Elements in the same group/family of the periodic table are similar in what way?
Answer:
they have the same valance electrons
Explanation:
Which radioactive isotope is commonly used to date wooden artifacts?
Describe how you could determine the specific heat of a sample of a solid substance. You may assume that the substance does not react with water. In your answer, make sure to include a description of what equipment you would use and how you would interpret the data you collected.
Answer:
I would use calorimetry to determine the specific heat.
I would measure the mass of a sample of the substance.
I would heat the substance to a known temperature.
I would place the heated substance into a coffee-cup calorimeter containing a known mass of water with a known initial temperature. I would wait for the temperature to equilibrate, then calculate temperature change. I would use the temperature change of water to determine the amount of energy absorbed. I would use the amount of energy lost by substance, mass, and temperature change to calculate specific heat.
Explanation:
Answer on Edg 21'
You're writing the instruction manual for a power saw, and you have to specify the maximum permissible length for an extension cord made from 18-gauge copper wire (diameter 1.0 mm). the saw draws 9.0 a and needs a minimum of 115 v across its motor when the outlet supplies 120 v.
Final answer:
To find the maximum permissible length for an 18-gauge extension cord for use with a power saw, one must calculate the voltage drop the cord can tolerate (5 V) and use the ohmic resistance per length unit of an 18-gauge wire to maintain at least 115 V for the saw's operation. This involves applying Ohm's Law and wire resistance specifications.
Explanation:
Finding the Maximum Permissible Length for an 18-Gauge Extension Cord:
To determine the maximum permissible length for an 18-gauge (1.0 mm diameter) copper wire extension cord for a power saw that draws 9.0 A and requires a minimum of 115 V to operate efficiently when the outlet supplies 120 V, we need to calculate the allowable voltage drop and then translate that into a length given the specific characteristics of the wire.
Voltage Drop Calculation:
The power saw can tolerate a voltage drop of 5 V (from 120 V to 115 V). Using Ohm's Law (V = IR), where V is the voltage, I is the current, and R is the resistance, we can determine the maximum resistance of the cord allowed to ensure the voltage at the saw does not drop below 115 V. First, we calculate the maximum allowable voltage drop per meter (or foot) of wire using the resistance per length unit for an 18-gauge copper wire.
Since an 18-gauge wire has specific resistance (often found in tables or the manufacturer's specifications), that value can be applied to determine how the calculated voltage drop correlates to a length. For example, if the resistance of an 18-gauge copper wire is 6.385 ohms per kilometer (0.006385 ohms per meter), and the power saw draws 9.0 A, the maximum permissible voltage drop of 5 V could be distributed across a specific length of wire without exceeding the minimum requirement of 115 V at the tool.
Conclusion:
Using the calculated resistance, the homeowner or electrician can then calculate the exact permissible length, ensuring the power saw operates within safe electrical parameters. It's essential to consult up-to-date tables for wire resistance to ensure accuracy.
Suppose a lab group reports a percent yield of sand of 105%. Is it really possible to collect more sand than was originally present? What is a possible explanation for the “extra” product? Do not consider calculation mistakes; think about the procedure used.
Barium sulfate is a compound used to assist in diagnosing medical problems through x-ray analysis and is 58.8% barium. what mass of barium is present in a 620 mg tablet of barium sulfate?
Final answer:
To find the mass of barium in a 620 mg tablet of barium sulfate, multiply the tablet's mass by the percentage of barium (58.8%). The calculation yields approximately 364.56 mg of barium in the tablet.
Explanation:
The question is asking to calculate the mass of barium present in a 620 mg tablet of barium sulfate, a compound known for its use in medical imaging. Given that barium sulfate is 58.8% barium by mass, we can calculate the mass of barium in the tablet by multiplying the total mass of the tablet by the percentage of barium.
To find the amount of barium, we use the following calculation:
Mass of barium = (mass of barium sulfate tablet) x (percentage of barium) / 100%
Mass of barium = (620 mg) x (58.8%) / 100
Mass of barium = 620 mg x 0.588
Mass of barium ≈ 364.56 mg
Therefore, a 620 mg tablet of barium sulfate contains approximately 364.56 mg of barium.
According to the lewis definition, a base is a(n):
a. proton donor.
b. hydroxide ion donor.
c. hydrogen ion donor.
d. electron pair donor.
e. electron pair acceptor.
The molecular formula of a compound is always ________ the empirical formula. the molecular formula of a compound is always ________ the empirical formula. the same as simpler than an integral multiple of more complex than different from
Answer:
A whole number.
