.
There are a total of four (4) carbon that are in the planar double-bond system of 3-methylcyclopentene.

Of the five carbons in the cyclopentene, 1 carbon is attached with CH3 group while the other 4 are attached with H atoms which are in the same plane as of double bond. The carbon of the cycle attached with CH3 group are not in same plane as the rest of the carbon  of cyclopentene.

Caffeine (c8h10n4o2) is a weak base with a pkb of 10.4. part a calculate the ph of a solution containing a caffeine concentration of 430 mg/l .

Answers

Concentration of caffeine is 430 mg/L = 0.43g/L 
The molar mass of caffeine is 194.19 g/mol 

Therefore the molarity is:

Molarity = (0.43/194.19) mol/L 
Molarity = 0.002214 mol/L 
Molarity = 0.002214 M 

Given pKb = 10.4:

Kb = 10^-pKb = 10^ -10.4 = 3.981 x 10^ -11 

Kb is equivalent to:
Kb = [caffeine H+][OH-] / [caffeine] 
3.981 x 10^ -11 = [caffeine H+][OH-] / (0.002214) 
[caffeineH+][OH-] = 8.815 x 10^ -14 

But since:
[caffeineH+] = [OH-] 

Hence,

[OH-]^2 = 8.815 x 10^ -14 
[OH-] = 2.969 x 10^ -7 

The formula for pH is:

pH = 14 + log [OH-]

pH = 7.47
Final answer:

The pH of a solution containing a caffeine concentration of 430 mg/L is 4.75.

Explanation:

To calculate the pH of a caffeine solution, we can first use the provided pKb (10.4) to find the Kb, using the equation Kb = 10^(-pKb). We can then use the Kb to find the concentration of OH-, represented by the equilibrium C8H10N4O₂ (aq) + H₂O(1) ⇒ C8H10N4O₂H+ (aq) + OH¯ (aq). By inserting the equilibrium concentrations into the Kb expression and solving, we can find the OH- concentration.

The pH of a solution containing a caffeine concentration of 430 mg/L can be calculated using the equilibrium constant expression for caffeine. The equilibrium equation is: C8H10N4O2(aq) + H2O(l) ⇌ C8H10N4O2H+(aq) + OH-(aq). By substituting the given concentrations into the expression, the pH can be determined. The equation gives a pH of 4.75 for the solution.

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The scattering of light by a colloidal suspension is called the

Answers

Answer: The correct answer is Tyndall effect.

Explanation:

Colloids are defined as the mixtures where the size of the particle is within the range of 2nm to 1000 nm. In these mixtures, physical boundary is seen between the dispersed phase and dispersed medium.

Tyndall effect is defined as the effect in which scattering of light takes place by the particles present in a colloid or in very fine suspension.

For Example: Scattering of sunlight by clouds

Thus, the correct answer is Tyndall effect.

The scattering of light by a colloidal suspension is known as the Tyndall effect.

What does this mean?

When a beam of light passes through a colloidal solution or a suspension, the suspended particles disperse and scatter the light.

This scattering is more pronounced when the suspended particles are larger in size compared to the wavelength of the light. The scattered light becomes visible, creating a cone or beam of light that is observable in the direction of the incident light. The Tyndall effect is often used to study and characterize colloidal systems, as it provides valuable information about particle size, concentration, and overall dispersion.

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How many moles of o2 are required for the complete reaction of 54.7 g of c2h4 to form co2 and h2o?

Answers

The balanced chemical equation that illustrates this reaction is:
C2H4 + 3O2 --> 2CO2 + 2H2O 

From the periodic table:
mass of carbon = 12 grams
mass of hydrogen = 1 gram
Therefore:
molar mass of C2H4 = 12(2) + 4(1) = 24 + 4 = 28 grams

number of moles = mass / molar mass
number of moles of C2H4 = 54.7 / 28 = 1.95 moles

From the balanced equation above:
3 moles of oxygen are required to react with one mole of C2H4, therefore, to know the number of moles required to react with 1.95 moles of C2H4, all you have to do is cross multiplication as follows:
number of oxygen moles = (1.95*3) / 1 = 5.85 moles

5.862 moles of O₂

Further explanation

Given:

Combustion of 54.7 g of C₂H₄ to form CO₂ and H₂O.

