Question 1

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 2

Identify the energy associated with each of the labeled parts of the following diagram.

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

Accepted Answer

The answer of Identify the energy associated with each of...

Question 3

The molar mass of potassium is

Accepted Answer

A)  19 g. 
B)  31.0 g. 
C)  6.02 × 1023 grams. 
D)  39.1 g. 
E)  15g. 
A)  19 g. 
B)  31.0 g. 
C)  6.02 × 1023 grams. 
D)  39.1 g. 
E)  15g.

Question 4

What is the mass of 1 mole of helium gas?

Accepted Answer

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

Question 5

For the question(s) that follow, consider the following equation.
2Mg + O₂ → 2MgO
-How many grams of MgO are produced when 40.0 grams of O₂ react completely with Mg?

Accepted Answer

A)  30.4 g 
B)  50.4 g 
C)  60.8 g 
D)  101 g 
E)  201 g 
A)  30.4 g 
B)  50.4 g 
C)  60.8 g 
D)  101 g 
E)  201 g

Question 6

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 7

How many kcal are produced when 32.0 g of CH4 react? 
CH4 + 2O₂ → CO₂ + 2H₂O + 218 kcal

Accepted Answer

A)  218 kcal 
B)  109 kcal 
C)  436 kcal 
D)  6.81 kcal 
E)  698 kcal 
A)  218 kcal 
B)  109 kcal 
C)  436 kcal 
D)  6.81 kcal 
E)  698 kcal

Question 8

The __________ is the energy difference between reactants and products in a chemical reaction.

Accepted Answer

A)  transition energy 
B)  activation energy 
C)  product energy 
D)  overall energy 
E)  heat of reaction 
A)  transition energy 
B)  activation energy 
C)  product energy 
D)  overall energy 
E)  heat of reaction

Question 9

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 10

The % yield is the ratio of the theoretical yield to the actual yield multiplied by 100.

Accepted Answer

A) True 
 B)False

Question 11

In this reaction, what is the correct coefficient for hydrogen gas? 
? H₂ + ? O₂ → ? H₂O

Accepted Answer

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

Question 12

Given the following equation, what is the correct form of the conversion factor needed to convert the number of moles of O? to the number of moles of Fe2O? produced?
 4Fe(s) + 3O? (g) ? 2Fe2O?(s)

Accepted Answer

A)  $\frac { 4 \text { moles of } \mathrm { F } _ { \mathrm { e } } } { 3 \text { moles of } \mathrm { O } _ { 2 } }$ 
B)  $\frac { 4 \text { moles of } \mathrm { F } _ { \mathrm { e } } } { 3 \text { moles of } \mathrm { Fe } _ { 2 } \mathrm { O } _ { 3 } }$ 
C)  $\frac { 3 \text { moles of } \mathrm { O } _ { 2 } } { 3 \text { moles of } \mathrm { Fe } _ { 2 } \mathrm { O } _ { 3 } }$ 
D)  $\frac { 2 \text { moles of } \mathrm { Fe } _ { \mathrm { 2 } } \mathrm { O } _ { 3 } } { 4 \text { moles of Fe} }$ 
E)  $\frac { 2 \text { moles of } \mathrm { Fe } _ { 2 } \mathrm { O } _ { 3 } } { 3 \text { moles of } \mathrm { O } _ { 2 } }$ 
A)  $\frac { 4 \text { moles of } \mathrm { F } _ { \mathrm { e } } } { 3 \text { moles of } \mathrm { O } _ { 2 } }$ 
B)  $\frac { 4 \text { moles of } \mathrm { F } _ { \mathrm { e } } } { 3 \text { moles of } \mathrm { Fe } _ { 2 } \mathrm { O } _ { 3 } }$ 
C)  $\frac { 3 \text { moles of } \mathrm { O } _ { 2 } } { 3 \text { moles of } \mathrm { Fe } _ { 2 } \mathrm { O } _ { 3 } }$ 
D)  $\frac { 2 \text { moles of } \mathrm { Fe } _ { \mathrm { 2 } } \mathrm { O } _ { 3 } } { 4 \text { moles of Fe} }$ 
E)  $\frac { 2 \text { moles of } \mathrm { Fe } _ { 2 } \mathrm { O } _ { 3 } } { 3 \text { moles of } \mathrm { O } _ { 2 } }$

Question 13

What type of reaction is the following?
Zn + 2HCl → ZnCl₂ + H₂

Accepted Answer

single rep

Question 14

Which of the following describes an oxidation reaction?

