Concentration of reactant mostly accelerates the rate of a reaction(at a higher concentration, reactants collide more often).
Explanation:
When there is more concentration of reactants then it means there are more number of molecules. Hence, then there will be more number of collisions taking place in the chemical reaction.
As a result, rate of reaction will increase with increase in concentration.
On the other hand, when there is decrease in concentration of reactants then it means less number of reactant molecules are taking part in the chemical reaction.
Hence, there will be less number of collisions between the molecules due to which there will be decrease in the rate of reaction.
How many copies of F2 are required to balance this chemical equation? N2 + __F2 = 2NF3 a) 3 b) 4 c) 5 d) 6
Answer: a) 3
On the right side of the equation you have 6F, so you need 3 copies of F2 to balance the equation.
Answer:
a) 3
Explanation:
The unbalanced combustion reaction is shown below as:-
[tex]N_2+F_2\rightarrow 2NF_3[/tex]
On the left hand side,
There are 2 nitrogen atoms and 2 fluorine atoms
On the right hand side,
There are 2 nitrogen atoms and 6 fluorine atoms
Nitrogen atoms are balanced and only fluorine atoms have to be balanced by applying a stoichiometric coefficient of 3 in from of [tex]F_2[/tex] in the reactant side.
Thus, the balanced reaction is:-
[tex]N_2+3F_2\rightarrow 2NF_3[/tex]
Coefficient in front of the [tex]F_2[/tex] in the balanced equation - 3
What is the volume in liters of 0.500 mol of c3h8 gas at stp
Answer:
11.21 L.
Explanation:
We can use the general law of ideal gas: PV = nRT.where, P is the pressure of the gas in atm (P = 1.0 atm, Standard P).
V is the volume of the gas in L (V = ??? L).
n is the no. of moles of the gas in mol (n = 0.5 mol).
R is the general gas constant (R = 0.0821 L.atm/mol.K),
T is the temperature of the gas in K (T = 273 K, Standard T).
∴ V = nRT/P = (0.5 mol)(0.0821 L.atm/mol.K)(273 K)/(1.0 atm) = 11.21 L.
if a 25.0 ml sample of sulfuric acid is titrated with 50.0 ml of 0.200 M potassium hydroxide to a phenolphthalein endpoint, what is the molarity of the acid?
A) 0.150 M
B) 0.100 M
C) 0.200 M
D) 0.300 M
E) 0.400 M
Final answer:
The molarity of sulfuric acid when titrated with potassium hydroxide, given the volumes and molarity of KOH used, is calculated to be 0.200 M, option C.
Explanation:
To find the molarity of sulfuric acid (H₂SO₄) when titrated with potassium hydroxide (KOH), we use the equation for the reaction:
H₂SO₄ (aq) + 2KOH(aq) → K₂SO₄ (aq) + 2H₂O (l)
Note that the stoichiometry requires 2 moles of KOH to neutralize 1 mole of H₂SO₄. Given that 50.0 mL of 0.200 M KOH is used, we can calculate the moles of KOH used:
Moles of KOH = volume (L) × molarity (M) = 0.050 L × 0.200 M = 0.0100 molesSince it takes 2 moles of KOH to neutralize 1 mole of H₂SO₄, the moles of H₂SO₄ neutralized will be half that of KOH used:
Moles of H₂SO₄ = 0.0100 moles KOH ÷ 2 = 0.00500 molesFinally, to find the molarity of H₂SO₄ in the 25.0 mL sample:
Molarity of H₂SO₄ = moles of acid ÷ volume of solution (L) = 0.00500 moles ÷ 0.025 L = 0.200 MTherefore, the molarity of the sulfuric acid is 0.200 M, which corresponds to option C.
What is the oxidation state for a mn atom?
The oxidation state of a Mn atom in its elemental state is zero. However, in compounds, Mn has multiple potential oxidation states depending on the number of electrons it has lost.
Explanation:The oxidation state of an atom is typically zero when it is in its elemental state. In the case of a manganese (Mn) atom, this rule applies: the manganese atom has an oxidation state of zero.
