Title: Chapter 4: Stoichiometry of Chemical Reactions
Course: Test

Q: When Mg(OH)_2 reacts with H_2SO_4 what are the products?
- Mg(OH)_2 and H_2SO_4
- MgSO_4 and H_2O
- MgO and H_2SO_4
A: MgSO_4 and H_2O

Q: Which of the following is a strong acid?
- HNO_3
- CaSO_4
- NH_3
A: HNO_3

Q: Which of the following is a strong acid when mixed in water?
- HClO
- HBr
- HNO_2
A: HBr

Q: What are the products of the reaction between barium hydroxide and hydrogen chloride?
- Barium chloride and water
- Barium hydroxide and water
- Barium chloride and barium hydride
A: Barium chloride and water

Q: The symbol that separates the reactants from products in a reaction and means “to yield” is ________.
- +
- (s)
- →
A: →

Q: The chemical reaction CaCO_3→CaO + CO_2 is classified as a
- synthesis reaction
- decomposition reaction
- single-replacement reaction
A: decomposition reaction

Q: How many mole ratios can be correctly obtained from the balanced chemical equation 2Al_2O_3(l) →4Al(s) + 3O_2(g)?
- 3
- 4
- 6
A: 6

Q: Fewer steps are required to solve stoichiometry problems when
- the amount of reactant is given in grams and the product is sought in grams.
- the amount of reactant is given in moles and the product is sought in moles.
- the amount reactant is given in grams and the product is sought in liters.
A: the amount of reactant is given in moles and the product is sought in moles.

Q: Ozone, O_3, is a product in automobile exhaust by the reaction represented by the equation NO_2(g) + O_2(g) →NO(g) + O_3(g). What mass of ozone is predicted to form from the reaction of 2.0 g NO_2 in a car’s exhaust and excess oxygen?
- 1.1 g O_3
- 1.8 g O_3
- 2.1 g O_3
A: 2.1 g O_3

Q: A 15.0 g sample of a white, solid substance, is heated in the presence of air. The solid remaining after heating has a mass of 12.6 g. The reaction that took place must have been a/an:
- decomposition reaction
- displacement reaction
- combination reaction
A: decomposition reaction

Q: When mixing a strong acid and water together, it is recommended that you do which of the following?
- add water to the strong acid
- add the strong acid to water
- add them in any order
A: add the strong acid to water

Q: What are the products when reacting potassium hydroxide and hydrogen chloride?
- potassium chloride and water
- potassium hydroxide and water
- no reaction
A: potassium chloride and water

Q: What precipitate forms when mixing copper(II) sulfate and sodium sulfate?
- copper(I) sulfate
- copper(III) sulfate
- no precipitate forms
A: no precipitate forms

Q: What precipitate forms when mixing silver(I) nitrate and sodium chloride?
- silver(I) chloride
- sodium nitrate
- no precipitate forms
A: silver(I) chloride

Q: What precipitate forms when mixing lead(II) nitrate and sodium iodide?
- sodium nitrate
- lead(II) iodide
- no precipitate forms
A: lead(II) iodide

Q: Which of the following reactions are written correctly?
- H_2SO_4(aq) + 2 NaOH(aq) →Na_2SO_4(aq) + 2H_2O(l)
- 2HCl(aq) + K_2OH(aq) →2KCl(aq) + H_2O(l)
- 2HSO_4(aq) + 2NaOH(aq) →2NaSO_4(aq) + 2H_2O(l)
A: H_2SO_4(aq) + 2 NaOH(aq) →Na_2SO_4(aq) + 2H_2O(l)

Q: Which of the following reactions are written correctly?
- H_2NO_3(aq) + 2NaOH(aq) →Na_2NO_3(aq) + 2H_2O(l)
- HNO_3(aq) + K_2OH(aq) →K_2NO_3(aq) + H_2O(l)
- HNO_3(aq) + NaOH(aq) →NaNO_3(aq) + H_2O(l)
A: HNO_3(aq) + NaOH(aq) →NaNO_3(aq) + H_2O(l)