Explanation:
Hello,
Empirical formula is the smallest representation of a chemical formula and the molecular formula is the actual formula of a given compound. For instance, glucose has the following molecular formula:
[tex]C_6H_{12}O_6[/tex]
But its empirical formula is:
[tex]CH_2O[/tex]
So they are relation by the 6 as a whole number.
Best regards.
List at least one reason for not touching the magnesium metal with bare hands. 3. list two reasons for using crucible tongs to handle the crucible and lid after their initial firing in the experimental procedure.
Crucible tongs are mandatory to handle hot crucibles to avoid skin burns and accidents during experimental procedures. Crucible tongs work with the crucible; their shape was designed to firmly hold it to avoid spills.
Touching the magnesium metal can actually contaminate it and bring with it impurities which may not be removed by heating. So this leads to error in weighing.
There are two reasons not to touch the crucible tong with bare hands:
1. The crucible tong is used during firing so it is extremely hot and may burn your hands
2. Any impurities in your hand may contaminate the tong hence leading to error just like the case for the magnesium metal
If 2.32 g of ethanol reacts with 10.6 g of oxygen, how many moles of water are produced?
What is the ph of
a.35 m solution of sodium azide? the ka value for hydrazoic acid is 1.9?
Given the Ka value for hydrazoic acid and the concentration of sodium azide, calculating the precise pH would typically involve understanding the dissociation degree or specific details about the ionization in the solution to apply the proper formulas. Without complete data, an exact pH calculation isn't directly attainable.
Explanation:The question asks about the pH of a 0.35 M solution of sodium azide. Sodium azide (NaN3) dissociates in water to produce azide ions (N3-) and sodium ions (Na+). The azide ions then react with water to generate hydrazoic acid (HN3) and hydroxide ions (OH-), which affects the pH of the solution.
Given the Ka (acid dissociation constant) value for hydrazoic acid (HN3) is 1.9, and the concentration of sodium azide is 0.35 M, we can calculate the pH by first determining the pKa using the formula pKa = -log(Ka), then using the Henderson-Hasselbalch equation to find the pH, which is used for buffer solutions or weak acid/conjugate base systems.
However, since the concentration of sodium azide is directly given and it's a base forming solution, direct use of the pKa and Ka values without the concentrations of the conjugate pairs in a specific equation elucidating hydroxide ion concentration followed by pH calculation might be needed. Yet, a complete calculation would require the dissociation degree or further specific context about the system to accurately determine the pH, which isn't directly provided.
Under which class of substitution reaction does this reaction appear to fall
This reaction is most likely to fall under SN2 because the thing called carbonication does not occur in SN1. The carbon forms a partial bond with the nucleophile during the intermediate phase and the leaving group. So for this question the reaction will fall under SN2.
Substitution reactions are characterized by the replacement of one or more hydrogen atoms in an alkane with different atoms or groups, without breaking carbon-carbon bonds. These reactions can demonstrate first order behavior and can also be involved in the process of preparing insoluble salts from soluble ones.
The subject of this discussion is a type of chemical reaction known as a substitution reaction. In this type of reaction, one or more of an alkane's hydrogen atoms are replaced by a differing atom or group of atoms, without altering any carbon-carbon bonds. An example of this can be found in the reaction between ethane and molecular chlorine.
The stoichiometry of a homogeneous reaction like this outlines the rates for the consumption of reactants and the formation of products. This process could potentially represent a unimolecular elementary reaction. Interestingly, the rate law derived from this compares to the rate law derived experimentally for the overall reaction, which exhibits first-order behavior.
Substitution reactions can also involve soluble salts to prepare insoluble salts. An example of this is seen with the covalent oxides of the transition elements reacting with hydroxides to form salts containing oxyanions of the transition elements.
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How many molecules of n2 are in a 300.0 ml container at 780 mmhg and 135°c?
To solve for the number of molecules, we need to first find the number of moles. Assuming ideal gas, we use the formula:
n = PV / RT
where P is pressure = 780 mmHg, V is volume = 300 mL = 0.3 L, T is temperature = 135°C = 408.15 K, R is gas constant = 62.36367 L mmHg / mol K
n = (780 mmHg) (0.3 L) / (62.36367 L mmHg / mol K) (408.15 K)
n = 9.19 x 10^-3 mol
Using Avogadros number, we calculate the number of molecules.
molecules = 9.19 x 10^-3 mol * 6.022 x 10^23 molecules / mol
molecules = 5.54 x 10^21 molecules
[tex]\boxed{{5{.4 \times 1}}{{\text{0}}^{{\text{21}}}}\;{\text{molecules}}}[/tex] of nitrogen are present in a 300 mL container at 780 mm Hg and [tex]135\;^\circ{\text{C}}[/tex].
