Question 1

A 30.5 gram sample of glucose (C6H12O6)contains ________ atoms of carbon.

Accepted Answer

A) 9.17 × 1024 
B) 6.12 × 1023 
C) 1.70 × 1022 
D) 1.69 × 10-24 
E) 1.02

Question 2

Which one of the following substances is the product of this combination reaction? Al (s) + I2 (s) → ________

Accepted Answer

A) AlI2 
B) AlI 
C) AlI3 
D) Al2I3 
E) Al3I2

Question 3

When a hydrocarbon burns in air, what component of air reacts?

Accepted Answer

A) oxygen 
B) nitrogen 
C) carbon dioxide 
D) water 
E) argon

Question 4

When the following equation is balanced, the coefficient of Al2O3 is ________. Al2O3 (s) + C (s) + Cl2 (g) → AlCl3 (s) + CO (g)

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
E) 5

Question 5

When the following equation is balanced, the coefficient of oxygen is ________. PbS (s) + O2 (g) → PbO (s)+ SO2 (g)

Accepted Answer

A) 1 
B) 3 
C) 2 
D) 4 
E) 5

Question 6

The combustion of ammonia in the presence of excess oxygen yields NO2 and H2O: 4 NH3 (g) + 7 O2 (g) → 4 NO2 (g) + 6 H2O (g)
The combustion of 43.9 g of ammonia produces ________ g of NO2.

Accepted Answer

A) 2.58 
B) 178 
C) 119 
D) 0.954 
E) 43.9

Question 7

The formula weight of a substance is ________.

Accepted Answer

A) identical to the molar mass 
B) the same as the percent by mass weight 
C) determined by combustion analysis 
D) the sum of the atomic weights of each atom in its chemical formula 
E) the weight of a sample of the substance

Question 8

There are ________ molecules of methane in 0.123 mol of methane (CH4).

Accepted Answer

A) 5 
B) 2.46 × 10-2 
C) 2.04 × 10-25 
D) 7.40 × 1022 
E) 0.615

Question 9

When the following equation is balanced, the coefficient of HCl is ________. CaCO3 (s) + HCl (aq) → CaCl2 (aq) + CO2 (g) + H2O (l)

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
E) 0

Question 10

One mole of ________ contains the largest number of atoms.

Accepted Answer

A) S8 
B) C10H8 
C) Al2(SO4)3 
D) Na3PO4 
E) Cl2

Question 11

When the following equation is balanced, the coefficient of water is ________. N2O5 (g) + H2O (l) → HNO3 (aq)

Accepted Answer

A) 5 
B) 2 
C) 3 
D) 4 
E) 1

Question 12

The quantity of product that is calculated to form when all of the limiting reagent reacts is called the actual yield.

Accepted Answer

A) True 
 B)False

Question 13

A sample of CH4O with a mass of 32.0 g contains ________ molecules of CH4O.

Accepted Answer

A) 5.32 × 10-23 
B) 1.00 
C) 1.88 × 1022 
D) 6.02 × 1023 
E) 32.0

Question 14

There are ________ sulfur atoms in 25 molecules of C4H4S2.

Accepted Answer

A) 1.5 × 1025 
B) 4.8 × 1025 
C) 3.0 × 1025 
D) 50 
E) 6.02 × 1023

Question 15

When the following equation is balanced, the coefficient of H2S is ________. FeCl3 (aq) + H2S (g) → Fe2S3 (s) + HCl (aq)

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 5 
E) 4

Question 16

Predict the product in the combination reaction below. Al (s) + N2 (g) → ________

Accepted Answer

A) AlN 
B) Al3N 
C) AlN2 
D) Al3N2 
E) AlN3

Question 17

Of the reactions below, which one is a decomposition reaction?

Accepted Answer

A) NH4Cl → NH3 + HCl 
B) 2Mg + O2 → 2MgO 
C) 2N2 + 3H2 → 2NH3 
D) 2CH4 + 4O2 → 2CO2 + 4H2O 
E) Cd(NO3)2 + Na2S → CdS + 2NaNO3

Question 18

How many moles of magnesium oxide are produced by the reaction of 3.82 g of magnesium nitride with 7.73 g of water? Mg3N2 + 3H2O → 2NH3 + 3MgO

Accepted Answer

A) 0.114 
B) 0.0378 
C) 0.429 
D) 0.0756 
E) 4.57

Question 19

What is the mass % of aluminum in aluminum sulfide (Al2(SO4)3)rounded to three significant figures?

Accepted Answer

A) 7.90 
B) 23.7 
C) 15.8 
D) 31.6 
E) 342.2

Question 20

The formula weight of potassium dichromate (K2Cr2O7 )is ________ amu.

Accepted Answer

A) 107.09 
B) 255.08 
C) 242.18 
D) 294.18 
E) 333.08

Exam 3: Stoichiometry: Calculations With Chemical Formulas and Equations

A 30.5 gram sample of glucose (C₆H₁₂O₆) contains ________ atoms of carbon.

Which one of the following substances is the product of this combination reaction? Al (s) + I₂ (s) → ________

When a hydrocarbon burns in air, what component of air reacts?

When the following equation is balanced, the coefficient of Al₂O₃ is ________. Al₂O₃ (s) + C (s) + Cl₂ (g) → AlCl₃ (s) + CO (g)

When the following equation is balanced, the coefficient of oxygen is ________. PbS (s) + O₂ (g) → PbO (s) + SO₂ (g)

The combustion of ammonia in the presence of excess oxygen yields NO₂ and H₂O: 4 NH₃ (g) + 7 O₂ (g) → 4 NO₂ (g) + 6 H₂O (g) The combustion of 43.9 g of ammonia produces ________ g of NO₂.