Accepted Answer

A)  loss of electrons or loss of oxygen 
B)  loss of electrons or gain of oxygen 
C)  loss of electrons or gain of hydrogen 
D)  gain of electrons or gain of oxygen 
E)  gain of electrons or loss of H 
A)  loss of electrons or loss of oxygen 
B)  loss of electrons or gain of oxygen 
C)  loss of electrons or gain of hydrogen 
D)  gain of electrons or gain of oxygen 
E)  gain of electrons or loss of H

Question 15

Identify the energy associated with each of the labeled parts of the following diagram.

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

Accepted Answer

The answer of Identify the energy associated with each of...

Question 16

How many moles of iron are present in 3.15 × 1024 atoms of iron?

Accepted Answer

A)  5.23 moles 
B)  1.90 moles 
C)  292 moles 
D)  0.523 moles 
E)  1.90 × 1048 moles 
A)  5.23 moles 
B)  1.90 moles 
C)  292 moles 
D)  0.523 moles 
E)  1.90 × 1048 moles

Question 17

In this reaction, what is the coefficient for calcium oxide? 
CaO(s) + CO₂(g) → CaCO₃(s)

Accepted Answer

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

Question 18

What type of reaction is the following?
2KClO3O3 → 2KCl + 3O₂

Accepted Answer

decomposit

Question 19

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 20

One mole of helium gas weighs

Accepted Answer

A)  1.00 g. 
B)  2.00 g. 
C)  3.00 g. 
D)  4.00 g. 
E)  8.00 g. 
A)  1.00 g. 
B)  2.00 g. 
C)  3.00 g. 
D)  4.00 g. 
E)  8.00 g.

Exam 6: Chemical Reactions and Quantities

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

Identify the energy associated with each of the labeled parts of the following diagram. -Region A A) heat of reaction B) activation energy C) energy of reactants D) energy of products

The molar mass of potassium is

What is the mass of 1 mole of helium gas?

For the question(s) that follow, consider the following equation. 2Mg + O₂ → 2MgO -How many grams of MgO are produced when 40.0 grams of O₂ react completely with Mg?

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

How many kcal are produced when 32.0 g of CH4 react? CH4 + 2O₂ → CO₂ + 2H₂O + 218 kcal

The __________ is the energy difference between reactants and products in a chemical reaction.

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

The % yield is the ratio of the theoretical yield to the actual yield multiplied by 100.

In this reaction, what is the correct coefficient for hydrogen gas? ? H₂ + ? O₂ → ? H₂O

Given the following equation, what is the correct form of the conversion factor needed to convert the number of moles of O? to the number of moles of Fe2O? produced? 4Fe(s) + 3O? (g) ? 2Fe2O?(s)

What type of reaction is the following? Zn + 2HCl → ZnCl₂ + H₂

Which of the following describes an oxidation reaction?

Identify the energy associated with each of the labeled parts of the following diagram. -Region B A) heat of reaction B) activation energy C) energy of reactants D) energy of products

How many moles of iron are present in 3.15 × 1024 atoms of iron?

In this reaction, what is the coefficient for calcium oxide? CaO(s) + CO₂(g) → CaCO₃(s)

What type of reaction is the following? 2KClO3O3 → 2KCl + 3O₂

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

One mole of helium gas weighs

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How many kcal are produced when 32.0 g of CH₄ react? CH₄ + 2O₂ → CO₂ + 2H₂O + 218 kcal

Given the following equation, what is the correct form of the conversion factor needed to convert the number of moles of O? to the number of moles of Fe₂O? produced? 4Fe(s) + 3O? (g) ? 2Fe₂O?(s)

How many moles of iron are present in 3.15 × 10²⁴ atoms of iron?

What type of reaction is the following? 2KClO₃O₃ → 2KCl + 3O₂