Question:

How many moles of O₂ are required for the complete reaction of combustion of C₂H₄?

The Process:

Relative atomic mass: C = 12 and H = 1.Relative molecular mass (Mr) of C₂H₄ = 2(12) + 4(1) = 28.

Let us convert mass to mole for C₂H₄.

[tex]\boxed{ \ n = \frac{mass}{Mr} \ } \rightarrow \boxed{ \ n = \frac{54.7}{28} = 1.954 \ moles \ }[/tex]

The combustion reaction of  C₂H₄ (ethylene, also named ethene) can be expressed as follows:

[tex]\boxed{ \ C_2H_4 + 3O_2 \rightarrow 2CO_2 + 2H_2O \ }[/tex] (the reaction is balanced)

According to chemical equation above, proportion between C₂H₄ and O₂ is 1 to 3. Therefore, we can count the number of moles of O₂.

[tex]\boxed{ \ \frac{n(O_2)}{n(C_2H_4)} = \frac{3}{1} \ }[/tex]

[tex]\boxed{ \ n(O_2) = \frac{3}{1} \times n(C_2H_4) \ }[/tex]

[tex]\boxed{ \ n(O_2) = \frac{3}{1} \times 1.954 \ moles \ }[/tex]

Thus, the number of moles of O are required for the complete reaction of the combustion of C₂H₄ is 5.862 moles.

_ _ _ _ _ _ _ _ _

Notes:

If we want to calculate the mass of O₂, then we use the number of moles of O₂ that have been obtained.

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The molecule hydrogen fluoride (HF) contains a polar bond H - F, where fluorine is more electronegitivexpensive than Hydrogen. Which is the appropriate representation of the H - F bond?

Answers

Hydrogen's one electron will see that fluoride has seven electrons on its valence shell and will want to fill that eight slot to create the more stable compound Hydrogen fluoride. The flouride atom will have eight electrons orbiting its valence shell while hydrogen will have two electrons.

How many milliliters of 0.150 m h2so4 are required to react with 2.05 g of sodium hydrogen cabronate?

Answers

25 milliters are required

Ne(g) effuses at a rate that is ______ times that of xe(g) under the same conditions.

Answers

Ne (g) effuses at a rate that is [tex]\boxed{{\text{2}}{\text{.6}}}[/tex] times that of Xe (g) under the same conditions.

Further Explanation:

Graham’s law of effusion:

Effusion is the process by which molecules of gas travel through a small hole from high pressure to the low pressure. According to Graham’s law, the effusion rate of a gas is inversely proportional to the square root of the molar mass of gas.

The expression for Graham’s law is as follows:

[tex]\boxed{{\text{R}}\propto\dfrac{1}{{\sqrt {{\mu }} }}}[/tex]

Here,

R is the rate of effusion of gas.

[tex]{{\mu }}[/tex] is the molar mass of gas.

Higher the molar mass of the gas, smaller will be the rate of effusion and vice-versa.

The rate of effusion of Ne is expressed as follows:

[tex]{{\text{R}}_{{\text{Ne}}}} \propto \dfrac{1}{{\sqrt {{{{\mu }}_{{\text{Ne}}}}} }}[/tex]

                                                 ......(1)

Here,

[tex]{{\text{R}}_{{\text{Ne}}}}[/tex] is the rate of effusion of Ne.

[tex]{{{\mu }}_{{\text{Ne}}}}[/tex] is the molar mass of Ne.

The rate of effusion of Xe is expressed as follows:

[tex]{{\text{R}}_{{\text{Xe}}}}\propto\dfrac{1}{{\sqrt{{{{\mu }}_{{\text{Xe}}}}}}}[/tex]

                                     ......(2)

Here,

[tex]{{\text{R}}_{{\text{Xe}}}}[/tex] is the rate of effusion of Xe.

[tex]{{{\mu }}_{{\text{Xe}}}}[/tex] is the molar mass of Xe.