However, this can change under certain conditions. For instance, in a chemical reaction, the oxidation state of Mn can vary. Transition metals like Mn usually have multiple oxidation states due to their ability to lose different numbers of d or s orbital electrons.
For example, in a compound such as MnO2, the oxidation state of Mn is +4. Here, Mn has lost four electrons. In another compound such as Mn2+, Mn has lost two electrons, giving it an oxidation state of +2.
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Final answer:
The oxidation state of Mn in the permanganate ion (MnO₄) is +7. This is calculated using the known oxidation state of oxygen (-2) and balancing it with the overall charge of the permanganate ion (-1).
Explanation:
The oxidation state of manganese (Mn) varies depending on the compound it is in. For instance, in the permanganate ion (MnO₄), the oxidation state of Mn is determined using the known oxidation state of oxygen, which is -2. Since there are four oxygen atoms, their combined oxidation state is -8. The permanganate ion itself carries an overall charge of -1, so when adding up the oxidation states of all atoms in the ion, their sum must equal this charge.
The calculation is as follows: Mn + (-2) × 4 = -1, which simplifies to Mn - 8 = -1. Solving for Mn gives us an oxidation state of +7. Therefore, in MnO₄, manganese has an oxidation state of +7. This demonstrates that manganese can have a high oxidation state and act as a strong oxidizing agent.
In other compounds, such as MnO₂ or Mn₂O₇, Mn may have different oxidation states, such as +4 or +7, respectively. The principle is to always include the charge on the atom, and balance the oxidation states with the overall charge of the compound or ion.
You have a solution that is 18.5% (v/v) methyl alcohol. if the bottle contains 2.61 l of solution, what is the volume (v) in milliliters of methyl alcohol?
The answer is in the photo.
Consider the titration curve below
If an Erlenmeyer flask that is used in this titration contains 40.0 mL of 0.10 M HCl, how many moles of hydrogen ions are present at the point that is labeled A on the graph?
OPTION A) 0.0025
OPTION B) 0.0040
OPTION C) 40.0
OPTION D) 4000
i think A because .10 divided by 40 would be .0025
Answer:
0.0040
Explanation:
A 100-kg moving at 15 m/s collides with a 50-kg cart at rest causing both cars to move together in the same direction. If momentum is conserved, at what speed are the two carts now moving?
Answer:
30m/s
Explanation:
100 / 50 = 2 * 15 = 30m/s
Answer:
[tex]\boxed{\text{10 m/s}}[/tex]
Explanation:
Data:
Cart 1: m₁ = 100 kg; v =15 m/s
Cart 2: m₂ = 50 kg; v₂ = ?
Calculations:
I assume that the two carts are going at the same speed v₂ after the collision.
[tex]\begin{array}{rcl}\text{Momentum before collision} & = & \text{Momentum after collision} \\\text{100 kg} \times\text{15 m/s} & = &\text{100 kg} \times v_{2} + \text{50 kg} \times v_{2}\\\text{1500 m/s} & = & 100 v_{2} +50 v_{2}\\\text{1500 m/s} & = & 150 v_{2}\\v_{2}& =&\textbf{10 m/s}\\\end{array}\\\\\text{The two carts are now moving at a speed of }\boxed{\textbf{10 m/s}}[/tex]
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During an experiment, 95 grams of calcium carbonate reacted with an excess amount of hydrochloric acid. If the percent yield of the reaction was 82.15%, what was the actual amount of calcium chloride formed?
CaCO3 + HCl → CaCl2 + CO2 + H2O
A. 105.3 grams
B. 101.1 grams
C. 95.6 grams
D. 86.5 grams
Answer:
D. 86.5 grams
Explanation:
∵ The percentage yield = (actual yield/theoretical yield)*100.
We need to calculate the theoretical yield:
From the balanced reaction:
CaCO₃ + 2HCl → CaCl₂ + CO₂ + H₂O,
It is clear that 1 mol of CaCO₃ reacts with 2 mol of HCl to produce 1 mol of CaCl₂, 1 mol of CO₂, and 1 mol H₂O.
We need to calculate the no. of moles of 95.0 g CaCO₃:n = mass/molar mass = (95.0 g)/(100.0869 g/mol) = 0.95 mol.
