Question 1

When a hydrocarbon burns in air,a component produced is ________.

Accepted Answer

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

Question 2

The molecular weight of 2-propanol ( C3H7OH ),known as rubbing alcohol,is ________ amu (rounded to one decimal place).

Accepted Answer

A) 59.1 
B) 29.0 
C) 60.1 
D) 12.0 
E) 34.0 
A) 59.1 
B) 29.0 
C) 60.1 
D) 12.0 
E) 34.0

Question 3

What is the mass in grams of 2.00 × 105 atoms of naturally occurring neon?

Accepted Answer

A) 6.08 × 1019 
B) 2.43 × 1030 
C) 6.70 × 10-18 
D) 1.65 × 10-20 
E) 3.32 × 10-24 
A) 6.08 × 1019 
B) 2.43 × 1030 
C) 6.70 × 10-18 
D) 1.65 × 10-20 
E) 3.32 × 10-24

Question 4

There are ________ atoms of oxygen in 300 molecules of CH3CO2H.

Accepted Answer

A) 300 
B) 600 
C) 150 
D) 3.6 × 1026 
E) 1.0 × 10-22 
A) 300 
B) 600 
C) 150 
D) 3.6 × 1026 
E) 1.0 × 10-22

Question 5

Pentacarbonyliron (Fe(CO)5)reacts with phosphorous trifluoride (PF3)and hydrogen,releasing carbon monoxide: Fe(CO)5 + PF3 + H2 → Fe(CO)2(PF3)2(H)2 + CO (not balanced)
The reaction of 9.0 mol of Fe(CO)5,11.0 mol of PF3 and 3.0 mol of H2 will release ________ mol of CO.

Accepted Answer

A) 9 
B) 3 
C) 27 
D) 16.5 
E) 23 
A) 9 
B) 3 
C) 27 
D) 16.5 
E) 23

Question 6

What is the coefficient of O2 when the following equation is completed and balanced?
C4H8O2 + O2 → ________

Accepted Answer

A) 2 
B) 3 
C) 5 
D) 6 
E) 1 
A) 2 
B) 3 
C) 5 
D) 6 
E) 1

Question 7

The mass of a single atom of an element (in amu)is numerically equal to the mass in grams of that element.

Accepted Answer

A) True 
 B)False

Question 8

What is the empirical formula of a compound that is 66.6% C,11.2% H,and 22.2% O by mass?

Accepted Answer

A)      
B)      
C)        
D)        
E)        
A)      
B)      
C)        
D)        
E)

Question 9

How many moles of carbon monoxide are there in 36.55 g of carbon monoxide?

Accepted Answer

A) 1.023 
B) 1.305 
C) 0.8307 
D) 0.7761 
E) 1023 
A) 1.023 
B) 1.305 
C) 0.8307 
D) 0.7761 
E) 1023

Question 10

What is the formula weight of lead iodide (PbI2)?

Accepted Answer

A) 334.1 
B) 168.7 
C) 295.6 
D) 461.0 
E) 668.2 
A) 334.1 
B) 168.7 
C) 295.6 
D) 461.0 
E) 668.2

Question 11

The molecular weight of the acetic acid (CH3CO2H),rounded to the nearest integer,is ________ amu.

Accepted Answer

A) 60 
B) 48 
C) 44 
D) 32 
A) 60 
B) 48 
C) 44 
D) 32

Question 12

The balanced equation for the decomposition of sodium azide is ________.

Accepted Answer

A) 2NaN3 (s)→ 2Na (s)+ 3N2 (g) 
B) 2NaN3 (s)→ Na2 (s)+ 3N2 (g) 
C) NaN3 (s)→ Na (s)+ N2 (g) 
D) NaN3 (s)→ Na (s)+ N2 (g)+ N (g) 
E) 2NaN3 (s)→ 2Na (s)+ 2N2 (g) 
A) 2NaN3 (s)→ 2Na (s)+ 3N2 (g) 
B) 2NaN3 (s)→ Na2 (s)+ 3N2 (g) 
C) NaN3 (s)→ Na (s)+ N2 (g) 
D) NaN3 (s)→ Na (s)+ N2 (g)+ N (g) 
E) 2NaN3 (s)→ 2Na (s)+ 2N2 (g)

Question 13

Magnesium burns in air with a dazzling brilliance to produce magnesium oxide: 2Mg (s)+ O2 (g)→ 2MgO (s)
When 5.50 g of magnesium burns,the theoretical yield of magnesium oxide is ________ g.

Accepted Answer

A) 5.50 
B) 9.12 
C) 0.226 
D) 4.56 
E) 18.2 
A) 5.50 
B) 9.12 
C) 0.226 
D) 4.56 
E) 18.2

Question 14

A sample of C3H8O that contains 200 molecules contains ________ carbon atoms.

Accepted Answer

A) 600 
B) 200 
C) 3.61 × 1026 
D) 1.20 × 1026 
E) 4.01 × 1025 
A) 600 
B) 200 
C) 3.61 × 1026 
D) 1.20 × 1026 
E) 4.01 × 1025

Question 15

Complete and balance the following reaction,given that elemental sodium reacts with elemental oxygen to form Na2O (s).
K (s)+ S (s)→ ________

Accepted Answer

Question 16

A sample of CH2F2 with a mass of 19 g contains ________ atoms of F.