On dividing equation (1) by equation (2),

[tex]\dfrac{{{{\text{R}}_{{\text{Ne}}}}}}{{{{\text{R}}_{{\text{Xe}}}}}}=\sqrt {\dfrac{{{{{\mu }}_{{\text{Xe}}}}}}{{{{{\mu }}_{{\text{Ne}}}}}}}[/tex]     ......(3)

Rearrange equation (3) to calculate  [tex]{{\text{R}}_{{\text{Ne}}}}[/tex].

[tex]{{\text{R}}_{{\text{Ne}}}}=\left( {\sqrt {\dfrac{{{{{\mu }}_{{\text{Xe}}}}}}{{{{{\mu }}_{{\text{Ne}}}}}}} } \right){{\text{R}}_{{\text{Xe}}}}[/tex]     ......(4)

The molar mass of Ne is 20.17 g/mol.

The molar mass of Xe is 131.29 g/mol.

Substitute these values in equation (4).

[tex]\begin{aligned}{{\text{R}}_{{\text{Ne}}}}&= \left({\sqrt {\frac{{{\text{131}}{\text{.29}}}}{{{\text{20}}{\text{.17}}}}} } \right){{\text{R}}_{{\text{Xe}}}}\\&= \left( {\sqrt {6.50917} } \right){{\text{R}}_{{\text{Xe}}}}\\&= 2.5513{{\text{R}}_{{\text{Xe}}}}\\&\approx 2.6{{\text{R}}_{{\text{Xe}}}}\\\end{aligned}[/tex]

Therefore the rate of effusion of Ne is 2.6 times the rate of effusion of Xe.

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Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Ideal gas equation

Keywords: Effusion, rate of effusion, molar mass, Ne, Xe, 2.6 times, Graham’s law, inversely proportional, square root.

Final answer:

Neon effuses faster than xenon due to its lighter molar mass, and the effusion rate for neon will be larger than that for xenon, resulting in a smaller effusion time for neon.

Explanation:

The student's question pertains to the comparison of the effusion rates of neon (Ne) and xenon (Xe) gases under the same conditions. The effusion rate of a gas is inversely proportional to the square root of its molar mass, according to Graham's law of effusion. Given that neon is lighter than xenon, it will effuse at a faster rate. Using the provided effusion time calculations, if it takes 243 seconds for xenon to effuse, then by solving for the time it would take for the same amount of neon to effuse using the ratio of the square roots of their molar masses, we determine the time for neon to be approximately 95.3 seconds.

This result is expected because the lighter a gas is, the faster it should effuse, making the effusion rate for neon larger than that for xenon, and consequently, the time for effusion is smaller for neon than xenon as presented in the example calculation.

How many calcium ions are in 0.3 mol of cacl2?

Answers

One mole of CaCl2 contains 1 mole of calcium.
Therefore, 0.3 moles of CaCl2 will contain 0.3 moles of calcium.

1 mole of calcium contains Avogadro's number of ions, therefore, 0.3 moles will contain:
number of ions = 0.3 * 6.02 * 10^23 = 1.806 * 10^23 ions
1.8 x 10^23 calcium ions Each mole of CaCl2 will produce 1 mole of calcium ions. So just multiply the number of moles of CaCl2 by avogadro's number. Therefore 0.3 * 6.0221409 x 10^23 = 1.806642 x 10^23 So there will be 1.8 x 10^23 calcium ions in 0.3 moles of CaCl2.

After reviewing your answers to questions 2 and 4 above, would you define boiling point and melting point as a periodic table family trend (vertical groups), period trend (horizontal rows), or neither? Explain your answer

Answers

Neither, boiling and melting point per element varies from element to element on the periodic table. Family trends and period trends determine what kind of element each aspect is. 

Notice that "po4" appears in two different places in this chemical equation. po 3−4 is a polyatomic ion called phosphate . what number should be placed in front of na3po4 to give the same total number of phosphate ions on each side of the equation? ?na3po4+mgcl2→mg3(po4)2+nacl

Answers

Answer: "2" should be placed infront of [tex]Na_3PO_4[/tex] to have the same number of phosphate ions on each side.

