Question 1

Which of the following correctly gives the best coefficients for the reaction below? N2H₄ + H2O2 → N2 + H2O

Accepted Answer

A) 1, 1, 1 ,1 
B) 1, 2, 1, 4 
C) 2, 4, 2, 8 
D) 1, 4, 1, 4 
E) 2, 4, 2, 4 
A) 1, 1, 1 ,1 
B) 1, 2, 1, 4 
C) 2, 4, 2, 8 
D) 1, 4, 1, 4 
E) 2, 4, 2, 4

Question 2

How many atoms of neon are present in 1.30 moles of neon?

Accepted Answer

A) 3.15 × 1023 atoms 
B) 4.63 × 1023 atoms 
C) 7.83 × 1023 atoms 
D) 6.02 × 1023 atoms 
E) 7.83 × 1024 atoms 
A) 3.15 × 1023 atoms 
B) 4.63 × 1023 atoms 
C) 7.83 × 1023 atoms 
D) 6.02 × 1023 atoms 
E) 7.83 × 1024 atoms

Question 3

Pentane (CS1U1B15S1U1B0HS1U1B112S1U1B0) reacts with oxygen (OS1U1B12S1U1B0) to form carbon dioxide (COS1U1B12S1U1B0) and water (HS1U1B12S1U1B0O) according to the following reaction. Answer the question(s) that follow about this reaction.
CS1U1B15S1U1B0HS1U1B112S1U1B0 + ? OS1U1B12S1U1B0 → ? COS1U1B12S1U1B0 + ? HS1U1B12S1U1B0O
-What is the coefficient for oxygen in the balanced equation?

Accepted Answer

A) 2 
B) 4 
C) 5 
D) 6 
E) 8 
A) 2 
B) 4 
C) 5 
D) 6 
E) 8

Question 4

What is the classification for this reaction? 
SO₃ (g) + H2O (l) → H2SO₄(l)

Accepted Answer

A) decomposition 
B) combination 
C) replacement 
D) double replacement 
E) oxidation reduction 
A) decomposition 
B) combination 
C) replacement 
D) double replacement 
E) oxidation reduction

Question 5

When 85.0 g of CH4 are mixed with 160. g of O2 what is the maximum amount of CO2 that can be produced? CH₄ + 2O2 → CO2 + 2H2O

Accepted Answer

A) 2.50 moles 
B) 5.00 moles 
C) 5.31 moles 
D) 7.81 moles 
A) 2.50 moles 
B) 5.00 moles 
C) 5.31 moles 
D) 7.81 moles

Question 6

A reaction that releases energy as it occurs is classified as a(n)

Accepted Answer

A) endothermic reaction. 
B) exothermic reaction. 
C) oxidation-reduction reaction. 
D) catalyzed reaction. 
E) decomposition reaction. 
A) endothermic reaction. 
B) exothermic reaction. 
C) oxidation-reduction reaction. 
D) catalyzed reaction. 
E) decomposition reaction.

Question 7

In a ________ reaction, two or more elements or compounds form one product.

Accepted Answer

A) decomposition 
B) single replacement 
C) dehydration 
D) double replacement 
E) combination 
A) decomposition 
B) single replacement 
C) dehydration 
D) double replacement 
E) combination

Question 8

When 4 moles of aluminum are allowed to react with an excess of chlorine gas, Cl₂ , how many moles of aluminum chloride are produced?

Accepted Answer

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

Question 9

For the question(s) that follow, consider the following balanced equation.
MgS1U1B13S1U1B0NS1U1B12S1U1B0(s) + 6HS1U1B12S1U1B0O(l) → 3Mg (OH)₂(s) + 2NH₃(g)
-When 36.0 g of H2O react, how many grams of NH₃ are produced?

Accepted Answer

A) 34.0 g 
B) 10.0 g 
C) 5.67 g 
D) 11.3 g 
E) 102 g 
A) 34.0 g 
B) 10.0 g 
C) 5.67 g 
D) 11.3 g 
E) 102 g

Question 10

What coefficient is placed in front of O2 to complete the balancing of the following equation? C5H8 + ? O2 → 5CO2 + 4H2O

Accepted Answer

A) 1 
B) 3 
C) 5 
D) 7 
E) 9 
A) 1 
B) 3 
C) 5 
D) 7 
E) 9

Question 11

The molar mass of magnesium is 24.3 g.

Accepted Answer

A) True 
 B)False

Question 12

In the following reaction, when the equation is correctly balanced, what is the correct coefficient for H2?
 Fe(s) + HCl(aq) → FeCl₃(aq) + H2(g)

Accepted Answer

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

Question 13

The reaction of methane with oxygen to produce carbon dioxide and water is an example of which class of reaction? 
CH₄(g) + 2O2(g) → CO2(g) + 2H2O(g)

Accepted Answer

A) single replacement 
B) double replacement 
C) combination 
D) oxidation 
E) endothermic 
A) single replacement 
B) double replacement 
C) combination 
D) oxidation 
E) endothermic

Question 14

What type of reaction is the following? 
2KClO₃ → 2KCl + 3O2

Accepted Answer

decomposit

Which of the following correctly gives the best coefficients for the reaction below? N₂H₄ + H₂O₂ → N₂ + H₂O

How many atoms of neon are present in 1.30 moles of neon?

Pentane (C₅H₁₂) reacts with oxygen (O₂) to form carbon dioxide (CO₂) and water (H₂O) according to the following reaction. Answer the question(s) that follow about this reaction. C₅H₁₂ + ? O₂ → ? CO₂ + ? H₂O -What is the coefficient for oxygen in the balanced equation?