Using cross multiplication:
1 mol of CaCO₃ produce → 1 mol of CaCl₂, from stichiometry.
∴ 0.95 mol of CaCO₃ produce → 0.95 mol of CaCl₂.
∴ The mass of CaCl₂ (theoretical yield) = (no. of moles) * (molar mass) = (0.95 mol)*(110.98 g/mol) = 105.34 g.
∵ The percentage yield = (actual yield/theoretical yield)*100.
The percentage yield = 82.15%, theoretical yield = 105.34 g.
∴ The actual yield of CaCl₂ = (The percentage yield)(theoretical yield)/100 = (82.15%)(105.34 g)/100 = 86.53 g ≅ 86.5 g.
So, the right choice is: D. 86.5 grams.Answer:
The correct answer is option D.
Explanation:
[tex]CaCO_3 + 2HCl \rightarrow CaCl_2 + CO_2 + H_2O[/tex]
Moles of calcium carbonate = [tex]\frac{95 g}{100.08 g/mol}=0.9492 mol[/tex]
According to reaction,1 mol of calcium carbonate gives 1 mol of calcium chloride.
Then 0.9492 mol of calcium carbonate will give :
[tex]\frac{1}{1}\times 0.9492 mol=0.9492 mol[/tex] of calcium chloride.
Theoretical yield of the calcium chloride = [tex]110.98 g/mol\times 0.9492 mol=105.3422 g[/tex]
Experimental yield of calcium chloride = 95 g
Percentage yield of a calcium chloride = 82.15 %
[tex]\frac{\text{experimental yield}}{\text{Theoretical yield}}\times 100=82.15\%[/tex]
[tex]\frac{\text{experimental yield}}{105.3422 g}\times 100=82.15\%[/tex]
Experimental yield = 86.53 g
The closest option to our answer is option D. Hence, option D is correct answer.
Any reaction that absorbs 150 kcal of energy can be classified as ________.
a. endothermic
b. exothermic
c. activated
d. reduction
e. oxidation
Answer:
a. endothermic
Explanation:
Endothermic reaction: is a chemical reaction that absorbs heat or energy through the reaction.While, exothermic reaction: is a chemical reaction that releases energy through light or heat. It is the opposite of an endothermic reaction.So, Any reaction that absorbs 150 kcal of energy can be classified as a. endothermic.
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What happens to the particles of a solid when the solid changes into a liquid?
A. They increase in size.
B. They decrease in size.
C. The attractive force between them increases.
D. The attractive force between them decreases.
Answer:
C
Explanation:
if you heat up a solid - you give it some energy. This causes the particles to move more and the solid to change into a liquid, or melt. If the liquid is heated then it may evaporate and turn into a gas. Taking energy away from a gas (cooling it down) may cause it to turn into a liquid - or condense.
Answer: D. The attractive force between them decreases.
Explanation:
Solid state : It is a state in which the particles are closely packed and does not have any space between them. They have strong intermolecular forces of attraction between them. This state has a definite shape and volume.
Liquid state : It is a state in which the particles are present in random and irregular pattern. The particles are closely arranged but they can move from one place to another.Theintermolecular forces are less as compared to the solids.This state has a definite volume but does not have a fixed shape.
Fusion process is a process where solid state changes to liquid state.The size of particles remain same but the attractive forces between them decrease, thus leading to a random motion of particles.
Elements occur in a number of isotopic forms. In this problem, you will learn about the notation used to distinguish different isotopes.How many protons Z and how many neutrons N are there in a nucleus of the most common isotope of silicon, 28/14Si?
Answer:
There are 14 protons (Z) and 14 neutrons (N) in a nucleus of the most common isotope of silicton.Explanation:
The notation of the most common isotope of silicon is:
[tex]^{28}_{14}Si[/tex]The superscript, 28, to the left of the chemical symbol, Si, is the mass number, usually identified with the symbol A, and it is the sum of the protons and neutrons.
The subscript, 14, to the left of the chemical symbolr, Si, is the atomic number, Z, which is the number of protons.
