Question 1

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

Accepted Answer

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

Question 2

How is a liquid phase represented in a chemical reaction?

Accepted Answer

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

Question 3

Classify the following type of reaction: Mgs) + 2HClaq) $\rightarrow$  MgCl2aq) + H2g).

Accepted Answer

A)  redox reaction 
B)  combustion reaction 
C)  acid/base reaction 
A)  redox reaction 
B)  combustion reaction 
C)  acid/base reaction

Question 4

Which of the following reactions are written correctly?

Accepted Answer

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

Question 5

How many moles of HCl are needed to completely react with 50.0 mL of 0.250 M NaOH solution?

Accepted Answer

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

Question 6

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

Accepted Answer

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

Question 7

What is the product of hydrogen gas and oxygen gas?

Accepted Answer

A)  H2O2 
B)  H2O 
C)  H3O+ 
A)  H2O2 
B)  H2O 
C)  H3O+

Question 8

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

Accepted Answer

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

Question 9

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

Accepted Answer

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 
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 10

How many μL are in 0.239 mL of solvent?

Accepted Answer

A)  2.39 x 105 μL 
B)  2.39 x 102 μL 
C)  2.39 x 10-5 μL 
A)  2.39 x 105 μL 
B)  2.39 x 102 μL 
C)  2.39 x 10-5 μL

Question 11

How many grams are in an 81 mg aspirin sample?

Accepted Answer

A)  0.081 g 
B)  0.81 g 
C)  8.1 g 
A)  0.081 g 
B)  0.81 g 
C)  8.1 g

Question 12

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

Accepted Answer

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

Question 13

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?

Accepted Answer

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

Question 14

Which of the following is a strong acid when mixed in water?

Accepted Answer

A)  HClO 
B)  HBr 
C)  HNO2 
A)  HClO 
B)  HBr 
C)  HNO2

Question 15

What is the percent yield of a reaction if the actual yield is 80.6 % of the 42.4 g theoretical yield?

Accepted Answer

A)  34.2 % 
B)  19.4 % 
C)  80.6 % 
A)  34.2 % 
B)  19.4 % 
C)  80.6 %

Question 16

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?  Paired item 1)

Accepted Answer

A)  75.0 % 
B)  25.0 % 
C)  cannot be determined 
A)  75.0 % 
B)  25.0 % 
C)  cannot be determined

Question 17

Balance the following reaction: CaO + C $\rightarrow$ CaC2 + CO2.

Accepted Answer

A)  CaO2 + 3C $\rightarrow$ CaC2 + CO2 
B)  2CaO2 + 6C $\rightarrow$ 2CaC2 + 2CO2 
C)  2CaO + 5C $\rightarrow$  2CaC2 + CO2 
A)  CaO2 + 3C $\rightarrow$ CaC2 + CO2 
B)  2CaO2 + 6C $\rightarrow$ 2CaC2 + 2CO2 
C)  2CaO + 5C $\rightarrow$  2CaC2 + CO2

Question 18

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?

Accepted Answer

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

Question 19

Which compound is insoluble in water?

Accepted Answer

A)  CaCO3 
B)  LiOH 
C)  Na2S 
A)  CaCO3 
B)  LiOH 
C)  Na2S

Question 20

How many moles are in 4.50 g of Na2SO4?

Accepted Answer

A)  3.17 x 10-2 moles 
B)  6.39 x 102 moles 
C)  3.16 x 101 moles 
A)  3.17 x 10-2 moles 
B)  6.39 x 102 moles 
C)  3.16 x 101 moles

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

How is a liquid phase represented in a chemical reaction?

Classify the following type of reaction: Mgs) + 2HClaq) $\rightarrow$ MgCl₂aq) + H₂g).

Which of the following reactions are written correctly?

How many moles of HCl are needed to completely react with 50.0 mL of 0.250 M NaOH solution?

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

What is the product of hydrogen gas and oxygen gas?

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

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

How many μL are in 0.239 mL of solvent?

How many grams are in an 81 mg aspirin sample?

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

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?

Which of the following is a strong acid when mixed in water?

What is the percent yield of a reaction if the actual yield is 80.6 % of the 42.4 g theoretical yield?

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? Paired item 1)

Balance the following reaction: CaO + C $\rightarrow$ CaC₂ + CO₂.

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?

Which compound is insoluble in water?

How many moles are in 4.50 g of Na₂SO₄?

Essential Ideas

Atoms, Molecules, and Ions

Composition of Substances and Solutions

Thermochemistry

Electronic Structure and Periodic Properties of Elements

Chemical Bonding and Molecular Geometry

Advanced Theories of Covalent Bonding

Gases

Liquids and Solids

Solutions and Colloids

Kinetics

Fundamental Equilibrium Concepts

Acid-Base Equilibria

Thermodynamics

Electrochemistry

Representative Metals, Metalloids, and Nonmetals

Organic Chemistry

Nuclear Chemistry

Filters

Exam 4: Stoichiometry of Chemical Reactions

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

How is a liquid phase represented in a chemical reaction?

Classify the following type of reaction: Mgs) + 2HClaq) →\rightarrow→ MgCl2aq) + H2g).

Which of the following reactions are written correctly?

How many moles of HCl are needed to completely react with 50.0 mL of 0.250 M NaOH solution?

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

What is the product of hydrogen gas and oxygen gas?

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

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

How many μL are in 0.239 mL of solvent?

How many grams are in an 81 mg aspirin sample?

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

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?

Which of the following is a strong acid when mixed in water?

What is the percent yield of a reaction if the actual yield is 80.6 % of the 42.4 g theoretical yield?

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? Paired item 1)

Balance the following reaction: CaO + C →\rightarrow→ CaC2 + CO2.

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?

Which compound is insoluble in water?

How many moles are in 4.50 g of Na2SO4?

Essential Ideas

Atoms, Molecules, and Ions

Composition of Substances and Solutions

Thermochemistry

Electronic Structure and Periodic Properties of Elements

Chemical Bonding and Molecular Geometry

Advanced Theories of Covalent Bonding

Gases

Liquids and Solids

Solutions and Colloids

Kinetics

Fundamental Equilibrium Concepts

Acid-Base Equilibria

Thermodynamics

Electrochemistry

Representative Metals, Metalloids, and Nonmetals

Organic Chemistry

Nuclear Chemistry

Filters

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

Classify the following type of reaction: Mgs) + 2HClaq) $\rightarrow$ MgCl₂aq) + H₂g).

Balance the following reaction: CaO + C $\rightarrow$ CaC₂ + CO₂.

How many moles are in 4.50 g of Na₂SO₄?