Question 1

How many grams of water (H2O) are produced when 2 moles of glucose (C6H12O6) are completely oxidized according to the equation: C6H12O6 + 6O2 -> 6CO2 + 6H2O?

Accepted Answer

108 grams

Answer

360 grams

Answer

18 grams

Answer

216 grams

Question 2

How many liters of carbon dioxide (CO2) are produced at STP when 1 mole of propane (C3H8) is combusted completely according to the equation: C3H8 + 5O2 -> 3CO2 + 4H2O?

Accepted Answer

67.2 liters

Answer

22.4 liters

Answer

89.6 liters

Answer

44.8 liters

Question 3

If 2.0 moles of aluminum (Al) react with excess hydrochloric acid (HCl) according to the reaction 2Al + 6HCl -> 2AlCl3 + 3H2, how many moles of hydrogen gas (H2) are produced?

Accepted Answer

3.0 moles

Answer

6.0 moles

Answer

4.5 moles

Answer

1.5 moles

Question 4

What volume of CO2 (at STP) is produced when 12 grams of carbon (C) are completely combusted in excess oxygen according to the equation: C + O2 -> CO2?

Accepted Answer

22.4 liters

Answer

33.6 liters

Answer

11.2 liters

Answer

44.8 liters

Question 5

What is the mass in grams of sodium chloride (NaCl) produced when 2.5 moles of sodium (Na) react completely with chlorine gas (Cl2) according to the equation: 2Na + Cl2 -> 2NaCl?

Accepted Answer

146.5 grams

Answer

73.25 grams

Answer

117 grams

Answer

58.5 grams

Question 6

What is the maximum number of moles of ammonia (NH3) that can be produced when 3 moles of nitrogen (N2) react with 9 moles of hydrogen (H2) according to the equation: N2 + 3H2 -> 2NH3?

Accepted Answer

6 moles

Answer

9 moles

Answer

3 moles

Answer

12 moles

Question 7

How many grams of NaCl are needed to react completely with 2.45 moles of AgNO3 according to the equation: NaCl + AgNO3 -> AgCl + NaNO3?

Accepted Answer

143.5 grams

Answer

231.76 grams

Answer

58.44 grams

Answer

116.88 grams

Question 8

How many grams of CO2 are produced when 32 grams of O2 react completely with an excess of carbon monoxide (CO) according to the equation: 2CO + O2 -> 2CO2?

Accepted Answer

88

Answer

44

Answer

32

Answer

64

Question 9

What is the mass of iron (Fe) needed to react completely with 32 grams of oxygen (O2) to form iron(III) oxide (Fe2O3) according to the reaction: 4Fe + 3O2 -> 2Fe2O3?

Accepted Answer

112

Answer

160

Answer

224

Answer

56

Question 10

If 5 moles of calcium carbonate (CaCO3) decompose to produce calcium oxide (CaO) and carbon dioxide (CO2) according to the equation: CaCO3 -> CaO + CO2, how many moles of carbon dioxide will be produced?

Accepted Answer

5

Answer

2.5

Answer

10

Answer

15

Question 11

What volume of hydrogen gas at standard temperature and pressure (STP) is produced when 2 moles of aluminum react with excess hydrochloric acid (HCl) according to the equation: 2Al + 6HCl -> 2AlCl3 + 3H2?

Accepted Answer

67.2

Answer

44.8

Answer

22.4

Answer

89.6

Question 12

If 24 grams of magnesium (Mg) react with excess hydrochloric acid (HCl) to produce magnesium chloride (MgCl2) and hydrogen gas (H2) according to the equation: Mg + 2HCl -> MgCl2 + H2, how many liters of hydrogen gas are produced at standard temperature and pressure (STP)?

Accepted Answer

24

Answer

36

Answer

12

Answer

48

Question 13

If 46 grams of sodium (Na) react with chlorine gas (Cl2) to form sodium chloride (NaCl) according to the equation: 2Na + Cl2 -> 2NaCl, how many grams of sodium chloride will be produced?

Accepted Answer

117

Answer

234

Answer

58.5

Answer

93

Question 14

How many grams of glucose (C6H12O6) are needed to produce 90 grams of carbon dioxide (CO2) through the complete combustion of glucose according to the equation: C6H12O6 + 6O2 -> 6CO2 + 6H2O?

Accepted Answer

60

Answer

120

Answer

90

Answer

30

Question 15

How many grams of water (H2O) are produced when 16 grams of methane (CH4) completely combusts in oxygen according to the equation: CH4 + 2O2 -> CO2 + 2H2O?

Accepted Answer

36

Answer

72

Answer

18

Answer

54

Question 16

If the balanced chemical equation predicts that

2.0

moles of a product should form, but only

1.5

moles are collected in the lab, what is the percent yield?

Accepted Answer

75%

Answer

0.75%

Answer

133%

Answer

33%

Question 17

A chemist attempts to produce

2.0

grams of silver chloride. Due to some product sticking to the filter paper during the collection process, the final mass is found to be

1.5

grams. What is the percent yield?

Accepted Answer

93.0%

Answer

107.5%

Answer

93.0 grams

Answer

7.0%

Question 18

Which of the following describes the 'theoretical yield' in a chemical reaction?

Accepted Answer

The maximum amount of product that can be formed based on stoichiometry.