Then, you have this equation:
mass number = number of protons + neutrons, or, in symbols:A = Z + NThe number of protons is the same for any isotope of the same element. This is, all the isotopic forms of silicon have the same number of prtons: 14
The number of neutrons is determined from the equation A = Z + N, solving for N:
N = A - Z = 28 - 14 = 14.Hence, the most common isotope of silicon has 14 protons and 14 neutrons.
Often atoms join so that each atom will have
a. an even number of electrons.
b. an outermost energy level that is full of electrons.
c. an equal number of protons and neutrons
d. more electrons than either protons or neutrons
Answer:
b. an outermost energy level that is full of electrons.
Explanation:
The reason why atoms combines is to have a complete outermost shell. When the outermost shell or valence shell of atoms are completely filled withe electrons, they become very stable. Noble gases for example, shows no tendency to react with other atoms because their outermost energy level is completely filled.
The tendency to have a completely filled outer energy level is what drives most atoms into bonding.
Atoms often form bonds in ways that lead to full outer levels of electrons, which provides stability, explained by the octet rule.
Explanation:Atoms often join in a way that each atom will have an outermost energy level that is full of electrons. This principle is known as the octet rule, which states that, atoms seek to have eight electrons in their outermost energy level to achieve a stable configuration similar to that of noble gases. For instance, oxygen has six electrons in its outer shell, and thus needs two more to complete its outermost energy level, which it can get by forming a bond with, say, two hydrogen atoms (each providing one electron).
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The combustion of ________ has added great quantities of carbon dioxide to the atmosphere.
Answer:
fossil fuel combustion
Explanation:
Fossil fuel is the source of energy that drives almost all industrial processes on the surface of earth. Burning of these fuels releases energy for use in automobiles, industries, homes e.t.c. The complete combustion of these fuels in the presence of oxygen liberates carbon-dioxide and water with heat energy.
Fossil fuels are to a large extent hydrocarbon compounds and their derivatives. They form from organisms million of years ago. When organic matter is prevented from decay in an oxic or oxygen rich environment, they are able to conserve and preserve the energy in them for a vast duration in geologic time. This preserved energy is what becomes available during combustion.
Some of the fossil fuels are oil, natural gas, coal, e.t.c.
Conduction occurs more easily between solids and liquids. This is because the particles in gases are
Answer:
farther apart and move faster.
Explanation:
if you have 10 grams of a substance that decays with a half life of 14 days then how much will you have after 70 days?
Answer: If it has a 1/2 life of 14 days, after 14 days there will be half of it left correct?
Explanation:So, how many half-lifes are in 42 days?
42 / 14 = 3
This means it will divide 3 times.
1st half life period: 10 / 2 = 5g
2nd period: 5 / 2 = 2.5g
3rd period: 2.5 / 2 = 1.25g
10 g at start, 5 g at 14 days, 2.5 g at 28 days, 1.25 g at 42 days.
Answer: The amount of substance left will be 0.316 grams.
Explanation:
All the decay processes follow first order kinetics.
The equation used to calculate half life for first order kinetics:
[tex]t_{1/2}=\frac{0.693}{k}[/tex]
where,
[tex]t_{1/2}[/tex] = half life of the reaction = 14 days
k = ?
Putting values in above equation, we get:
[tex]k=\frac{0.693}{14days}=0.0495days^{-1}[/tex]
Rate law expression for first order kinetics is given by the equation:
[tex]t=\frac{2.303}{k}\log\frac{a}{y}[/tex]
where,
k = rate constant = [tex]0.0495days^{-1}[/tex]
t = time taken for decay process = 70 days
a = initial amount of the reactant = 10 grams
y = amount left after decay process = ? grams
Putting values in above equation, we get:
[tex]70days=\frac{2.303}{0.0495days^{-1}}\log\frac{10g}{y}\\\\y=0.316g[/tex]
Hence, the amount of substance left will be 0.316 grams.
In the electrolysis of brine, the substances produced at the cathode are _____.
oxygen gas and hydroxide ions
sodium metal and hydrogen gas
chlorine gas and hydrogen gas
hydrogen gas and hydroxide ions
Answer:
In the electrolysis of brine, the substances produced at the cathode are sodium metal and hydrogen gas.