Explanation: For a given reaction in the question,

The phosphate ions on product side are 2, so there should be 2 phosphate atoms on the reactant side as well.

And the number of Magnesium atoms on product side is 3, there should be 3 magnesium atoms on the reactant side as well.

To balance out Phosphate and magnesium atoms, 6 sodium and chlorine atoms each are formed on reactant side, so to balance these atoms, 6 atoms of each should be present on product side.

Now, the balanced Chemical equation becomes:

[tex]2Na_3PO_4+3MgCl_2\rightarrow Mg_3(PO_4)_2+6NaCl[/tex]

By placing the coefficient '2' in front of Na3PO4 in the given chemical equation, we can ensure that the same number of phosphate ions are present on both sides of the equation.

In the given chemical equation, we see PO4 appearing twice: once in Na3PO4 and again in Mg3(PO4)2 on the other side of the equation. It's crucial to balance this equation so that the same number of phosphate ions are present on both sides. Each Mg3(PO4)2 molecule contains two phosphate ions (PO4 units), which means if we have one Mg3(PO4)2 on the right side of the equation, we need two PO4 units on the left side as well.

To achieve this, place the coefficient '2' in front of Na3PO4, which dictates that we have two Na3PO4 molecules (each containing one PO4 unit) allowing us to have two phosphate ions on the left. Hence, the balanced chemical equation will look like: 2Na3PO4 + MgCl2 → Mg3(PO4)2 + NaCl.

Learn more about Chemical Equation Balancing here:

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Considering light at the two ends of the visible light spectrum, violet light has a _____ wavelength and a _____ photon energy than red light.

Answers

Violet light has a shorter wavelength and greater amount of photon energy than red light. A short wavelength correlates to a higher energy. Of the wavelengths humans can see, violet waves have the shortest wavelength and therefore also have the most energy.

Final answer:

Violet light has a shorter wavelength and higher photon energy compared to red light, with violet having the shortest wavelengths and red the longest within the visible spectrum.

Explanation:

Considering light at the two ends of the visible light spectrum, violet light has a shorter wavelength and a higher photon energy than red light. In the visible light spectrum, violet light has the shortest wavelengths (approximately 400 nm) and thus carries the most energy. Conversely, red light has the longest wavelengths (approximately 700 nm) and carries the least amount of energy.

Sunlight, for example, which is blackbody radiation, peaks in the visible spectrum and has more intensity in the red than in the violet, giving the sun a yellowish appearance. The high energy of violet photons is why dyes that absorb violet light fade more quickly, and when you observe faded posters, the blues and violets are the last to fade.

Write the balanced molecular and net ionic equations for the reaction between aluminum metal and silver nitrate. identify the oxidation and reduction half-reactions.

Answers

The balanced molecular equation is [tex]\boxed{{\text{Al}}\left(s\right)+3{\text{AgN}}{{\text{O}}_3}\left({aq}\right)\to {\text{Al}}{{\left({{\text{N}}{{\text{O}}_{\text{3}}}}\right)}_3}\left({aq}\right)+3{\text{Ag}}\left(s\right)}[/tex]

The balanced net ionic equation is [tex]\boxed{{\text{Al}}\left( s\right)+3{\text{A}}{{\text{g}}^+}\left({aq}\right)\to{\text{A}}{{\text{l}}^{3+}}\left({aq}\right)+3{\text{Ag}}\left(s\right)}[/tex]

The reduction half-cell reaction is [tex]\boxed{{\text{Ag}}+{e^-}\to{\text{Ag}}}[/tex]

The oxidation half-cell reaction is [tex]\boxed{{\text{Al}}\to{\text{A}}{{\text{l}}^{3+}}+3{e^-}}[/tex]

Further Explanation:

The three types of equations that are used to represent the chemical reaction are as follows:

1. Molecular equation

2. Total ionic equation

3. Net ionic equation

The reactants and products remain in undissociated form in the molecular equation. In the case of total ionic equation, all the ions that are dissociated and present in the reaction mixture are represented while in the case of overall or net ionic equation only the useful ions that participate in the reaction are represented.