Q: What is the correct name for the precipitate formed when mixing potassium carbonate and nickel(II) chloride?
- potassium chloride
- nickel(II) carbonate
- nickel(III) carbonate
A: nickel(II) carbonate

Q: The reaction HNO_3(aq) + NaOH(aq) →NaNO_3(aq) + H_2O(l) is an example of _____?
- an acid-base reaction
- a combustion reaction
- a precipitation reaction
A: an acid-base reaction

Q: The reaction CH_4(g) + 2O_2(g) →CO_2(g) + 2H_2O(g) is an example of _____?
- an acid-base reaction
- a combustion reaction
- a precipitation reaction
A: a combustion reaction

Q: Which is the correct balanced reaction for the combustion of octane?
- 2C_8H_18(g) + 25O_2(g) →16CO_2(g) + 18H_2O(g)
- C_8H_18(g) + 12.5O_2(g) →8CO_2(g) + 9H_2O(g)
- C_8H_18(g) + 25O(g) →8CO_2(g) + 9H_2O(g)
A: 2C_8H_18(g) + 25O_2(g) →16CO_2(g) + 18H_2O(g)

Q: If 1.50 moles of nitrogen gas reacts with an excess of hydrogen gas, what mass of ammonia would be produced?
- 34.1 g
- 51.1 g
- 25.5 g
A: 51.1 g

Q: If 250.3 L of hydrogen gas (d = 0.0899 g/L) reacts with an excess of nitrogen gas, what mass of ammonia would be produced?
- 253 g
- 380 g
- 127 g
A: 127 g

Q: What instrument is used during an acid-base titration experiment to deliver the titrant?
- buret
- syringe
- pipette
A: buret

Q: The combustion of 0.136 kg of methane in the presence of excess oxygen produces 353 g of carbon dioxide. What is the percent yield?
- 38.5 %
- 94.6 %
- 0.946 %
A: 94.6 %

Q: The combustion of 0.374 kg of methane in the presence of excess oxygen produces 0.983 kg of carbon dioxide. What is the percent yield?
- 38.1 %
- 95.8 %
- 0.958 %
A: 95.8 %

Q: What mass of methane is required to produce 1.130 kg of carbon dioxide during combustion? (Assume the reaction undergoes complete combustion.)
- 41.18 g
- 0.4118 g
- 411.8 g
A: 411.8 g

Q: The combustion of 0.1240 kg of propane in the presence of excess oxygen produces 0.3110 kg of carbon dioxide. What is the theoretical yield?
- 371.2 g
- 0.8377 g
- 0.3712 g
A: 371.2 g

Q: Which is the correct balanced reaction for the combustion of octane?
- 2C_8H_18(l) + 25O_2(g) →16CO_2(g) + 18H_2O(g)
- C_8H_18(l) + 25O(g) →8CO_2(g) + 9H_2O(g)
- C_8H_18(l) + 12.5O_2(g) →8CO_2(g) + 9H_2O(g)
A: 2C_8H_18(l) + 25O_2(g) →16CO_2(g) + 18H_2O(g)

Q: Which is the correct balanced reaction for the combustion of methane?
- CH_4(g) + O_2(g) →CO_2(g) + H_2O(g)
- CH_4(g) + 4O(g) →CO_2(g) + 2H_2O(g)
- CH_4(g) + 2O_2(g) →CO_2(g) + 2H_2O(g)
A: CH_4(g) + 2O_2(g) →CO_2(g) + 2H_2O(g)

Q: Write a balanced reaction for the neutralization of HBr upon the addition of KOH.
- HBr(aq) + KOH(aq) →KBr(aq) + H_2O(l)
- HBr(aq) + KOH(aq) →KBr(s) + H_2O(l)
- HBr(aq) + KOH(aq) →KBr(l) + H_2O(l)
A: HBr(aq) + KOH(aq) →KBr(aq) + H_2O(l)