Explanation:
In the electrolysis of brine (Sodium chloride solution) using carbon as electrode, Chlorine gas is produced in the positive electrode (anode), while hydrogen gas is produced in the negative electrode (cathode).
Again, in the electrolysis of molten sodium chloride, chlorine gas is produced in anode, while sodium metal is produced in the cathode.
Nacl ⇄ Na⁺ + Cl⁻
Case 1: Molten Nacl
Anode(+ve) Product | Cathode (-ve) product
Cl⁻ -----> Cl + e⁻ | Na⁺ + e⁻ ---------> Na
Cl + Cl ------> Cl₂
Case 2: Nacl solution
Anode(+ve) Product | Cathode (-ve) Product
Cl⁻ -----> Cl + e⁻ | H⁺ + e⁻ ---------> H
Cl + Cl ------> Cl₂ | H + H ------------> H₂
Thus, cathodic products of electrolysis of brine are sodium metal and hydrogen gas
Which of the following equations is balanced correctly and has the correct products for the reactants RbNO3 and BeF2?3RbNO3 + 3BeF2 → Be(NO3)3 + 3RbF, because Be increases in charge from 2+ to 3+ when it is replaced2RbNO3 + BeF2 → Be(NO3)2 + 2RbF, because Be keeps a 2+ charge throughout the reactionRbNO3 + BeF2 → BeNO3 + RbF2, because Be keeps a 1+ charge throughout the reaction2RbNO3 + BeF2 → Be(NO3)2 + 2RbF, because Be increases in charge from 1+ to 2+ when it is replaced
Answer:
2RbNO₃ + BeF₂ → Be(NO₃)₂ + 2RbF, because Be keeps a 2+ charge throughout the reaction.
Explanation:
It is a double replacement reaction.A double replacement reaction is a type of chemical reaction where two compounds react, and the positive ions (cation) and the negative ions (anion) of the two reactants switch places, forming two new compounds or products.In this reaction, there is no change in the oxidation state of different atoms.It is just a replacement reaction.So, the right choice is:2RbNO₃ + BeF₂ → Be(NO₃)₂ + 2RbF, because Be keeps a 2+ charge throughout the reaction.
Answer:
b
Explanation:
Upon combustion, a compound containing only carbon and hydrogen produces 2.67 g[tex]CO_{2}[/tex] and 1.10 g[tex]H_{2}O[/tex]. Find the empirical formula of the compound.
Answer:
[tex]\boxed{\text{CH$_{2}$}}[/tex]
Explanation:
1. Calculate the mass of each element
[tex]\text{Mass of C} = \text{2.67 g } \text{CO}_{2}\times \dfrac{\text{12.01 g C}}{\text{44.01 g }\text{CO}_{2}}= \text{0.7286 g C}\\\\\text{Mass of H} = \text{1.10 g }\text{H$_{2}$O}\times \dfrac{\text{2.016 g H}}{\text{18.02 g } \text{{H$_{2}$O}}} = \text{0.1231 g H}[/tex]
2. Calculate the moles of each element
[tex]\text{Moles of C = 0.7286 g C}\times\dfrac{\text{1 mol C}}{\text{12.01 g C }} = \text{0.060 67 mol C}\\\\\text{Moles of H = 0.1231 g H} \times \dfrac{\text{1 mol H}}{\text{1.008 g H}} = \text{0.1221 mol H}[/tex]
3. Calculate the molar ratios
Divide all moles by the smallest number of moles.
[tex]\text{C: } \dfrac{0.06067}{0.06067}= 1\\\\\text{H: } \dfrac{0.1221}{0.06067} = 2.015[/tex]
4. Round the ratios to the nearest integer
C:H = 1:2
5. Write the empirical formula
The empirical formula is [tex]\boxed{\text{CH$_{2}$}}[/tex]
The empirical formula of the compound is CH.
To find the empirical formula of the compound, we need to determine the molar ratios of carbon and hydrogen in the compound based on the masses of carbon dioxide (CO₂) and water (H₂O) produced during combustion.
First, we calculate the moles of carbon in CO₂:
The molar mass of CO₂ is 44.01 g/mol (12.01 g/mol for C and 2 × 16.00 g/mol for O₂).