Answer

The percentage of reactants that successfully turned into products.

Answer

The amount of leftover reactant after the reaction is complete.

Answer

The amount of product actually measured and collected in the lab.

Question 19

A student calculates that their chemical reaction should produce

2.0

grams of magnesium oxide. However, after performing the experiment and weighing the product, they only obtain

1.5

grams. What is the percent yield of this reaction?

Accepted Answer

81.6%

Answer

22.5%

Answer

122.5%

Answer

0.816%

Question 20

What is the percent composition by mass of phosphorus in phosphoric acid (

2.0

)? (Atomic masses:

1.5

g/mol,

P = 30.97

g/mol,

O = 16.00

g/mol)

Accepted Answer

31.6%

Answer

3.1%

Answer

24.5%

Answer

65.3%

Question 21

What is the percent composition by mass of aluminum in aluminum oxide (

2.0

)? (Atomic masses:

1.5

g/mol,

P = 30.97

g/mol)

Accepted Answer

52.9%

Answer

62.8%

Answer

26.5%

Answer

47.1%

Question 22

What is the percent composition by mass of oxygen in iron(III) oxide (

2.0

)? (Atomic masses:

1.5

g/mol,

P = 30.97

g/mol)

Accepted Answer

30.1%

Answer

48.0%

Answer

69.9%

Answer

22.3%

Question 23

What is the percent composition by mass of nitrogen in ammonium nitrate (

2.0

)? (Atomic masses:

1.5

g/mol,

P = 30.97

g/mol,

O = 16.00

g/mol)

Accepted Answer

35.0%

Answer

22.3%

Answer

28.0%

Answer

17.5%

Question 24

What is the molar mass of ethanol,

2.0

? (Atomic masses:

1.5

,

P = 30.97

,

O = 16.00

).

Accepted Answer

46.08 g/mol

Answer

30.03 g/mol

Answer

45.07 g/mol

Answer

52.12 g/mol

Question 25

What is the molar mass of aluminum oxide,

2.0

? (Atomic masses:

1.5

,

P = 30.97

).

Accepted Answer

101.96 g/mol

Answer

42.98 g/mol

Answer

123.94 g/mol

Answer

69.96 g/mol

Question 26

What is the molar mass of ammonium phosphate,

2.0

? (Atomic masses:

1.5

,

P = 30.97

,

O = 16.00

,

O = 16.00 	ext{ g/mol}

).

Accepted Answer

149.12 g/mol

Answer

121.05 g/mol

Answer

113.12 g/mol

Answer

161.12 g/mol

Question 27

What is the molar mass of silver carbonate,

2.0

? (Atomic masses:

1.5

,

P = 30.97

,

O = 16.00

).

Accepted Answer

275.75 g/mol

Answer

135.88 g/mol

Answer

231.75 g/mol

Answer

287.75 g/mol

Question 28

Which of the following describes the effect of a catalyst on the activation energy (

2.0

) of a chemical reaction?

Accepted Answer

It provides an alternative reaction pathway with a lower activation energy.

Answer

It changes the enthalpy change (

2.0

) of the reaction.

Answer

It increases the kinetic energy of the reactant particles.

Answer

It raises the activation energy to make the transition state more stable.

Question 29

On a potential energy diagram, how is the activation energy of the forward reaction measured?

Accepted Answer

The energy difference between the reactants and the transition state.

Answer

The total energy of the products.

Answer

The energy difference between the transition state and the products.

Answer

The energy difference between the reactants and the products.

Question 30

According to collision theory, why does increasing the temperature typically increase the rate of a reaction?

Accepted Answer

A greater fraction of molecules possess kinetic energy equal to or greater than the activation energy.

Answer

The activation energy of the reaction is lowered as the temperature rises.

Answer

The enthalpy change of the reaction becomes more exothermic, releasing more energy.

Answer

The molecules expand in size, making them more likely to hit each other.

Question 31

The combustion of methane is represented by the equation:

2.0

with

1.5

. How much heat is released when

P = 30.97

moles of methane are burned completely?

Accepted Answer

Answer

Answer

Answer

Question 32

Which of the following processes always results in a positive enthalpy change (

2.0

)?

Accepted Answer

Sublimation of a solid into a gas

Answer

Freezing of liquid water into ice

Answer

Deposition of a gas into a solid

Answer

Condensation of water vapor into liquid

Question 33

Which of the following describes the enthalpy change of a reaction where the chemical bonds in the products are stronger and more stable than the chemical bonds in the reactants?

Accepted Answer

The reaction is exothermic and

2.0

is negative.

Answer

The reaction is exothermic and

2.0

is positive.

Answer

The reaction is endothermic and

2.0

is positive.

Answer

The reaction is endothermic and

2.0

is negative.

Question 34

Given the equation

2.0

with an enthalpy change of

1.5

, what is the enthalpy change for the reverse reaction

P = 30.97

?

Accepted Answer

Answer

Answer

Answer

Question 35

In a chemical reaction, if the enthalpy of the products is

2.0

and the enthalpy of the reactants is

1.5

, what is the change in enthalpy (

P = 30.97

) and the type of reaction?

Accepted Answer

1780 kJ

; Exothermic

Answer

1780 kJ

; Exothermic

Answer

1780 kJ

; Endothermic

Answer

1780 kJ

; Endothermic

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