Q: The combustion of 0.296 kg of propane produces 713 g of carbon dioxide. What is the percent yield?
- 80.5 %
- 0.805 %
- 124 %
A: 80.5 %

Q: 0.450 kg of octane burned during combustion produces 1.25 kg of carbon dioxide. What is the percent yield?
- 0.901 %
- 90.1 %
- 36.0 %
A: 90.1 %

Q: How many moles of HCl are needed to completely react with 50.0 mL of 0.250 M NaOH solution?
- 1.25 × 10^-2 moles
- 1.25 × 10^1 moles
- 2.50 × 10^-1 moles
A: 1.25 × 10^-2 moles

Q: How many moles of KOH are needed to neutralize 35.0 mL of 0.115 M HNO_3 solution?
- 4.03 × 10^-3 moles
- 4.03 × 10^1 moles
- 1.15 × 10^-1 moles
A: 4.03 × 10^-3 moles

Q: How many moles of NaOH are needed to neutralize 15.0 mL of 0.235 M HCl solution?
- 3.53 × 10^1 moles
- 2.35 × 10^-1 moles
- 3.53 × 10^-3 moles
A: 3.53 × 10^-3 moles

Q: What is the oxidation number of Cr in a dichromate anion?
- +6
- +3
- +2
A: +6

Q: What is the oxidation number of Mn in a permanganate anion?
- +4
- +7
- +2
A: +7

Q: How many electrons are transferred during the oxidation of iron metal to form rust?
- 3 electrons
- 6 electrons
- 12 electrons
A: 12 electrons

Q: What is the oxidation number of free elements?
- 0
- +1
- +2
A: 0

Q: What is the oxidation number of diatomic elements?
- 0
- +1
- +2
A: 0

Q: What is the oxidation number of hydrogen in H_2O_2?
- +2
- +1
- 0
A: +1

Q: What is the oxidation number of oxygen in H_2O_2?
- -2
- -1
- 0
A: -1

Q: What is the net ionic equation for the reaction between CoCl_2 and an alkali hydroxide?
- Co^2+(aq) + 2OH^-(aq) →Co(OH)_2(s)
- Na^+(aq) + Cl^-(aq) →NaCl(s)
- Co^3+(aq) + 3OH^-(aq) →Co(OH)_3(s)
A: Co^2+(aq) + 2OH^-(aq) →Co(OH)_2(s)

Q: Write the net ionic equation for a reaction between a strong acid and strong base.
- HCl(aq) + NaOH(aq) →NaCl(aq) + H_2O(l)
- H^+(aq) + OH^-(aq) →H_2O(l)
- H_2O(l) →H^+(aq) + OH^-(aq)
A: H^+(aq) + OH^-(aq) →H_2O(l)

Q: Identify the reactants in the following reaction: 2 CH_3OH(l) + 3 O_2(g) →2 CO_2(g) + 4 H_2O(g)
- CH_3OH
- CH_3OH and O_2
- CO_2 and H_2O
A: CH_3OH and O_2

Q: If 23.6 g of hydrogen gas reacts with 28.3 g of nitrogen gas, what is the maximum amount of product that can be produced?
- 34.4 g
- 133 g
- 68.8 g
A: 34.4 g

Q: The catalytic decomposition of hydrogen peroxide occurs with the addition of KI. If 10 mL of a saturated KI solution was added to 315 g of hydrogen peroxide, how much oxygen gas would be produced?
- 296 g
- 593 g
- 148 g
A: 148 g

Q: What is the oxidation number of oxygen gas in the combustion of pentane reaction?
- 0
- -1
- -2
A: 0

Q: Which is the reducing agent in the combustion of methanol?
- CH_3OH
- O_2
- CO_2
A: CH_3OH

