Question 1

In an exothermic reaction, heat is a product.

Accepted Answer

A) True 
 B)False  True

Question 2

When 85.0 g of CH₄ are mixed with 160. g of O2 the limiting reactant is CH₄ + 2O2 → CO2 + 2H2O

Accepted Answer

A) CH₄ 
B) O2. 
C) CO2. 
D) H2O. 
A) CH₄ 
B) O2. 
C) CO2. 
D) H2O. B

Question 3

How many moles of K₂ SO₄ are in 15.0 g of K₂ SO₄ ?

Accepted Answer

A) 0.172 moles 
B) 2.61 × 103 moles 
C) 0.111 moles 
D) 0.0861 moles 
E) 0.119 moles 
A) 0.172 moles 
B) 2.61 × 103 moles 
C) 0.111 moles 
D) 0.0861 moles 
E) 0.119 moles D

Question 4

What is the classification for this unbalanced reaction? 
Fe + HCl → FeCl₃ + H2

Accepted Answer

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

Question 5

The ________ is the minimum energy needed for a chemical reaction to begin.

Accepted Answer

A) reaction energy 
B) activation energy 
C) energy of reactants 
D) energy of products 
E) heat of reaction 
A) reaction energy 
B) activation energy 
C) energy of reactants 
D) energy of products 
E) heat of reaction

Question 6

For the question(s) that follow, consider the following balanced equation.
Mg₃NS1U1B12S1U1B0(s) + 6HS1U1B12S1U1B0O(l) → 3Mg (OH)₂(s) + 2NH₃(g)
-When 2 moles of Mg₃ N2 are allowed to react, how many moles of H2O also react?

Accepted Answer

A) 1 mole 
B) 4 moles 
C) 6 moles 
D) 8 moles 
E) 12 moles 
A) 1 mole 
B) 4 moles 
C) 6 moles 
D) 8 moles 
E) 12 moles

Question 7

Barium chloride and sodium sulfate react according to the following equation.
BaCl₂ + NaS1U1B12S1U1B0SO₄ → BaSO₄ + 2NaCl
Answer the question(s) that follow about this reaction.
-How many grams of barium chloride are needed to make 100. grams of barium sulfate?

Accepted Answer

A) 44.9 g 
B) 89.2 g 
C) 208.3 g 
D) 233.3 g 
E) 46.6 g 
A) 44.9 g 
B) 89.2 g 
C) 208.3 g 
D) 233.3 g 
E) 46.6 g

Question 8

A chemical equation is balanced when

Accepted Answer

A) the total number of molecules is the same in reactants and products. 
B) the total number of ions is the same in reactants and products. 
C) the sum of the coefficients of the reactants is equal to the sum of the coefficients of the products. 
D) the number of atoms of each element is the same in reactants and products. 
E) the charge on each atom is the same in reactants and products. 
A) the total number of molecules is the same in reactants and products. 
B) the total number of ions is the same in reactants and products. 
C) the sum of the coefficients of the reactants is equal to the sum of the coefficients of the products. 
D) the number of atoms of each element is the same in reactants and products. 
E) the charge on each atom is the same in reactants and products.

Question 9

What is the molar mass of copper(II) sulfate, CuSO4 ?

Accepted Answer

A) 16.0 g 
B) 63.6 g 
C) 111.6 g 
D) 159.6 g 
E) 319.2 g 
A) 16.0 g 
B) 63.6 g 
C) 111.6 g 
D) 159.6 g 
E) 319.2 g

Question 10

In the following reaction, when the equation is correctly balanced, what is the correct coefficient for aluminum chloride? 
Al(s) + Cl₂(g) → AlCl₃(s)

Accepted Answer

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

Question 11

In this reaction, what is the substance oxidized? 
Zn(s) + 2 HCl(aq) → ZnCl₂(aq) + H2(g)

Accepted Answer

A) chlorine 
B) zinc chloride 
C) hydrogen 
D) zinc 
E) oxygen 
A) chlorine 
B) zinc chloride 
C) hydrogen 
D) zinc 
E) oxygen

Question 12

The reaction of carbon with oxygen to produce carbon monoxide is an example of which class of reaction? 
2C(s) + O2(g) → 2CO(g)

Accepted Answer

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

Question 13

3.00 moles of NO2 have a mass of

Accepted Answer

A) 138 g. 
B) 46.0 g. 
C) 30.0 g. 
D) 90.0 g. 
E) 45.0 g. 
A) 138 g. 
B) 46.0 g. 
C) 30.0 g. 
D) 90.0 g. 
E) 45.0 g.

Question 14

For the reaction: 2H2O(l) + 137 kcal → 2H2 (g) + O2 (g), how many kcal are needed to form 2.00 moles O2 (g)?

Accepted Answer

A) 68.5 kcal 
B) 137 kcal 
C) 274 kcal 
D) 190. kcal 
E) 548 kcal 
A) 68.5 kcal 
B) 137 kcal 
C) 274 kcal 
D) 190. kcal 
E) 548 kcal

Question 15

The molar mass of copper(II) nitrate, Cu(NO₃)₂ is ________.

Accepted Answer

The answer of The molar mass of copper(II) nitrate, Cu(NO₃)₂...

Question 16

What is the mass of 1 mole of helium gas?

Accepted Answer

The answer of What is the mass of 1 mole...

Question 17

The number of particles in 1 mole of hydrogen gas is ________.