What is the classification for this reaction? SO₃ (g) + H₂O (l) → H₂SO₄(l)

When 85.0 g of CH₄ are mixed with 160. g of O₂ what is the maximum amount of CO₂ that can be produced? CH₄ + 2O₂ → CO₂ + 2H₂O

A reaction that releases energy as it occurs is classified as a(n)

In a ________ reaction, two or more elements or compounds form one product.

When 4 moles of aluminum are allowed to react with an excess of chlorine gas, Cl₂ , how many moles of aluminum chloride are produced?

For the question(s) that follow, consider the following balanced equation. Mg₃N₂(s) + 6H₂O(l) → 3Mg (OH)₂(s) + 2NH₃(g) -When 36.0 g of H₂O react, how many grams of NH₃ are produced?

What coefficient is placed in front of O₂ to complete the balancing of the following equation? C₅H₈ + ? O₂ → 5CO₂ + 4H₂O

The molar mass of magnesium is 24.3 g.

In the following reaction, when the equation is correctly balanced, what is the correct coefficient for H₂? Fe(s) + HCl(aq) → FeCl₃(aq) + H₂(g)

The reaction of methane with oxygen to produce carbon dioxide and water is an example of which class of reaction? CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(g)

What type of reaction is the following? 2KClO₃ → 2KCl + 3O₂

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Exam 7: Chemical Reactions and Quantities

Which of the following correctly gives the best coefficients for the reaction below? N2H₄ + H2O2 → N2 + H2O

How many atoms of neon are present in 1.30 moles of neon?

Pentane (C5H12) reacts with oxygen (O2) to form carbon dioxide (CO2) and water (H2O) according to the following reaction. Answer the question(s) that follow about this reaction. C5H12 + ? O2 → ? CO2 + ? H2O -What is the coefficient for oxygen in the balanced equation?

What is the classification for this reaction? SO₃ (g) + H2O (l) → H2SO₄(l)

When 85.0 g of CH4 are mixed with 160. g of O2 what is the maximum amount of CO2 that can be produced? CH₄ + 2O2 → CO2 + 2H2O

A reaction that releases energy as it occurs is classified as a(n)

In a ________ reaction, two or more elements or compounds form one product.

When 4 moles of aluminum are allowed to react with an excess of chlorine gas, Cl₂ , how many moles of aluminum chloride are produced?

For the question(s) that follow, consider the following balanced equation. Mg3N2(s) + 6H2O(l) → 3Mg (OH)₂(s) + 2NH₃(g) -When 36.0 g of H2O react, how many grams of NH₃ are produced?

What coefficient is placed in front of O2 to complete the balancing of the following equation? C5H8 + ? O2 → 5CO2 + 4H2O

The molar mass of magnesium is 24.3 g.

In the following reaction, when the equation is correctly balanced, what is the correct coefficient for H2? Fe(s) + HCl(aq) → FeCl₃(aq) + H2(g)

The reaction of methane with oxygen to produce carbon dioxide and water is an example of which class of reaction? CH₄(g) + 2O2(g) → CO2(g) + 2H2O(g)

What type of reaction is the following? 2KClO₃ → 2KCl + 3O2

Chemistry in Our Lives

Chemistry and Measurements

Energy and Matter

Atoms

Nuclear Chemistry

Ionic and Molecular Compounds

Gases

Solutions

Reaction Rates and Chemical Equilibrium

Acids and Bases

Introduction to Organic Chemistry: Hydrocarbons

Alcohols, Phenols, Thiols, and Ethers

Aldehydes, Ketones, and Chiral Molecules

Carbohydrates

Carboxylic Acids and Esters

Lipids

Amines and Amides

Amino Acids and Proteins

Enzymes and Vitamins

Nucleic Acids and Protein Synthesis

Metabolic Pathways for Carbohydrates

Metabolism and Energy Production

Metabolic Pathways for Lipids and Amino Acids

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Which of the following correctly gives the best coefficients for the reaction below? N₂H₄ + H₂O₂ → N₂ + H₂O

Pentane (C₅H₁₂) reacts with oxygen (O₂) to form carbon dioxide (CO₂) and water (H₂O) according to the following reaction. Answer the question(s) that follow about this reaction. C₅H₁₂ + ? O₂ → ? CO₂ + ? H₂O -What is the coefficient for oxygen in the balanced equation?

What is the classification for this reaction? SO₃ (g) + H₂O (l) → H₂SO₄(l)

When 85.0 g of CH₄ are mixed with 160. g of O₂ what is the maximum amount of CO₂ that can be produced? CH₄ + 2O₂ → CO₂ + 2H₂O

For the question(s) that follow, consider the following balanced equation. Mg₃N₂(s) + 6H₂O(l) → 3Mg (OH)₂(s) + 2NH₃(g) -When 36.0 g of H₂O react, how many grams of NH₃ are produced?

What coefficient is placed in front of O₂ to complete the balancing of the following equation? C₅H₈ + ? O₂ → 5CO₂ + 4H₂O

In the following reaction, when the equation is correctly balanced, what is the correct coefficient for H₂? Fe(s) + HCl(aq) → FeCl₃(aq) + H₂(g)

The reaction of methane with oxygen to produce carbon dioxide and water is an example of which class of reaction? CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(g)

What type of reaction is the following? 2KClO₃ → 2KCl + 3O₂