Q: Which is the oxidizing agent in the combustion of methanol?
- CH_3OH
- O_2
- CO_2
A: O_2

Q: Propane is used as a fuel source on many barbeque grills. What is undergoing oxidation during the burning of propane while grilling?
- CH_3CH_2CH_3
- O_2
- CO_2
A: CH_3CH_2CH_3

Q: Propane is used as a fuel source on many barbeque grills. What is undergoing reduction during the burning of propane while grilling?
- CH_3CH_2CH_3
- O_2
- CO_2
A: O_2

Q: When a salt is dissolved in water, it is represented by the following notation in a chemical reaction?
- (aq)
- (l)
- (s)
A: (aq)

Q: How is a solid phase represented in a chemical reaction?
- (s)
- (g)
- (l)
A: (s)

Q: How is a liquid phase represented in a chemical reaction?
- (s)
- (g)
- (l)
A: (l)

Q: How is a gas phase represented in a chemical reaction?
- (s)
- (g)
- (l)
A: (g)

Q: The reaction NH_3(aq) + H_2O(l) →OH^-(aq) + NH_4^+(aq) is an example of _____?
- a combustion reaction
- an acid-base reaction
- a precipitation reaction
A: an acid-base reaction

Q: Which of the following is a strong acid?
- HNO_3
- CaSO_4
- NH_3
A: HNO_3

Q: Which of the following is a strong acid when mixed in water?
- HClO
- HBr
- HNO_2
A: HBr

Q: When Ca(OH)_2 reacts with H_2SO_4 what are the products?
- Ca(OH)_2 and H_2SO_4
- CaSO_4 and H_2O
- CaO and H_2SO_4
A: CaSO_4 and H_2O

Q: What are the products of the reaction between barium hydroxide and hydrogen chloride?
- barium chloride and water
- barium hydroxide and water
- barium chloride and barium hydride
A: barium chloride and water

Q: The symbol that separates the reactants from products in a reaction and means “to yield” is ________.
- +
- (s)
- →
A: →

Q: The chemical reaction CaCO_3→CaO + CO_2 is classified as a
- synthesis reaction
- decomposition reaction
- single-replacement reaction
A: decomposition reaction

Q: What is the correct name for the salt formed between KOH and HCl?
- potassium hydride
- potassium chloride
- potassium hydroxide
A: potassium chloride

Q: What is the correct formula for the precipitate formed between NaNO_3 and mercury nitrate?
- Hg_2NO_3
- Hg(NO_3)_2
- no reaction between NaNO_3 and mercury nitrate
A: no reaction between NaNO_3 and mercury nitrate

Q: Which compound is insoluble in water?
- CaCO_3
- LiOH
- Na_2S
A: CaCO_3

Q: In a chemical reaction, the right side of the yield arrow is where the _____ can be found.
- reactants
- products
- both reactant and products
A: products

Q: The coefficients in front of the substances in a chemical reaction indicate the number of each type of _____.
- ionic bond
- covalent bond
- molecule
A: molecule

Q: When balancing a chemical reaction, the following may need to be changed?
- subscripts
- coefficients
- phases
A: coefficients

Q: What is the oxidation state of oxygen in H_2O_2?
- 0
- -1
- -2
A: -1

Q: Which of the following is a weak acid?
- acetic acid
- sulfuric acid
- perchloric acid
A: acetic acid

Q: Which of the following is a weak base?
- sodium hydroxide
- potassium hydroxide
- ammonia
A: ammonia

Q: Hydrogen gas can react with some halogen to produce hydrogen chloride. Write a correct balanced reaction and identify the oxidizing agent.
- H_2(g) + Cl_2(g) →2HCl(g) and Cl_2 is the oxidizing agent
- H_2(g) + Cl_2(g) →2HCl(g) and H_2 is the oxidizing agent
- H_2(g) + Cl_2(g) →2HCl(g) and HCl is the oxidizing agent
A: H_2(g) + Cl_2(g) →2HCl(g) and Cl_2 is the oxidizing agent

