Deck 4: Stoichiometry of Chemical Reactions

Question 1

The reaction CH₄g) + 2O₂g) $\rightarrow$ CO₂g) + 2H₂Og) is an example of _____? Paired item 1)

A) an acid-base reaction
B) a combustion reaction
C) a precipitation reaction

Answer 1

a combustion reaction

Question 2

What precipitate forms when mixing copperII) sulfate and sodium sulfate? Outcome # 5) DOK 2)

A) copperI) sulfate
B) copperIII) sulfate
C) no precipitate forms

Answer 2

no precipitate forms

Question 3

The symbol that separates the reactants from products in a reaction and means "to yield" is ________.

A) +
B) s)
C) ( $\rightarrow$ )

Answer 3

( $\rightarrow$ )

Question 4

Which of the following is a strong acid when mixed in water? Outcome # 1,2,5) DOK 1

A) HClO
B) HBr
C) HNO₂

Question 5

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: Outcome # 1,2) DOK 3

A) decomposition reaction
B) displacement reaction
C) combination reaction

Question 6

Fewer steps are required to solve stoichiometry problems when Outcome # 1,2) DOK 2)

A) the amount of reactant is given in grams and the product is sought in grams.
B) the amount of reactant is given in moles and the product is sought in moles.
C) the amount reactant is given in grams and the product is sought in liters.

Question 7

What precipitate forms when mixing silverI) nitrate and sodium chloride? Outcome # 5) DOK 2) Paired item 1)

A) silverI) chloride
B) sodium nitrate
C) no precipitate forms

Question 8

The chemical reaction CaCO₃ $\rightarrow$ CaO + CO₂ is classified as a

A) synthesis reaction
B) decomposition reaction
C) single-replacement reaction

Question 9

What are the products when reacting potassium hydroxide and hydrogen chloride? Outcome # 5) DOK 2)

A) potassium chloride and water
B) potassium hydroxide and water
C) no reaction

Question 10

What precipitate forms when mixing leadII) nitrate and sodium iodide? Outcome # 5) DOK 2) Paired item 2)

A) sodium nitrate
B) leadII) iodide
C) no precipitate forms

Question 11

What are the products of the reaction between barium hydroxide and hydrogen chloride? Outcome # 1,2,5,6,9) DOK 2

A) Barium chloride and water
B) Barium hydroxide and water
C) Barium chloride and barium hydride

Question 12

The reaction HNO₃aq) + NaOHaq) $\rightarrow$ NaNO₃aq) + H₂Ol) is an example of _____?

A) an acid-base reaction
B) a combustion reaction
C) a precipitation reaction

Question 13

When mixing a strong acid and water together, it is recommended that you do which of the following? Outcome # 5) DOK 1)

A) add water to the strong acid
B) add the strong acid to water
C) add them in any order

Question 14

Ozone, O₃, is a product in automobile exhaust by the reaction represented by the equation NO₂g) + O₂g) $\rightarrow$ NOg) + O₃g). What mass of ozone is predicted to form from the reaction of 2.0 g NO₂ in a car's exhaust and excess oxygen?

A) 1.1 g O₃
B) 1.8 g O₃
C) 2.1 g O₃

Question 15

Which of the following is a strong acid? Outcome # 1,3,5,9) DOK 1

A) HNO₃
B) CaSO₄
C) NH₃

Question 16

Which of the following reactions are written correctly? Paired item 1)

A) H₂NO₃aq) + 2NaOHaq) $\rightarrow$ Na₂NO₃aq) + 2H₂Ol)
B) HNO₃aq) + K₂OHaq) $\rightarrow$ K₂NO₃aq) + H₂Ol)
C) HNO₃aq) + NaOHaq) $\rightarrow$ NaNO₃aq) + H₂Ol)

Question 17

Which of the following reactions are written correctly?

A) H₂SO₄aq) + 2 NaOHaq) $\rightarrow$ Na₂SO₄aq) + 2H₂Ol)
B) 2HClaq) + K₂OHaq) $\rightarrow$ 2KClaq) + H₂Ol)
C) 2HSO₄aq) + 2NaOHaq) $\rightarrow$ 2NaSO₄aq) + 2H₂Ol)

Question 18

How many mole ratios can be correctly obtained from the balanced chemical equation 2Al₂O₃l) $\rightarrow$ 4Als) + 3O₂g)?