Accepted Answer

The answer of The number of particles in 1 mole...

Question 18

How many grams of N2 are produced from 100. g of NH₃ in the following reaction? 
4NH₃(g) + 6NO(g) → 5N2(g) + 6H2O(l)

Accepted Answer

A) 165 g 
B) 132 g 
C) 125 g 
D) 206 g 
E) 7.35 g 
A) 165 g 
B) 132 g 
C) 125 g 
D) 206 g 
E) 7.35 g

Question 19

Answer the question(s) that follow about the following reaction.
2HS1U1B12S1U1B0OS1U1B12S1U1B0 → 2HS1U1B12S1U1B0O + OS1U1B12S1U1B0
-How many moles of hydrogen peroxide (H2O2) are needed to produce 5.0 moles of water?

Accepted Answer

A) 1.0 mole 
B) 2.0 moles 
C) 4.0 moles 
D) 5.0 moles 
E) 8.0 moles 
A) 1.0 mole 
B) 2.0 moles 
C) 4.0 moles 
D) 5.0 moles 
E) 8.0 moles

Question 20

1.25 moles of PbO2 have a mass of

Accepted Answer

A) 191 g. 
B) 279 g. 
C) 178 g. 
D) 239 g. 
E) 299 g. 
A) 191 g. 
B) 279 g. 
C) 178 g. 
D) 239 g. 
E) 299 g.

Exam 7: Chemical Reactions and Quantities

In an exothermic reaction, heat is a product.

When 85.0 g of CH₄ are mixed with 160. g of O2 the limiting reactant is CH₄ + 2O2 → CO2 + 2H2O

How many moles of K₂ SO₄ are in 15.0 g of K₂ SO₄ ?

What is the classification for this unbalanced reaction? Fe + HCl → FeCl₃ + H2

The ________ is the minimum energy needed for a chemical reaction to begin.

For the question(s) that follow, consider the following balanced equation. Mg₃N2(s) + 6H2O(l) → 3Mg (OH)₂(s) + 2NH₃(g) -When 2 moles of Mg₃ N2 are allowed to react, how many moles of H2O also react?

Barium chloride and sodium sulfate react according to the following equation. BaCl₂ + Na2SO₄ → BaSO₄ + 2NaCl Answer the question(s) that follow about this reaction. -How many grams of barium chloride are needed to make 100. grams of barium sulfate?

A chemical equation is balanced when

What is the molar mass of copper(II) sulfate, CuSO4 ?

In the following reaction, when the equation is correctly balanced, what is the correct coefficient for aluminum chloride? Al(s) + Cl₂(g) → AlCl₃(s)

In this reaction, what is the substance oxidized? Zn(s) + 2 HCl(aq) → ZnCl₂(aq) + H2(g)

The reaction of carbon with oxygen to produce carbon monoxide is an example of which class of reaction? 2C(s) + O2(g) → 2CO(g)

3.00 moles of NO2 have a mass of

For the reaction: 2H2O(l) + 137 kcal → 2H2 (g) + O2 (g), how many kcal are needed to form 2.00 moles O2 (g)?

The molar mass of copper(II) nitrate, Cu(NO₃)₂ is ________.

What is the mass of 1 mole of helium gas?

The number of particles in 1 mole of hydrogen gas is ________.

How many grams of N2 are produced from 100. g of NH₃ in the following reaction? 4NH₃(g) + 6NO(g) → 5N2(g) + 6H2O(l)

Answer the question(s) that follow about the following reaction. 2H2O2 → 2H2O + O2 -How many moles of hydrogen peroxide (H2O2) are needed to produce 5.0 moles of water?

1.25 moles of PbO2 have a mass of

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When 85.0 g of CH₄ are mixed with 160. g of O₂ the limiting reactant is CH₄ + 2O₂ → CO₂ + 2H₂O

What is the classification for this unbalanced reaction? Fe + HCl → FeCl₃ + H₂

For the question(s) that follow, consider the following balanced equation. Mg₃N₂(s) + 6H₂O(l) → 3Mg (OH)₂(s) + 2NH₃(g) -When 2 moles of Mg₃ N₂ are allowed to react, how many moles of H₂O also react?

Barium chloride and sodium sulfate react according to the following equation. BaCl₂ + Na₂SO₄ → BaSO₄ + 2NaCl Answer the question(s) that follow about this reaction. -How many grams of barium chloride are needed to make 100. grams of barium sulfate?

What is the molar mass of copper(II) sulfate, CuSO₄ ?

In this reaction, what is the substance oxidized? Zn(s) + 2 HCl(aq) → ZnCl₂(aq) + H₂(g)

The reaction of carbon with oxygen to produce carbon monoxide is an example of which class of reaction? 2C(s) + O₂(g) → 2CO(g)

3.00 moles of NO₂ have a mass of

For the reaction: 2H₂O(l) + 137 kcal → 2H₂ (g) + O₂ (g), how many kcal are needed to form 2.00 moles O₂ (g)?

How many grams of N₂ are produced from 100. g of NH₃ in the following reaction? 4NH₃(g) + 6NO(g) → 5N₂(g) + 6H₂O(l)

Answer the question(s) that follow about the following reaction. 2H₂O₂ → 2H₂O + O₂ -How many moles of hydrogen peroxide (H₂O₂) are needed to produce 5.0 moles of water?

1.25 moles of PbO₂ have a mass of