The steps to write the molecular equation and net ionic reaction are as follows:

Step 1: Write the molecular equation for the reaction with the phases in the bracket.

In the reaction,1 mole of Al reacts with 3 moles of [tex]{\text{AgN}}{{\text{O}}_3}[/tex] to form 1 mole of [tex]{\text{Al}}{\left( {{\text{N}}{{\text{O}}_3}} \right)_3}[/tex] and 3 moles of Ag. The balanced molecular equation of the reaction is as follows:

 [tex]{\text{Al}}\left(s\right)+3{\text{AgN}}{{\text{O}}_3}\left( {aq}\right)\to{\text{Al}}{\left( {{\text{N}}{{\text{O}}_{\text{3}}}}\right)_3}\left({aq}\right)+3{\text{Ag}}\left(s\right)[/tex]

Step2: Dissociate all the compounds with the aqueous phase to write the total ionic equation. The compounds with solid and liquid phases remain same. The total ionic equation is as follows:

 [tex]{\text{Al}}\left(s\right)+3{\text{A}}{{\text{g}}^+}\left({aq}\right)+{\text{NO}}_3^-\left( {aq}\right)\to{\text{A}}{{\text{l}}^{3+}}\left({aq}\right)+{\text{NO}}_3^-\left({aq}\right)+3{\text{Ag}}\left(s\right)[/tex]

Step3. The common ions on both sides of the reaction get cancelled out to get the net ionic equation.

[tex]{\text{Al}}\left(s\right)+3{\text{A}}{{\text{g}}^+}\left({aq}\right)+\boxed{{\text{NO}}_3^-\left({aq}\right)}\to{\text{A}}{{\text{l}}^{3+}}\left({aq}\right)+\boxed{{\text{NO}}_3^ - \left({aq}\right)}+3{\text{Ag}}\left(s\right)[/tex]

Therefore, the net ionic equation is as follows:

[tex]{\text{Al}}\left(s\right)+3{\text{A}}{{\text{g}}^+}\left({aq}\right)\to{\text{A}}{{\text{l}}^{3 + }}\left({aq}\right)+3{\text{Ag}}\left(s\right)[/tex]

Redox reaction:

It is a type of chemical reaction in which the oxidation states of atoms are changed. In this reaction, both reduction and oxidation are carried out at the same time. Such reactions are characterized by the transfer of electrons between the species involved in the reaction.

The process of gain of electrons or the decrease in the oxidation state of the atom is called reduction while that of loss of electrons or the increase in the oxidation number is known as oxidation. In redox reactions, one species lose electrons and the other species gain electrons. The species that lose electrons and itself gets oxidized is called as a reductant or reducing agent. The species that gains electrons and gets reduced is known as an oxidant or oxidizing agent. The presence of a redox pair or redox couple is a must for the redox reaction.

The general representation of a redox reaction is,

[tex]{\text{X}}+{\text{Y}}\to{{\text{X}}^+}+{{\text{Y}}^-}[/tex]

The oxidation half-reaction can be written as:

[tex]{\text{X}}\to{{\text{X}}^+}+{e^-}[/tex]

The reduction half-reaction can be written as:

[tex]{\text{Y}}+{e^-}\to{{\text{Y}}^-}[/tex]

Here, X is getting oxidized and its oxidation state changes from  to +1 whereas B is getting reduced and its oxidation state changes from 0 to -1. Hence, X acts as the reducing agent whereas Y is an oxidizing agent.

Ag in silver nitrate forms solid silver during the reaction so it is getting reduced. The reduction half-cell reaction is as follows:

[tex]{\text{Ag}}+{e^-}\to{\text{Ag}}[/tex]

Aluminium gets converted to [tex]{\text{A}}{{\text{l}}^{3+}}[/tex] by oxidizing itself. The oxidation half-cell reaction is as follows:

[tex]{\text{Al}}\to{\text{A}}{{\text{l}}^{3+}}+3{e^-}[/tex]

Learn more:

1. Balanced chemical equation: https://brainly.com/question/1405182

2. Oxidation and reduction reaction: https://brainly.com/question/2973661

Answer details:

Grade: High School

Subject: Chemistry

Chapter: Chemical reaction and equation

Keywords: net ionic equation, Ag, Al, NO3-, Al3+, e-, Ag+, redox, oxidizing, reducing, oxidation half-cell reaction, reduction half-cell reaction, molecular equation, AgNO3, Al(NO3)3.


