Question 1

Avogadro's number is the number of

Accepted Answer

A)  particles in 1 mole of a substance. 
B)  amu in 1 mole of a substance. 
C)  grams in 1 mole of a substance. 
D)  moles in 6.02 × 1023 grams of an element. 
E)  moles in 6.02 × 1023 amu of an element. 
A)  particles in 1 mole of a substance. 
B)  amu in 1 mole of a substance. 
C)  grams in 1 mole of a substance. 
D)  moles in 6.02 × 1023 grams of an element. 
E)  moles in 6.02 × 1023 amu of an element. A

Question 2

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 D

Question 3

The molar mass of magnesium is 24.3 g.

Accepted Answer

A) True 
 B)False  True

Question 4

Identify the letter of the diagram corresponding to the given type of reaction. A.  B.  
-Region D

Accepted Answer

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

Question 5

For the question(s) that follow, consider the following equation.
2Mg + O₂ → 2MgO
-The number of moles of MgO produced when 0.20 mole of O₂ reacts completely is

Accepted Answer

A)  0.10 mole. 
B)  0.20 mole. 
C)  0.40 mole. 
D)  0.60 mole. 
E)  0.80 mole. 
A)  0.10 mole. 
B)  0.20 mole. 
C)  0.40 mole. 
D)  0.60 mole. 
E)  0.80 mole.

Question 6

In the reaction of hydrogen gas with oxygen gas to produce water, 16.0 g of oxygen gas can produce 9.00 g of water, given sufficient hydrogen available.
2H₂ + O₂ → 2 H₂O

Accepted Answer

A) True 
 B)False

Question 7

What is the mass of 1 mole of argon gas?

Accepted Answer

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

Question 8

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 9

Answer the question(s) that follow about the following reaction.
2H₂O₂ → 2H₂O + O₂
-How many grams of hydrogen peroxide ( H₂O₂ ) are needed to produce 25.0 g of oxygen?

Accepted Answer

A)  106 g 
B)  26.6 g 
C)  5.88 g 
D)  25.0 g 
E)  53.1 g 
A)  106 g 
B)  26.6 g 
C)  5.88 g 
D)  25.0 g 
E)  53.1 g

Question 10

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 11

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 sulfate can be produced from 20.8 g of barium chloride?

Accepted Answer

A)  1.37 g 
B)  2.33 g 
C)  23.3 g 
D)  137 g 
E)  233 g 
A)  1.37 g 
B)  2.33 g 
C)  23.3 g 
D)  137 g 
E)  233 g

Question 12

For the question(s) that follow, consider the following balanced equation.
Mg₃N₂(s) + 6H₂O(l) → 3Mg(OH)₂(s) + 2NHS1U1B13S1U1B0(g)
-How many grams of NO are required to produce 145 g of N₂ in the following reaction? 
4NH3(g) + 6NO(g) → 5N₂ (g) + 6H₂O(l)

Accepted Answer

A)  186 g 
B)  155 g 
C)  125 g 
D)  129 g 
E)  145 g 
A)  186 g 
B)  155 g 
C)  125 g 
D)  129 g 
E)  145 g

Question 13

For the question(s) that follow, consider the following balanced equation.
Mg₃N₂(s) + 6H₂O(l) → 3Mg(OH)₂(s) + 2NHS1U1B13S1U1B0(g)
-Find the mass of AlCl3 that is produced when 10.0 grams of Al2O₃ react with 10.0 g of HCl according to the following equation. 
Al2O₃(s) + 6HCl(aq) → 2AlCl3(aq) + 3H₂O(aq)

Accepted Answer

A)  16.2 g 
B)  20.0 g 
C)  12.2 g 
D)  10.0 g 
E)  6.10 g 
A)  16.2 g 
B)  20.0 g 
C)  12.2 g 
D)  10.0 g 
E)  6.10 g

Question 14

One mole of neon atoms has a mass of

Accepted Answer

A)  6.02 × 1023 grams. 
B)  14.0 g. 
C)  10.0 g. 
D)  20.2 g. 
E)  30.2 g. 
A)  6.02 × 1023 grams. 
B)  14.0 g. 
C)  10.0 g. 
D)  20.2 g. 
E)  30.2 g.

Question 15

Calculate the molar mass of potassium chloride, KCl.