A) 3
B) 4
C) 6

Question 19

When MgOH)₂ reacts with H₂SO₄ what are the products? Outcome # 1,2,6) DOK 2

A) MgOH)₂ and H₂SO₄
B) MgSO₄ and H₂O
C) MgO and H₂SO₄

Question 20

What is the correct name for the precipitate formed when mixing potassium carbonate and nickelII) chloride? Outcome # 2) DOK 2)

A) potassium chloride
B) nickelII) carbonate
C) nickelIII) carbonate

Question 21

Write a balanced reaction for the neutralization of HBr upon the addition of KOH.

A) HBraq) + KOHaq) $\rightarrow$ KBraq) + H₂Ol)
B) HBraq) + KOHaq) $\rightarrow$ KBrs) + H₂Ol)
C) HBraq) + KOHaq) $\rightarrow$ KBrl) + H₂Ol)

Question 22

What is the oxidation number of Mn in a permanganate anion? Outcome # 8) DOK 2)

A) +4
B) +7
C) +2

Question 23

What is the oxidation number of Cr in a dichromate anion? Outcome # 8) DOK 2)

A) +6
B) +3
C) +2

Question 24

What mass of methane is required to produce 1.130 kg of carbon dioxide during combustion? Assume the reaction undergoes complete combustion.) Outcome # 8) DOK 3)

A) 41.18 g
B) 0.4118 g
C) 411.8 g

Question 25

How many moles of KOH are needed to neutralize 35.0 mL of 0.115 M HNO₃ solution? Outcome # 8) DOK 2)

A) 4.03 x 10^-3 moles
B) 4.03 x 10¹ moles
C) 1.15 x 10^-1 moles

Question 26

What is the oxidation number of diatomic elements? Outcome # 8) DOK 1)

A) 0
B) +1
C) +2

Question 27

How many moles of NaOH are needed to neutralize 15.0 mL of 0.235 M HCl solution? Outcome # 8) DOK 2) Paired item 1)

A) 3.53 x 10¹ moles
B) 2.35 x 10^-1 moles
C) 3.53 x 10^-3 moles

Question 28

How many electrons are transferred during the oxidation of iron metal to form rust? Outcome # 8) DOK 2)

A) 3 electrons
B) 6 electrons
C) 12 electrons

Question 29

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? Outcome # 8) DOK 3) Paired item 1)

A) 38.1 %
B) 95.8 %
C) 0.958 %

Question 30

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? Outcome # 9) DOK 3)

A) 253 g
B) 380 g
C) 127 g

Question 31

Which is the correct balanced reaction for the combustion of octane?

A) 2C₈H₁₈l) + 25O₂g) $\rightarrow$ 16CO₂g) + 18H₂Og)
B) C₈H₁₈l) + 25Og) $\rightarrow$ 8CO₂g) + 9H₂Og)
C) C₈H₁₈l) + 12.5O₂g) $\rightarrow$ 8CO₂g) + 9H₂Og)

Question 32

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? Outcome # 8) DOK 3)

A) 371.2 g
B) 0.8377 g
C) 0.3712 g

Question 33

What is the oxidation number of free elements? Outcome # 8) DOK 1)

A) 0
B) +1
C) +2

Question 34

What is the oxidation number of hydrogen in H₂O₂? Outcome # 8) DOK 1)

A) +2
B) +1
C) 0

Question 35

How many moles of HCl are needed to completely react with 50.0 mL of 0.250 M NaOH solution? Outcome # 8) DOK 2)

A) 1.25 x 10^-2 moles
B) 1.25 x 10¹ moles
C) 2.50 x 10^-1 moles

Question 36

Which is the correct balanced reaction for the combustion of methane? Paired item 1)

A) CH₄g) + O₂g) $\rightarrow$ CO₂g) + H₂Og)
B) CH₄g) + 4Og) $\rightarrow$ CO₂g) + 2H₂Og)
C) CH₄g) + 2O₂g) $\rightarrow$ CO₂g) + 2H₂Og)

Question 37

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? Outcome # 8) DOK 3)

A) 38.5 %
B) 94.6 %
C) 0.946 %

Question 38

What instrument is used during an acid-base titration experiment to deliver the titrant? Outcome # 4) DOK 1)

A) buret
B) syringe
C) pipette

Question 39

If 1.50 moles of nitrogen gas reacts with an excess of hydrogen gas, what mass of ammonia would be produced? Outcome # 9) DOK 3)

A) 34.1 g
B) 51.1 g
C) 25.5 g

Question 40

Which is the correct balanced reaction for the combustion of octane?