The term sink refers to _____.

Answers

I believe the options are
 A. fossil fuels such as coal, oil, and gas
B. a location for carbon dioxide storage
C. the origination point of a gas, such as a volcano
D. the origination point of a gas, such as the atmosphere

If those are the options then the answer is B. A location of Carbon storage such as Fossil fuels, coal oil gas etc is referred to as a sink
Answer is B :) hope this was helpful

One gram-mole of methyl chloride vapor is contained in a vessel at 100 c and 10 atm. use the ideal gas equation of state to estimate the system volume

Answers

The ideal gas equation is expressed as,

     PV = nRT

where P is the pressure,
           V is the volume,
           n is the number of moles,
           R is the universal gas constant, and
           T is temperature

From this, we get the expression for V.
    
     V = nRT/P

Substituting the known values,
  
   V = (1 mol)(0.0821 L.atm/mol K)(100 C + 273.15) / 10 atm
    V = 3 L

ANSWER: 3L

The system volume of 1 gram-mole of methyl chloride vapor at 100°C and 10 atm is approximately 3.06 liters.

To estimate the system volume of 1 gram-mole of methyl chloride vapor under given conditions, we use the Ideal Gas Law equation:

PV = nRT

Here, P is the pressure in atm, V is the volume in liters, n is the number of moles, R is the universal gas constant (0.0821 L·atm/(mol·K)), and T is the temperature in Kelvin.

Given:

Pressure (P) = 10 atmNumber of moles (n) = 1 molTemperature (T) = 100 °C = 100 + 273.15 = 373.15 K

Using the equation, we solve for V:

V = (nRT)/P

Substituting the values, we get:

[tex]V = \frac{(1 \, \text{mol} \times 0.0821 \, \text{L} \cdot \text{atm} / (\text{mol} \cdot \text{K}) \times 373.15 \, \text{K})}{10 \, \text{atm}}[/tex]

[tex]V = \frac{(1 \times 0.0821 \times 373.15) \, \text{L} \cdot \text{atm} / \text{K}}{10 \, \text{atm}}[/tex]

[tex]V = \frac{30.634115 \, \text{L} \cdot \text{atm}}{10 \, \text{atm}}[/tex]

[tex]V = 3.0634115 \, \text{L}[/tex]

V ≈ 3.06 L

So, the system volume is approximately 3.06 liters.

Bismuth oxide reacts with carbon to form bismuth metal: bi2o3(s) + 3c(s) → 2bi(s) + 3co(g) when 689 g of bi2o3 reacts with excess carbon, (a) how many moles of bi form? 2.957 mol bi (b) how many grams of co form? g co

Answers

Using the answer from the first part, we know that 2.957 moles of bismuth have formed. Moreover, the molar ratio between bismuth and carbon monoxide is:

2 : 3

Using the method of ratios,

2 : 3
2.957 : CO

CO = (3 * 2.957) / 2
CO = 4.4355

4.436 moles of carbon monoxide will be formed

CO mass = 4,435. 18 = 79,839 grams

Stokiometry in Chemistry learns about chemical reactions mainly emphasizing quantitative, such as calculation of volume, mass, number, which is related to the number of ions, molecules, elements etc.

In chemical calculations, the reaction can be determined, the number of substances that can be expressed in units of mass, volume, mole, or determine a chemical formula, for example the substance level or molecular formula of hydrate.