Accepted Answer

A) 2.2 × 1023 
B) 38 
C) 3.3 × 1024 
D) 4.4 × 1023 
E) 9.5 
A) 2.2 × 1023 
B) 38 
C) 3.3 × 1024 
D) 4.4 × 1023 
E) 9.5

Question 17

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 
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 18

Under appropriate conditions,nitrogen and hydrogen undergo a combination reaction to yield ammonia.Write the reaction and determine the mass of H2 (g)required to completely react with 25.8 g of N2.

Accepted Answer

A) 5.57 
B) 1.86 
C) 77.4 
D) 2.78 
E) 0.928 
A) 5.57 
B) 1.86 
C) 77.4 
D) 2.78 
E) 0.928

Exam 3: Chemical Reactions and Reaction Stoichiometry

When a hydrocarbon burns in air,a component produced is ________.

The molecular weight of 2-propanol ( C3H7OH ),known as rubbing alcohol,is ________ amu (rounded to one decimal place).

What is the mass in grams of 2.00 × 105 atoms of naturally occurring neon?

There are ________ atoms of oxygen in 300 molecules of CH3CO2H.

Pentacarbonyliron (Fe(CO)5)reacts with phosphorous trifluoride (PF3)and hydrogen,releasing carbon monoxide: Fe(CO)5 + PF3 + H2 → Fe(CO)2(PF3)2(H)2 + CO (not balanced) The reaction of 9.0 mol of Fe(CO)5,11.0 mol of PF3 and 3.0 mol of H2 will release ________ mol of CO.

What is the coefficient of O2 when the following equation is completed and balanced? C4H8O2 + O2 → ________

The mass of a single atom of an element (in amu)is numerically equal to the mass in grams of that element.

What is the empirical formula of a compound that is 66.6% C,11.2% H,and 22.2% O by mass?

How many moles of carbon monoxide are there in 36.55 g of carbon monoxide?

What is the formula weight of lead iodide (PbI2)?

The molecular weight of the acetic acid (CH3CO2H),rounded to the nearest integer,is ________ amu.

The balanced equation for the decomposition of sodium azide is ________.

Magnesium burns in air with a dazzling brilliance to produce magnesium oxide: 2Mg (s)+ O2 (g)→ 2MgO (s) When 5.50 g of magnesium burns,the theoretical yield of magnesium oxide is ________ g.

A sample of C3H8O that contains 200 molecules contains ________ carbon atoms.

Complete and balance the following reaction,given that elemental sodium reacts with elemental oxygen to form Na2O (s). K (s)+ S (s)→ ________

A sample of CH2F2 with a mass of 19 g contains ________ atoms of F.

The formula weight of a substance is ________.

Under appropriate conditions,nitrogen and hydrogen undergo a combination reaction to yield ammonia.Write the reaction and determine the mass of H2 (g)required to completely react with 25.8 g of N2.

Introduction: Matter, energy, and Measurement

Atoms, molecules, and Ions

Reactions in Aqueous Solution

Thermochemistry

Electronic Structure of Atoms

Periodic Properties of the Elements

Basic Concepts of Chemical Bonding

Molecular Geometry and Bonding Theories

Gases

Liquids and Intermolecular Forces

Solids and Modern Materials

Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acid-Base Equilibria

Additional Aspects of Aqueous Equilibria

Chemistry of the Environment

Chemical Thermodynamics

Electrochemistry

Nuclear Chemistry

Chemistry of the Nonmetals

Transition Metals and Coordination Chemistry

The Chemistry of Life: Organic and Biological Chemistry

Filters

The molecular weight of 2-propanol ( C₃H₇OH ),known as rubbing alcohol,is ________ amu (rounded to one decimal place).

What is the mass in grams of 2.00 × 10⁵atoms of naturally occurring neon?

There are ________ atoms of oxygen in 300 molecules of CH₃CO₂H.

Pentacarbonyliron (Fe(CO)₅)reacts with phosphorous trifluoride (PF₃)and hydrogen,releasing carbon monoxide: Fe(CO)₅ + PF₃ + H₂ → Fe(CO)₂(PF₃)₂(H)₂ + CO (not balanced) The reaction of 9.0 mol of Fe(CO)₅,11.0 mol of PF₃ and 3.0 mol of H₂ will release ________ mol of CO.

What is the coefficient of O₂when the following equation is completed and balanced? C₄H₈O₂ + O₂→ ________

What is the formula weight of lead iodide (PbI₂)?

The molecular weight of the acetic acid (CH₃CO₂H),rounded to the nearest integer,is ________ amu.

Magnesium burns in air with a dazzling brilliance to produce magnesium oxide: 2Mg (s)+ O₂(g)→ 2MgO (s) When 5.50 g of magnesium burns,the theoretical yield of magnesium oxide is ________ g.

A sample of C₃H₈O that contains 200 molecules contains ________ carbon atoms.

Complete and balance the following reaction,given that elemental sodium reacts with elemental oxygen to form Na₂O (s). K (s)+ S (s)→ ________

A sample of CH₂F₂ with a mass of 19 g contains ________ atoms of F.

Under appropriate conditions,nitrogen and hydrogen undergo a combination reaction to yield ammonia.Write the reaction and determine the mass of H₂ (g)required to completely react with 25.8 g of N₂.