A) 2C₈H₁₈g) + 25O₂g) $\rightarrow$ 16CO₂g) + 18H₂Og)
B) C₈H₁₈g) + 12.5O₂g) $\rightarrow$ 8CO₂g) + 9H₂Og)
C) C₈H₁₈g) + 25Og) $\rightarrow$ 8CO₂g) + 9H₂Og)

Question 41

Write the net ionic equation for a reaction between a strong acid and strong base.

A) HClaq) + NaOHaq) $\rightarrow$ NaClaq) + H₂Ol)
B) H⁺aq) + OH^-aq) $\rightarrow$ H₂Ol)
C) H₂Ol) $\rightarrow$ H⁺aq) + OH^-aq)

Question 42

Propane is used as a fuel source on many barbeque grills. What is undergoing reduction during the burning of propane while grilling? Outcome # 6) DOK 3) Paired item 1)

A) CH₃CH₂CH₃
B) O₂
C) CO₂

Question 43

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? Outcome # 6) DOK 3)

A) 34.4 g
B) 133 g
C) 68.8 g

Question 44

What are the products of the reaction between barium hydroxide and hydrogen chloride? Outcome # 1,5,6,9) DOK 2)

A) barium chloride and water
B) barium hydroxide and water
C) barium chloride and barium hydride

Question 45

What is the net ionic equation for the reaction between CoCl₂ and an alkali hydroxide?

A) Co²⁺aq) + 2OH^-aq) $\rightarrow$ CoOH)₂s)
B) Na⁺aq) + Cl^-aq) $\rightarrow$ NaCls)
C) Co³⁺aq) + 3OH^-aq) $\rightarrow$ CoOH)₃s)

Question 46

When a salt is dissolved in water, it is represented by the following notation in a chemical reaction? Outcome # 6) DOK 1)

A) aq)
B) l)
C) s)

Question 47

Identify the reactants in the following reaction: 2 CH₃OHl) + 3 O₂g) $\rightarrow$ 2 CO₂g) + 4 H₂Og)

A) CH₃OH
B) CH₃OH and O₂
C) CO₂ and H₂O

Question 48

Which is the oxidizing agent in the combustion of methanol? Outcome # 6) DOK 3)

A) CH₃OH
B) O₂
C) CO₂

Question 49

How is a solid phase represented in a chemical reaction? Outcome # 6) DOK 1)

A) s)
B) g)
C) l)

Question 50

How is a liquid phase represented in a chemical reaction? Outcome # 6) DOK 1)

A) s)
B) g)
C) l)

Question 51

What is the oxidation number of oxygen in H₂O₂? Outcome # 8) DOK 2)

A) -2
B) -1
C) 0

Question 52

Propane is used as a fuel source on many barbeque grills. What is undergoing oxidation during the burning of propane while grilling? Outcome # 6) DOK 3)

A) CH₃CH₂CH₃
B) O₂
C) CO₂

Question 53

The reaction NH₃aq) + H₂Ol) $\rightarrow$ OH^-aq) + NH₄⁺aq) is an example of _____?

A) a combustion reaction
B) an acid-base reaction
C) a precipitation reaction

Question 54

Which of the following is a strong acid? Outcome # 1,3,9) DOK 1)

A) HNO₃
B) CaSO₄
C) NH₃

Question 55

Which is the reducing agent in the combustion of methanol? Outcome # 6) DOK 3)

A) CH₃OH
B) O₂
C) CO₂

Question 56

What is the oxidation number of oxygen gas in the combustion of pentane reaction? Outcome # 6) DOK 3)

A) 0
B) -1
C) -2

Question 57

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? Outcome # 6) DOK 3)

A) 296 g
B) 593 g
C) 148 g

Question 58

When CaOH)₂ reacts with H₂SO₄ what are the products? Outcome # 1,5,6,9) DOK 2)

A) CaOH)₂ and H₂SO₄
B) CaSO₄ and H₂O
C) CaO and H₂SO₄

Question 59

Which of the following is a strong acid when mixed in water? Outcome # 1,5,9) DOK 2)

A) HClO
B) HBr
C) HNO₂

Question 60

How is a gas phase represented in a chemical reaction? Outcome # 6) DOK 1)

A) s)
B) g)
C) l)

Question 61

The combustion of butane produced 0.0243 kg of carbon dioxide. What mass of butane is required if the yield is 89 %. Outcome # 5) DOK 3) Paired item 1)

A) 36.1 g
B) 9.01 g
C) 144.2 g

Question 62

The combustion of propane produced 8.53 g of carbon dioxide. What mass of propane is required if the yield is 93 %. Outcome # 5) DOK 3)

A) 3.06 g
B) 9.19 g
C) 27.6 g

Question 63

The symbol that separates the reactants from products in a reaction and means "to yield" is ________.