Moles of CO₂ = 2.67 g / 44.01 g/mol = 0.0607 mol
Since there is one mole of carbon in one mole of CO₂, the moles of carbon are also 0.0607 mol.
Next, we calculate the moles of hydrogen in H₂O:
The molar mass of H₂O is 18.015 g/mol (2 × 1.008 g/mol for H₂ and 16.00 g/mol for O).
Moles of H₂O = 1.10 g / 18.015 g/mol = 0.0611 mol
The moles of hydrogen:
Moles of H in H₂O = 2 × Moles of H₂O = 2 × 0.0611 mol = 0.1222 mol
Now, let's re-calculate the molar ratio of carbon to hydrogen:
Moles of C / Moles of H = 0.0607 mol / 0.1222 mol = 1/2
This ratio simplifies to:
C: 1
H: 1
Therefore, the correct empirical formula of the compound is CH, not CH₂ as previously stated. The error in the initial calculation has been corrected, and the correct empirical formula is CH.
Which of the following properties is shared by solids and liquids? Their particles are far apart. Their particles move randomly. They have a definite volume. They consist of charged particles.
Answer:
They have a definite volume
Explanation:
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Answer: Option (c) is the correct answer.
Explanation:
In solids, particles are held together by strong intermolecular forces of attraction between them. Due to this reason solids acquire a definite shape and volume.
Whereas in liquids, particles are held by less strong intermolecular forces of attraction. As a result, molecules are able to slide past each other. Liquids acquire the shape and volume of a container in which they are kept.
Hence, liquids also show fixed volume.
Thus, we can conclude that property shared by solids and liquids is that they have a definite volume.
the elements lithium and oxygen react explosively to form lithium oxide,Li2O. how many moles of lithium oxide will form if 4.37 mol of lithium tract?
4Li(s) +O2(g) -> 2Li2O(s)
From the equation,
4 mole of lithium produces 2 mole of lithium oxide
4.37 mol of lithium produces (4.37÷4)x2 mol of lithium oxide
In a nonpolar covalent bond,
protons are shared equally by two atoms.
electrons are shared equally by two atoms.
electrons are shared unequally by two atoms.
protons are transferred from one atom to another.
Which molecule below has a triple covalent bond?
Diatomic Fluorine
Diatomic Nitrogen
Diatomic Oxygen
Diatomic Hydrogen
Answer:
#11: In a nonpolar covalent bond, electrons are shared equally between two atoms.
#12: Only the diatomic nitrogen molecule [tex]\rm N_2[/tex] contains a triple covalent bond among the four molecules.
Explanation:
#11Consider: what is a covalent bond?
Two atoms share a pair of electrons (called a bonding pair as opposed to a lone pair) between them.
Nonpolar covalent bonds exist only between atoms with similar electronegativity values. The two bonding atoms attract the bonding pair with similar strength, such that the bonding pair is shared mostly equally between the two atoms.
In case the two atoms differ in their electronegativity, the bonding pair will be closer to the more electronegative atom. That will make a polar covalent bond.
#12Atoms share electrons with each other to achieve an octet of eight valence electrons (two for hydrogen.) Atoms form a covalent bond for every two valence electrons that they need.
Consider: how many electrons do atoms in each molecule need to gain before achieving an octet?
Fluorine is in group 17 of the new IUPAC periodic table. Each fluorine atom needs 18 - 17 = 1 valence electron to achieve an octet. There are two fluorine atoms in an [tex]\rm F_2[/tex] molecule. These two atoms will need two electrons in total to achieve an octet. They will thus need to form [tex]2/2 = 1[/tex] covalent bond.
Similarly:
Nitrogen is in group 15.Each Nitrogen atom is 18 - 15 = 3 electrons away from an octet.There are two nitrogen atoms in each [tex]\rm N_2[/tex] molecule. The two nitrogen atoms need six more electrons in total and will form [tex]6/2 =3[/tex] covalent bonds.Oxygen is in group 16.Each oxygen atom is 18 - 16 = 2 electrons away from an octet.There are two oxygen atoms in each [tex]\rm O_2[/tex] molecule. The two oxygen atoms need four more electrons in total and will form [tex]4/2 =2[/tex] covalent bonds.Hydrogen is a special case in the "octet" rule.Each hydrogen atom needs one valence electron to attain the electron configuration of the next noble gas element, He. There are two hydrogen atoms in each [tex]\rm H_2[/tex] molecule. The two hydrogen atoms need two more electrons in total and will form [tex]2/2 =1[/tex] covalent bonds.Answer:
11. Electrons are shared equally by two atoms.
12. Diatomic nitrogen
Explanation:
An example of the the first bond is the diatomic hydrogen.