In stockiometry therein includes

relative atomic mass (Ar) and relative molecular mass (Mr)

Mr. AxBy = (x.Ar A + y. Ar B)

Reactions that occur:

Bi₂O₃ (s) + 3C (s) → 2Bi (s) + 3CO (g)

We specify mole Bi₂O₃

Mr Bi₂O₃ = 2. ar bi + 3. Ar O

Mr Bi₂O₃ = 2. 209 + 3. 16

Mr. Bi₂O₃= 466

mole Bi₂O₃ = gram / Mr

mole = 689/466

mole 1.4785

A. Comparison of Bi reaction coefficients: Bi₂O₃ = 1: 2, then Bi moles = 2. 1,4785 = 2, 957

Comparison of Bi reaction coefficients:  Bi₂O₃  = 1: 2,

B. While the number of moles CO = 3 x 1.4785 = 4,435

Mr. CO = 12 + 16 = 18

mass CO = mole. Mr

CO mass = 4,435. 18 = 79,839 grams

Learn more

how many moles of water you can produce

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Excess reactant

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The percentage yield

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Limiting reactant

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The acceleration due to gravity on the surface of Mars is about one third the acceleration due to gravity on Earth’s surface. The weight of a space probe on the surface of Mars is about

Answers

Ok. I finally understood that you need to complete (fill in the blank) the last sentence: The weight of a space probe on the surface of Mars is about ______________

The answer is one third its weight on the surface of Earth.

You can find that by using the formula for the weight:

weight =  mass * acceleration due to gravity

So, given that the mass is constant and the acceleration due to gravity is one third, the weight is also one third.








Final answer:

On Mars, the acceleration due to gravity is about one-third of that on Earth, which means an object weighs significantly less on Mars compared to its weight on Earth.

Explanation:

The question pertains to the acceleration due to gravity on the surface of Mars compared to Earth. On Mars, the acceleration due to gravity is about one-third of that on Earth. Specifically, the gravitational acceleration on Mars is approximately 3.71 m/s², while on Earth, it is about 9.81 m/s². Thus, an object on Mars weighs significantly less than it does on Earth. For example, if a space probe weighs 100 pounds on Earth, on Mars, it would weigh roughly 38 pounds because the acceleration due to gravity on Mars is 0.38 that of Earth's gravity. This difference significantly impacts how objects move and respond to forces on Mars compared to Earth.

Complete combustion of 7.40 g of a hydrocarbon produced 22.4 g of CO2 and 11.5 g of H2O. What is the empirical formula for the hydrocarbon?

Show work please?

Answers

C2H5 First, you need to figure out the relative ratios of moles of carbon and hydrogen. You do this by first looking up the atomic weight of carbon, hydrogen, and oxygen. Then you use those atomic weights to calculate the molar masses of H2O and CO2. Carbon = 12.0107 Hydrogen = 1.00794 Oxygen = 15.999 Molar mass of H2O = 2 * 1.00794 + 15.999 = 18.01488 Molar mass of CO2 = 12.0107 + 2 * 15.999 = 44.0087 Now using the calculated molar masses, determine how many moles of each product was generated. You do this by dividing the given mass by the molar mass. moles H2O = 11.5 g / 18.01488 g/mole = 0.638361 moles moles CO2 = 22.4 g / 44.0087 g/mole = 0.50899 moles The number of moles of carbon is the same as the number of moles of CO2 since there's just 1 carbon atom per CO2 molecule. Since there's 2 hydrogen atoms per molecule of H2O, you need to multiply the number of moles of H2O by 2 to get the number of moles of hydrogen. moles C = 0.50899 moles H = 0.638361 * 2 = 1.276722 We can double check our math by multiplying the calculated number of moles of carbon and hydrogen by their respective atomic weights and see if we get the original mass of the hydrocarbon. total mass = 0.50899 * 12.0107 + 1.276722 * 1.00794 = 7.400185 7.400185 is more than close enough to 7.40 given rounding errors, so the double check worked. Now to find the empirical formula we need to find a ratio of small integers that comes close to the ratio of moles of carbon and hydrogen. 0.50899 / 1.276722 = 0.398669 0.398669 is extremely close to 4/10, so let's reduce that ratio by dividing both top and bottom by 2 giving 2/5. Since the number of moles of carbon was on top, that ratio implies that the empirical formula for this unknown hydrocarbon is C2H5

What types of scientific field quantities are there

Answers

212 is ok t=rightlolop;;


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