A) +
B) s)
C) ( $\rightarrow$ )

Question 64

Which compound is insoluble in water? Outcome # 2) DOK 2)

A) CaCO₃
B) LiOH
C) Na₂S

Question 65

Which of the following is a redox reaction?

A) Zns) + 2 HClaq) $\rightarrow$ ZnCl₂aq) + H₂g)
B) HNO₃aq) + KOHaq) $\rightarrow$ KNO₃aq) + H₂Ol)
C) ZnSO₄aq) + Hg₂NO₃)₂aq) $\rightarrow$ Hg₂SO₄s) + ZnNO₃)₂aq)

Question 66

When balancing a chemical reaction, the following may need to be changed? Outcome # 2) DOK 1)

A) subscripts
B) coefficients
C) phases

Question 67

In a chemical reaction, the right side of the yield arrow is where the _____ can be found. Outcome # 2) DOK 1)

A) reactants
B) products
C) both reactant and products

Question 68

What is the correct formula for the precipitate formed between NaNO₃ and mercury nitrate? Outcome # 9) DOK 3)

A) Hg₂NO₃
B) HgNO₃)₂
C) no reaction between NaNO₃ and mercury nitrate

Question 69

What is the oxidation state of oxygen in H₂O₂? Outcome # 2) DOK 2)

A) 0
B) -1
C) -2

Question 70

Which of the following is a weak base? Outcome # 2) DOK 1)

A) sodium hydroxide
B) potassium hydroxide
C) ammonia

Question 71

Hydrogen peroxide readily decomposes in the presence of a catalyst to form oxygen gas and water. What is the correct balanced reaction?

A) 4HO₂aq) $\rightarrow$ 3O₂g) + 2H₂Ol)
B) H₂O₂aq) $\rightarrow$ Og) + H₂Ol)
C) 2H₂O₂aq) $\rightarrow$ O₂g) + 2H₂Ol)

Question 72

Which of the following is a weak acid? Outcome # 2) DOK 1)

A) acetic acid
B) sulfuric acid
C) perchloric acid

Question 73

The chemical reaction CaCO₃ $\rightarrow$ CaO + CO₂ is classified as a

A) synthesis reaction
B) decomposition reaction
C) single-replacement reaction

Question 74

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? Outcome # 5) DOK 3)

A) 33.3 %
B) 66.6 %
C) cannot be determined

Question 75

Which of the following is an acid-base reaction?

A) Mgs) + 2HClaq) $\rightarrow$ MgCl₂aq) + H₂g)
B) HClO₄aq) + NaOHaq) $\rightarrow$ NaClO₄aq) + H₂Ol)
C) PbNO₃)₂aq) + 2KIaq) $\rightarrow$ PbI₂s) + 2KNO₃aq)

Question 76

What is the correct name for the salt formed between KOH and HCl? Outcome # 9) DOK 2)

A) potassium hydride
B) potassium chloride
C) potassium hydroxide

Question 77

Hydrogen gas can react with some halogen to produce hydrogen chloride. Write a correct balanced reaction and identify the oxidizing agent.

A) H₂g) + Cl₂g) $\rightarrow$ 2HClg) and Cl₂ is the oxidizing agent
B) H₂g) + Cl₂g) $\rightarrow$ 2HClg) and H₂ is the oxidizing agent
C) H₂g) + Cl₂g) $\rightarrow$ 2HClg) and HCl is the oxidizing agent

Question 78

Which of the following is a precipitation reaction?

A) Cas) + 2HClaq) $\rightarrow$ CaCl₂aq) + H₂g)
B) H₂SO₄aq) + 2NaOHaq) $\rightarrow$ Na₂SO₄aq) + 2H₂Ol)
C) 2NaOHaq) + MgCl₂aq) $\rightarrow$ 2 NaClaq) + MgOH)₂s)

Question 79

The coefficients in front of the substances in a chemical reaction indicate the number of each type of _____. Outcome # 2) DOK 1)

A) ionic bond
B) covalent bond
C) molecule

Question 80

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?

A) 2KClO₃s) $\rightarrow$ 2KCls) + 3O₂g)
B) KClO₄s) $\rightarrow$ KCls) + 2O₂g)
C) KClO₃s) $\rightarrow$ KCls) + 3Og)