There are 5 electrons in the nitrogen atom's outer shell. The 2 nitrogen atoms will each share 3 electrons to form 3 covalent bonds.
What do acidic solutions have high concentrations of?
Answer:
Hydrogen ions
Explanation:
Acidic solutions have high concentrations of hydronium ions and a lower concentration of hydroxide ions. The concentration of hydronium ions determines the acidity of the solution.
Explanation:Acidic solutions have high concentrations of hydronium ions (H+) and a proportionally lower concentration of hydroxide ions (OH-). This is due to the ionization of the acid, which releases H+ ions into the solution. The concentration of hydronium ions is a critical determinant of the solution's acidity.
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If aluminum is the limiting reactant, SOME/NONE/ALL of it will still be visible after the reaction completes. If CuCl2 is the limiting reactant,SOME/NONE/ALL of the aluminum will still be visible.
Answer:
If aluminum is the limiting reactant, NONE of it will still be visible after the reaction completes.
If CuCl2 is the limiting reactant, SOME of the aluminum will still be visible.
Explanation:
Any chemical reaction, if the reactants are not in equimolar ratios, contains limiting reactant and leftover reactant.The limiting reactant in a chemical reaction is the reactant that is totally consumed when the chemical reaction is complete. The amount of product formed is limited by this reagent, since the reaction cannot continue without it.The leftover reactant is the reactant that is in excess and not consumed completely and some of it remains in the reaction mixture.So,
If aluminum is the limiting reactant, NONE of it will still be visible after the reaction completes.
and,
If CuCl2 is the limiting reactant, SOME of the aluminum will still be visible.
Answer:
If aluminum is the limiting reactant, none of it will still be visible after the reaction completes.
If CuCl2 is the limiting reactant, some of the aluminum will still be visible.
When you breathe out, there is water vapor in your breath. When you breathe on a cold window in the winter, the window gets tiny droplets of moisture on it or “fogs up.” What happens to the molecules of water vapor as they get near the cold window?
The water molecules in your breath are the gas water vapor. They slow down as they transfer some of their energy to the cold window. The attractions between the slower-moving water vapor molecules bring them together to form tiny droplets of liquid water.
circle the precipitate in the following the reactions: Ba (aq) + Co( aq) --> BaCo3 (s)
Answer:
BaCo3 (s)
Explanation:
Because it is being formed from two aqueous solutions, and the (s) indicates that it is a solid. Precipitate means "formed into solid". Since BaCo3 is a product, is solid, is formed from two aqueous solutions, it is a precipitate.
Which is an advantage of using space observatories for space exploration? Allows scientists to send a crew into space allows scientists to repair damaged satellites allows scientists to collect samples with a rover allows scientists to avoid the effects of light pollution
Answer:
allows scientists to avoid the effects of light pollution
Explanation:
Space Observatories are instruments such as telescopes that are used for explorations in space.
The main functions of a space observatory is that it helps scientists to be able to view very clear images of objects that are in space such as stars and other planetary bodies.
Space observatories when used on earth , have the tendency to absorb ultraviolet and infrared rays which can be very dangerous to the health of scientists but when these space observatories are used for explorations in space, it's major benefit is that it protects the scientists from light pollution such as ultraviolet radiation and infrared light.
how does carbon dioxide malfunction
Answer:
if in excess the carbon dioxide is harmful to both the humen and other living things.
Explanation:
in our daily life we exhale carbon dioxide after inhaling oxygen.
but if carbon dioxide is in excess in atmosphere which is caused by burning fossils may cause changes in weather and climate at large due to aerosol particle emittion which inturn cause damage to o-zone layer causing global warming.which are effect to aquatic life and also to human.