The formula weight of a substance is ________.

There are ________ molecules of methane in 0.123 mol of methane (CH₄) .

When the following equation is balanced, the coefficient of HCl is ________. CaCO₃ (s) + HCl (aq) → CaCl₂ (aq) + CO₂ (g) + H₂O (l)

One mole of ________ contains the largest number of atoms.

When the following equation is balanced, the coefficient of water is ________. N₂O₅ (g) + H₂O (l) → HNO₃ (aq)

The quantity of product that is calculated to form when all of the limiting reagent reacts is called the actual yield.

A sample of CH₄O with a mass of 32.0 g contains ________ molecules of CH₄O.

There are ________ sulfur atoms in 25 molecules of C₄H₄S₂.

When the following equation is balanced, the coefficient of H₂S is ________. FeCl₃ (aq) + H₂S (g) → Fe₂S₃ (s) + HCl (aq)

Predict the product in the combination reaction below. Al (s) + N₂ (g) → ________

Of the reactions below, which one is a decomposition reaction?

How many moles of magnesium oxide are produced by the reaction of 3.82 g of magnesium nitride with 7.73 g of water? Mg₃N₂ + 3H₂O → 2NH₃ + 3MgO

What is the mass % of aluminum in aluminum sulfide (Al₂(SO₄) ₃) rounded to three significant figures?

The formula weight of potassium dichromate (K₂Cr₂O₇ ) is ________ amu.

Exam 3: Stoichiometry: Calculations With Chemical Formulas and Equations

A 30.5 gram sample of glucose (C6H12O6) contains ________ atoms of carbon.

Which one of the following substances is the product of this combination reaction? Al (s) + I2 (s) → ________

When a hydrocarbon burns in air, what component of air reacts?

When the following equation is balanced, the coefficient of Al2O3 is ________. Al2O3 (s) + C (s) + Cl2 (g) → AlCl3 (s) + CO (g)

When the following equation is balanced, the coefficient of oxygen is ________. PbS (s) + O2 (g) → PbO (s) + SO2 (g)

The combustion of ammonia in the presence of excess oxygen yields NO2 and H2O: 4 NH3 (g) + 7 O2 (g) → 4 NO2 (g) + 6 H2O (g) The combustion of 43.9 g of ammonia produces ________ g of NO2.

The formula weight of a substance is ________.

There are ________ molecules of methane in 0.123 mol of methane (CH4) .

When the following equation is balanced, the coefficient of HCl is ________. CaCO3 (s) + HCl (aq) → CaCl2 (aq) + CO2 (g) + H2O (l)

One mole of ________ contains the largest number of atoms.

When the following equation is balanced, the coefficient of water is ________. N2O5 (g) + H2O (l) → HNO3 (aq)

The quantity of product that is calculated to form when all of the limiting reagent reacts is called the actual yield.

A sample of CH4O with a mass of 32.0 g contains ________ molecules of CH4O.

There are ________ sulfur atoms in 25 molecules of C4H4S2.

When the following equation is balanced, the coefficient of H2S is ________. FeCl3 (aq) + H2S (g) → Fe2S3 (s) + HCl (aq)

Predict the product in the combination reaction below. Al (s) + N2 (g) → ________

Of the reactions below, which one is a decomposition reaction?

How many moles of magnesium oxide are produced by the reaction of 3.82 g of magnesium nitride with 7.73 g of water? Mg3N2 + 3H2O → 2NH3 + 3MgO

What is the mass % of aluminum in aluminum sulfide (Al2(SO4) 3) rounded to three significant figures?

The formula weight of potassium dichromate (K2Cr2O7 ) is ________ amu.

A 30.5 gram sample of glucose (C₆H₁₂O₆) contains ________ atoms of carbon.

Which one of the following substances is the product of this combination reaction? Al (s) + I₂ (s) → ________

When the following equation is balanced, the coefficient of Al₂O₃ is ________. Al₂O₃ (s) + C (s) + Cl₂ (g) → AlCl₃ (s) + CO (g)

When the following equation is balanced, the coefficient of oxygen is ________. PbS (s) + O₂ (g) → PbO (s) + SO₂ (g)

The combustion of ammonia in the presence of excess oxygen yields NO₂ and H₂O: 4 NH₃ (g) + 7 O₂ (g) → 4 NO₂ (g) + 6 H₂O (g) The combustion of 43.9 g of ammonia produces ________ g of NO₂.

There are ________ molecules of methane in 0.123 mol of methane (CH₄) .

When the following equation is balanced, the coefficient of HCl is ________. CaCO₃ (s) + HCl (aq) → CaCl₂ (aq) + CO₂ (g) + H₂O (l)

When the following equation is balanced, the coefficient of water is ________. N₂O₅ (g) + H₂O (l) → HNO₃ (aq)

A sample of CH₄O with a mass of 32.0 g contains ________ molecules of CH₄O.

There are ________ sulfur atoms in 25 molecules of C₄H₄S₂.

When the following equation is balanced, the coefficient of H₂S is ________. FeCl₃ (aq) + H₂S (g) → Fe₂S₃ (s) + HCl (aq)

Predict the product in the combination reaction below. Al (s) + N₂ (g) → ________

How many moles of magnesium oxide are produced by the reaction of 3.82 g of magnesium nitride with 7.73 g of water? Mg₃N₂ + 3H₂O → 2NH₃ + 3MgO

What is the mass % of aluminum in aluminum sulfide (Al₂(SO₄) ₃) rounded to three significant figures?

The formula weight of potassium dichromate (K₂Cr₂O₇ ) is ________ amu.