Accepted Answer

A)  74.6 g 
B)  54.5 g 
C)  6.74 g 
D)  67.4 g 
E)  19.0 g 
A)  74.6 g 
B)  54.5 g 
C)  6.74 g 
D)  67.4 g 
E)  19.0 g

Question 16

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 17

What is the molar mass of Mg₃(PO₄)₂, a substance formerly used in medicine as an antacid?

Accepted Answer

A)  71.3 g 
B)  118.3 g 
C)  150.3 g 
D)  214.3 g 
E)  262.9 g 
A)  71.3 g 
B)  118.3 g 
C)  150.3 g 
D)  214.3 g 
E)  262.9 g

Question 18

Answer the question(s) that follow about the following reaction.
2H₂O₂ → 2H₂O + O₂
-How many moles of oxygen gas can 30. g of hydrogen peroxide ( H₂O₂) produce, if decomposition is complete?

Accepted Answer

A)  0.50 mole 
B)  0.88 mole 
C)  1.0 mole 
D)  2.0 mole 
E)  0.44 mole 
A)  0.50 mole 
B)  0.88 mole 
C)  1.0 mole 
D)  2.0 mole 
E)  0.44 mole

Question 19

In an endothermic reaction,

Accepted Answer

A)  heat flows out of the system. 
B)  energy is absorbed by the system. 
C)  the temperature of the system increases. 
D)  the products have less energy that the reactants. 
E)  the products have the same energy that the reactants. 
A)  heat flows out of the system. 
B)  energy is absorbed by the system. 
C)  the temperature of the system increases. 
D)  the products have less energy that the reactants. 
E)  the products have the same energy that the reactants.

Question 20

How many grams of Fe2O₃ are there in 0.500 mole of Fe2O₃?

Accepted Answer

A)  79.8 g 
B)  35.9 g 
C)  63.8 g 
D)  51.9 g 
E)  160. g 
A)  79.8 g 
B)  35.9 g 
C)  63.8 g 
D)  51.9 g 
E)  160. g

Exam 6: Chemical Reactions and Quantities

Avogadro's number is the number of

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

The molar mass of magnesium is 24.3 g.

Identify the letter of the diagram corresponding to the given type of reaction. A. B. -Region D

For the question(s) that follow, consider the following equation. 2Mg + O₂ → 2MgO -The number of moles of MgO produced when 0.20 mole of O₂ reacts completely is

In the reaction of hydrogen gas with oxygen gas to produce water, 16.0 g of oxygen gas can produce 9.00 g of water, given sufficient hydrogen available. 2H₂ + O₂ → 2 H₂O

What is the mass of 1 mole of argon gas?

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)

Answer the question(s) that follow about the following reaction. 2H₂O₂ → 2H₂O + O₂ -How many grams of hydrogen peroxide ( H₂O₂ ) are needed to produce 25.0 g of oxygen?

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

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 sulfate can be produced from 20.8 g of barium chloride?

For the question(s) that follow, consider the following balanced equation. Mg₃N₂(s) + 6H₂O(l) → 3Mg(OH)₂(s) + 2NH3(g) -How many grams of NO are required to produce 145 g of N₂ in the following reaction? 4NH3(g) + 6NO(g) → 5N₂ (g) + 6H₂O(l)

One mole of neon atoms has a mass of

Calculate the molar mass of potassium chloride, KCl.

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

What is the molar mass of Mg₃(PO₄)₂, a substance formerly used in medicine as an antacid?

Answer the question(s) that follow about the following reaction. 2H₂O₂ → 2H₂O + O₂ -How many moles of oxygen gas can 30. g of hydrogen peroxide ( H₂O₂) produce, if decomposition is complete?

In an endothermic reaction,

How many grams of Fe2O₃ are there in 0.500 mole of Fe2O₃?

Chemistry and Measurements

Energy and Matter

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Nuclear Chemistry

Compounds and Their Bonds

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Reaction Rates and Chemical Equilibrium

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Introduction to Organic Chemistry: Alkanes

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Aldehydes, Ketones, and Chiral Molecules

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Filters

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)

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 sulfate can be produced from 20.8 g of barium chloride?

For the question(s) that follow, consider the following balanced equation. Mg₃N₂(s) + 6H₂O(l) → 3Mg(OH)₂(s) + 2NH₃(g) -How many grams of NO are required to produce 145 g of N₂ in the following reaction? 4NH₃(g) + 6NO(g) → 5N₂ (g) + 6H₂O(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

How many grams of Fe₂O₃ are there in 0.500 mole of Fe₂O₃?