Further Explanation:
An ideal gas contains a large number of randomly moving particles that are supposed to have perfectly elastic collisions among themselves. It is just a theoretical concept and practically no such gas exists. But gases tend to behave almost ideally at a higher temperature and lower pressure.
Ideal gas law is considered as the equation of state for any hypothetical gas. Here, we assume nitrogen to be an ideal gas. So the expression for the ideal gas equation of nitrogen is as follows:
[tex]{\text{PV}} = {\text{nRT}}[/tex] ......(1)
Here, P is the pressure of nitrogen.
V is the volume of nitrogen.
T is the absolute temperature of nitrogen.
n is the number of moles of nitrogen.
R is the universal gas constant.
Rearrange equation (1) to calculate the number of moles of nitrogen.
[tex]{\text{n}} = \frac{{{\text{PV}}}}{{{\text{RT}}}}[/tex] ......(2)
Firstly, the temperature is to be converted into K. The conversion factor for this is,
[tex]{\text{0 }}^\circ {\text{C}} = {\text{273 K}}[/tex]
So the temperature of nitrogen is calculated as follows:
[tex]\begin{aligned}{\text{Temperature}}\left( {\text{K}}\right)&=\left({135 + 273} \right)\;{\text{K}}\\&=408\;{\text{K}}\\\end{aligned}[/tex]
Also, the volume is to be converted into L. The conversion factor for this is,
[tex]{\text{1 mL}}={\text{1}}{{\text{0}}^{ - 3}}{\text{ L}}[/tex]
So the volume of nitrogen is calculated as follows:
[tex]\begin{aligned}{\text{Volume}}\left({\text{L}}\right)&=\left({{\text{300 mL}}} \right)\left({\frac{{{{10}^{ - 3}}{\text{L}}}}{{{\text{1 mL}}}}}\right)\\&=0.3\;{\text{L}}\\\end{aligned}[/tex]
The pressure of nitrogen is 780 mm Hg.
The volume of nitrogen is 0.3 L.
The temperature of nitrogen is 408 K.
The universal gas constant is 62.36367 L mmHg/mol K.
Substitute these values in equation (2).
[tex]\begin{aligned}{\text{n}}&=\frac{{\left({{\text{780 mm Hg}}}\right)\left({{\text{0}}{\text{.3 L}}} \right)}}{{\left({{\text{62}}{\text{.3637 L mm Hg/K mol}}}\right)\left( {{\text{408 K}}}\right)}}\\&={\text{0}}{\text{.009196 mol}}\\&\approx {\text{0}}{\text{.009 mol}}\\\end{aligned}[/tex]
According to Avogadro law, one mole of any substance contains [tex]{\text{6}}{\text{.022}}\times{\text{1}}{{\text{0}}^{{\text{23}}}}[/tex] molecules.
So the number of molecules of nitrogen is calculated as follows:
[tex]\begin{aligned}\text{Number of molecules of nitrogen}&=\left(0.009\text{ mol}\right)\left(\dfrac{6.022\times 10^{23}\text{molecules}}{1\text{mol}}\right)\\&=5.4198\times 10^{21}\text{ molecules}\\&\bf \approx5.4\times 10^{21}\text{\bf molecules} \end{aligned}[/tex]
Learn more:
1. Which statement is true for Boyle’s law: https://brainly.com/question/1158880
2. Calculation of volume of gas: https://brainly.com/question/3636135
Answer details:
Grade: Senior School
Subject: Chemistry
Chapter: Ideal gas equation
Keywords: ideal gas, pressure, volume, absolute temperature, equation of state, hypothetical, universal gas constant, moles of nitrogen, 780 mm Hg, pressure of nitrogen, 780 mm Hg, volume of nitrogen, 0.3 L, temperature of nitrogen, 408 K, universal gas constant, 62.36367 L mmHg/mol K.
If the mass of a particular atom is exactly 5 times the mass of an atom of carbon-12, what is its mass
HNO3 Express your answers as ions separated by a comma.
What precautions must be taken when you introduce a mixture of compounds to be separated onto a liquid chromatography column?
Precautions must be considered when introducing a mixture of compounds onto a liquid chromatography column to ensure accurate separation.
Explanation:When introducing a mixture of compounds onto a liquid chromatography column, there are several precautions that must be taken to ensure accurate separation. First, the sample should be introduced as a narrow band at the top of the column. This helps to maintain the initial concentration profile and prevent broadening of the bands. Second, the solvents used in the mobile phase should be compatible with the stationary phase and solutes to avoid any interactions that could affect separation. Finally, the column should be equilibrated with the mobile phase before introducing the sample to ensure consistent separation.
if 4.1 L of gas at 22 degrees celsius is heated to 52 degrees celsius, what would the final volume be?
which statement best describes the properties of ionic compounds????