Q: Which of the following is a redox reaction?
- Zn(s) + 2 HCl(aq) →ZnCl_2(aq) + H_2(g)
- HNO_3(aq) + KOH(aq) →KNO_3(aq) + H_2O(l)
- ZnSO_4(aq) + Hg_2(NO_3)_2(aq) →Hg_2SO_4(s) + Zn(NO_3)_2(aq)
A: Zn(s) + 2 HCl(aq) →ZnCl_2(aq) + H_2(g)

Q: Which of the following is an acid-base reaction?
- Mg(s) + 2HCl(aq) →MgCl_2(aq) + H_2(g)
- HClO_4(aq) + NaOH(aq) →NaClO_4(aq) + H_2O(l)
- Pb(NO_3)_2(aq) + 2KI(aq) →PbI_2(s) + 2KNO_3(aq)
A: HClO_4(aq) + NaOH(aq) →NaClO_4(aq) + H_2O(l)

Q: Which of the following is a precipitation reaction?
- Ca(s) + 2HCl(aq) →CaCl_2(aq) + H_2(g)
- H_2SO_4(aq) + 2NaOH(aq) →Na_2SO_4(aq) + 2H_2O(l)
- 2NaOH(aq) + MgCl_2(aq) →2 NaCl(aq) + Mg(OH)_2(s)
A: 2NaOH(aq) + MgCl_2(aq) →2 NaCl(aq) + Mg(OH)_2(s)

Q: Solid potassium chlorate readily decomposes in the presence of a catalyst and heat to form oxygen gas and potassium salt. What is the correct balanced reaction?
- 2KClO_3(s) →2KCl(s) + 3O_2(g)
- KClO_4(s) →KCl(s) + 2O_2(g)
- KClO_3(s) →KCl(s) + 3O(g)
A: 2KClO_3(s) →2KCl(s) + 3O_2(g)

Q: Hydrogen peroxide readily decomposes in the presence of a catalyst to form oxygen gas and water. What is the correct balanced reaction?
- 4HO_2(aq) →3O_2(g) + 2H_2O(l)
- H_2O_2(aq) →O(g) + H_2O(l)
- 2H_2O_2(aq) →O_2(g) + 2H_2O(l)
A: 2H_2O_2(aq) →O_2(g) + 2H_2O(l)

Q: The combustion of propane produced 8.53 g of carbon dioxide. What mass of propane is required if the yield is 93%.
- 3.06 g
- 9.19 g
- 27.6 g
A: 3.06 g

Q: The combustion of butane produced 0.0243 kg of carbon dioxide. What mass of butane is required if the yield is 89%.
- 36.1 g
- 9.01 g
- 144.2 g
A: 9.01 g

Q: A reaction with an unknown theoretical yield was carried out and the amount of product obtained was a third of the theoretical yield. What is the percent yield?
- 33.3 %
- 66.6 %
- cannot be determined
A: 33.3 %

Q: A reaction with an unknown percent yield was carried out and the amount of product obtained was a fourth of the theoretical yield. What is the percent yield?
- 75.0 %
- 25.0 %
- cannot be determined
A: 25.0 %

Q: What is the density of a 0.354 M solution of ammonium phosphate?
- 0.0523 g/mL
- 5.23 g/mL
- 52.3 g/mL
A: 0.0523 g/mL

Q: What is the mass of ammonium chloride is 500.0 mL of a 0.198 M solution?
- 10.6 g
- 5.30 g
- 5.30 × 10^3 g
A: 5.30 g

Q: How many μL are in 0.239 mL of solvent?
- 2.39 × 10^5 μL
- 2.39 × 10^2 μL
- 2.39 × 10^-5 μL
A: 2.39 × 10^2 μL