Read the excerpt from Levitt and Dubner’s Freakonomics.
If morality represents the way we would like the world to work and economics represents how it actually does work, then the story of Feldman’s bagel business lies at the very intersection of morality and economics. Yes, a lot of people steal from him, but the vast majority, even though no is watching over them, do not. This outcome may surprise some people—including Feldman’s economist friends, who counseled him twenty years ago that his honor-system scheme would never work. But it would not have surprised Adam Smith. In fact, theme of Smith’s first book, the Theory of Moral Sentiments, was the innate honesty of mankind. “How selfish soever man may be supposed,” Smith wrote, “there are evidently some principles in his nature which interest him in the fortune of others, and render their happiness necessary to him, though he derives nothing from it, except the pleasure of seeing it.”
Which best describes the authors’ purpose in using a quotation from Adam Smith’s book The Theory of Moral Sentiments?
to highlight their knowledge of Scottish philosophers
to prove that people are inherently dishonest
to demonstrate that incentive is the driving force behind cheating
to lend credibility and additional support to their conclusion
Answer:
D
Explanation:
100% on test
The correct answer is: to lend credibility and additional support to their conclusion.
In the excerpt from Levitt and Dubner Freakonomics, the authors are discussing the intersection of morality and economics through the example of a bagel business that operates on an honor system. Despite the predictions of economists that such a system would fail due to rampant theft, the business succeeds because most people choose not to steal even when unsupervised.
The authors then reference Adam Smith's The Theory of Moral Sentiments, where Smith discusses the innate honesty and empathy within humanity.
The purpose of including the quotation from Adam Smith is not merely to showcase their knowledge of the Scottish philosopher, as this would be more of a display of erudition rather than a contribution to their argument.
Similarly, they are not using the quotation to prove that people are inherently dishonest, as Smith's work actually suggests the opposite that there is an inherent honesty and concern for others in human nature.
The authors also do not use the quotation to argue that incentive is the driving force behind cheating.
While incentives are a significant topic in economics and are discussed in Adam Smith's other major work, The Wealth of Nations, the quotation provided here emphasizes the natural inclination towards honesty rather than the role of incentives in promoting dishonesty.
Instead, the authors use Smith's quotation to lend credibility and additional support to their conclusion that the honor-system scheme works because of an inherent sense of morality in most people.
By invoking a respected economist and moral philosopher who argued for the existence of moral principles that guide human behavior, even when there is no direct benefit to oneself, Levitt and Dubner strengthen their argument that moral behavior can prevail in economic transactions, contrary to what might be expected based on pure economic self-interest.
Adam Smith's authority in both economics and moral philosophy makes his perspective particularly relevant and persuasive in supporting the authors' observations about human behavior in the context of the bagel business.
You are running a lemonade stand with your friend. You prepared 10 liters of 0.7 molarity lemonade, but your friend did online research and found that people prefer 0.4 Molarity lemonade. How can you fix the lemonade you made so that it is 0.4 Molarity without starting over?
Answer:
add 7.5L of water
Explanation:
M1×V1=M2×V2
M is molarity, V is volume
0.7 × 10 = 0.4 × V2
V2= 17.5L
vol. of water to add= 17.5 - 10 = 7.5L
The volume which is required to prepare 0.4M lemonade is 17.5L.
How do we calculate the required volume?Required volume of the solution will be calculated by using the below equation as:
M₁V₁ = M₂V₂, where
M₁ & V₁ are the molarity and volume of initial lemonade.
M₂ & V₂ are the molarity and volume of final prepared lemonade.
On putting all values from the question, we get
V₂ = (0.7)(10) / (0.4) = 17.5 L
Hence required volume of final lemonade is 17.5 L.
To know more about molarity & volume, visit the below link:
https://brainly.com/question/15226282
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What is the approximate vapor pressure when the gas condenses at 80°C?
A. 200
B. 5
C. 760
D. 400
Answer: D. 400
Explanation: The given image of the graph explains the relation between the pressure and the temperature of the substance.
Through this graph, one can find the approximate vapor pressure at any phase of the substance.
Thus as we can observe from the graph that the the approximate vapor pressure when the gas condenses at 80°C is 400.