Show that the speed of an electron in the nth bohr orbit of hydrogen is αc/n, where α is the fine structure constant. what would be the speed in a hydrogen-like atom with a nuclear charge of ze?
Final answer:
The speed of an electron in the nth Bohr orbit of hydrogen is shown to be αc/n by equating the centripetal force to the Coulomb force. This principle extends to hydrogen-like atoms, where the speed becomes Zαc/n for a nucleus with charge Ze.
Explanation:
To demonstrate that the speed of an electron in the nth Bohr orbit of hydrogen is αc/n, where α is the fine structure constant, we start from the principle that the centripetal force required for an electron to move in a circular orbit is provided by the Coulomb force. For a hydrogen-like atom with a nucleus of charge Ze, the centripetal force is given by mev²/rn and the Coulomb force by k(Ze)(e)/rn². By setting these two forces equal, mev²/rn = k(Ze)(e)/rn², we can cancel rn and one charge e to find an expression for v, the electron speed.
To find the speed of an electron in a hydrogen-like atom with nuclear charge Ze, the same process is followed, but with Z = 1 replaced by the actual Z value. Noting that α = ke²/(hc) and rearranging the terms, we determine that the electron speed v = αc/n for a hydrogen atom (Z=1). For a hydrogen-like atom with a nuclear charge of Ze, the speed would be v = Zαc/n.
One year ago, you sold a put option on 100,000 euros with an expiration date of 1 year. you received a premium on the put option of $0.04 per unit. the exercise price was $1.22. assume that 1 year ago the spot rate of the euro was $1.20, the 1-year forward rate exhibited a discount of 2 percent, and the 1-year futures price was the same as the 1-year forward rate. from 1 year ago to today, the euro depreciated against the dollar by 4 percent. today the put option will be exercised (if it is feasible for the buyer to do so).
Name two animals that are omnivores. Give an example of a plant and an animal that each one might eat.
The structure of methyl acrylate is shown here. indicate the type of hybridization for each numbered atom.
The structure of methyl acrylate is
80 grams of iron (III) oxide and 54 grams of aluminum react to form an elemental iron and aluminum oxide. In the lab you only manage to get 75% yield.
a. How many grams of the non limiting reagent remains?
b. How many grams of the limiting reagent remains?
c. How many in grams of an elemental iron is formed?
. Which list is organized from smallest to largestA. Planet, Galaxy, Solar System, UniverseB. Solar System, Planet, Universe, GalaxyC. Universe, Solar System, Planet, GalaxyD. Planet, Solar System, Galaxy, Universe
Answer:
D
Explanation:
Planet, Solar System Galaxy and Universe
Refer to the first three rows of the periodic table, what element has properties most similar to carbon?
Why do elements that make positive ions occur on the left side of the periodic table while those that make negative ions occur on the right?
Please answer question #1
The temperature at which a liquid turns to a gas is called the boiling point.
If true write true.
If false change the word to make the statement true.
Which of these substances, when dissolved in water, is a strong electrolyte? which of these substances, when dissolved in water, is a strong electrolyte? sucrose folic acid sodium nitrate ammonia hydrofluoric acid?
Based on its products when it is dissolved in water, the substance that is a strong electrolyte is Sodium Nitrate.
Why is Sodium Nitrate a strong electrolyte?An electrolyte refers to a substance that has ions. When Sodium Nitrate is dissolved in water, it leads to Hydrochloric acid being formed.
Hydrochloric acid is a strong acid which means that it is full of ions. Sodium Nitrate can therefore be said to be a strong electrolyte.
In conclusion, option C is correct.
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What would be the shape of a molecule with triple bond?
A) bent
B) linear
C) pyramidal
D) tetrahedral
The triple bond is present in hydrocarbons alkyne.The shape of a molecule with triple bond is linear shape. Therefore, option B is correct.
What is triple bond ?The triple bond contain three covalent bond. A covalent bond of bond order is 3, it is consisting of six electrons. Therefore, one pair in a sigma bond and the other pairs in pi bonds present in it.
Alkynes are hydrocarbons in which carbon-carbon triple bonds are present. Their general formula is CnH2n-2 for molecules with one triple bond. Atoms form triple bonds with one another by sharing three pairs of electrons.
Triple-bonded carbons are sp-hybridized, and they have linear shapes. And its bond angle is 180° to each other.
Thus, The shape of a molecule with triple bond is linear shape, option B is correct.
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