Q: How many grams are in an 81 mg aspirin sample?
- 0.081 g
- 0.81 g
- 8.1 g
A: 0.081 g

Q: What is the product of hydrogen gas and oxygen gas?
- H_2O_2
- H_2O
- H_3O^+
A: H_2O

Q: Classify the following type of reaction: Mg(s) + 2HCl(aq) →MgCl_2(aq) + H_2(g).
- redox reaction
- combustion reaction
- acid/base reaction
A: redox reaction

Q: Classify the following type of reaction: C_3H_8(l) + 5O_2(g) →3CO_2(g) + 4H_2O(g).
- redox reaction
- combustion reaction
- acid/base reaction
A: combustion reaction

Q: Classify the following type of reaction: NaCl(aq) + AgNO_3(aq) →AgCl(s) + NaNO_3(aq).
- redox reaction
- acid/base reaction
- precipitation reaction
A: precipitation reaction

Q: Balance the following reaction: CaO + C →CaC_2 + CO_2.
- CaO_2 + 3C →CaC_2 + CO_2
- 2CaO_2 + 6C →2CaC_2 + 2CO_2
- 2CaO + 5C →2CaC_2 + CO_2
A: 2CaO + 5C →2CaC_2 + CO_2

Q: Ammonia reacts with oxygen in the air. Write a balanced chemical reaction.
- 4NH_3(g) + 5O_2(g) →4NO(g) + 6H_2O(l)
- 2NH_3(g) + 5O(g) →2NO(g) + 3H_2O(l)
- 2NH_3(g) + 3O_2(g) →2H_3NO_3(aq)
A: 4NH_3(g) + 5O_2(g) →4NO(g) + 6H_2O(l)

Q: What is the percent yield of a reaction if the product recovered is 89.4 g and the theoretical yield is 128.4 g?
- 144%
- 69.6%
- 0.696 %
A: 69.6%

Q: What is the percent yield of a reaction if the product recovered is 21.2 g and the theoretical yield is 28.4 g?
- 74.6%
- 134%
- 0.746%
A: 74.6%

Q: What is the percent yield of a reaction if the actual yield is 80.6% of the 42.4 g theoretical yield?
- 34.2%
- 19.4%
- 80.6%
A: 80.6%

Q: What is the theoretical yield of a reaction if the percent yield 92.4% and product recovered is 89.3 g?
- 89.3 g
- 96.6 g
- 82.5 g
A: 96.6 g

Q: What is the limiting reactant in the combustion of 159 g of methane in an open atmosphere?
- methane
- oxygen
- carbon dioxide
A: methane

Q: What is the excess reactant in the combustion of 211 g of methane in an open atmosphere?
- water
- methane
- oxygen
A: oxygen

Q: How many moles are in 1.25 g of calcium chloride?
- 8.88 × 10^1 moles
- 1.39 × 10^2 moles
- 1.13 × 10^-2 moles
A: 1.13 × 10^-2 moles

Q: How many moles are in 4.50 g of Na_2SO_4?
- 3.17 × 10^-2 moles
- 6.39 × 10^2 moles
- 3.16 × 10^1 moles
A: 3.17 × 10^-2 moles

Q: How many grams are in 12.5 moles of Ba(OH)_2?
- 7.30 × 10^-2 g
- 2.14 × 10^3 g
- 2.14 × 10^4 g
A: 2.14 × 10^3 g

Q: How many grams are in 2.57 moles of iron oxide?
- 4.10 × 10^2 g
- 6.21 × 10^1 g
- 1.61 × 10^-2 g
A: 4.10 × 10^2 g

Q: What is the molar mass of laughing gas, N_2O?
- 46.0 g/mol
- 30.0 g/mol
- 44.0 g/mol
A: 44.0 g/mol

Q: What salt is formed between LiOH and HBr?
- LiBr
- LiBr_2
- Li_2Br
A: LiBr