Question 1

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 2

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.

Question 3

0.100 mole of lithium has a mass of

Accepted Answer

A) 3.00 g. 
B) 0.300 g. 
C) 6.94 g. 
D) 0.694 g. 
E) 0.700 g. 
A) 3.00 g. 
B) 0.300 g. 
C) 6.94 g. 
D) 0.694 g. 
E) 0.700 g.

Question 4

How many hydrogen atoms are present in 75.0 g of H2O?

Accepted Answer

A) 75.0 atoms 
B) 4.17 atoms 
C) 7.53 × 1024 atoms 
D) 2.51 × 1024 atoms 
E) 5.02 × 1024 atoms 
A) 75.0 atoms 
B) 4.17 atoms 
C) 7.53 × 1024 atoms 
D) 2.51 × 1024 atoms 
E) 5.02 × 1024 atoms

Question 5

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 6

How many moles of carbon atoms are there in 0.500 mole of C2H6?

Accepted Answer

A) 0.500 moles 
B) 1.00 moles 
C) 3.00 moles 
D) 6.02 × 1023 moles 
E) 4.00 moles 
A) 0.500 moles 
B) 1.00 moles 
C) 3.00 moles 
D) 6.02 × 1023 moles 
E) 4.00 moles

Question 7

Answer the question(s) that follow about the following reaction.
2HS1U1B12S1U1B0OS1U1B12S1U1B0 → 2HS1U1B12S1U1B0O + OS1U1B12S1U1B0
-How many moles of oxygen gas can 0.88 mole of hydrogen peroxide (H2O2) produce, if decomposition is complete?

Accepted Answer

A) 0.50 mole 
B) 0.88 mole 
C) 1.8 moles 
D) 2.0 moles 
E) 0.44 mole 
A) 0.50 mole 
B) 0.88 mole 
C) 1.8 moles 
D) 2.0 moles 
E) 0.44 mole

Question 8

One mole of particles of any substance contains how many particles?

Accepted Answer

A) 106 
B) 3 × 10-10 
C) 3 × 1010 
D) 6.02 × 1023 
E) 6.02 × 10-23 
A) 106 
B) 3 × 10-10 
C) 3 × 1010 
D) 6.02 × 1023 
E) 6.02 × 10-23

Question 9

Which of the following gives the balanced equation for this reaction? 
K3PO₄ + Ca(NO₃)₂ → Ca3(PO₄)₂ + KNO₃

Accepted Answer

A) KPO₄+ CaNO₃+ KNO₃ 
B) K3PO₄+ Ca(NO₃)₂→ Ca3(PO₄)₂+ 3KNO₃ 
C) 2K3PO₄+ Ca(NO₃)₂→ Ca3(PO₄)₂+ 6KNO₃ 
D) 2K3PO₄+ 3Ca(NO₃)₂→ Ca3(PO₄)₂+ 6KNO₃ 
E) K3PO₄+ Ca(NO₃)₂→ Ca3(PO₄)₂+ KNO₃ 
A) KPO₄+ CaNO₃+ KNO₃ 
B) K3PO₄+ Ca(NO₃)₂→ Ca3(PO₄)₂+ 3KNO₃ 
C) 2K3PO₄+ Ca(NO₃)₂→ Ca3(PO₄)₂+ 6KNO₃ 
D) 2K3PO₄+ 3Ca(NO₃)₂→ Ca3(PO₄)₂+ 6KNO₃ 
E) K3PO₄+ Ca(NO₃)₂→ Ca3(PO₄)₂+ KNO₃

Question 10

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

Accepted Answer

decomposit

Question 11

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 12

The molar mass of copper(II) chloride is 134.5 g.

Accepted Answer

A) True 
 B)False

Question 13

For the question(s) that follow, consider the following equation.
2Mg + OS1U1B12S1U1B0 → 2MgO
-How many moles of magnesium are needed to react with 0.50 mole of O2?

Accepted Answer

A) 0.50 mole 
B) 1.0 moles 
C) 2.0 moles 
D) 3.0 moles 
E) 4.0 moles 
A) 0.50 mole 
B) 1.0 moles 
C) 2.0 moles 
D) 3.0 moles 
E) 4.0 moles

Question 14

For the question(s) that follow, consider the following equation.
2Mg + OS1U1B12S1U1B0 → 2MgO
-The number of moles of oxygen gas needed to react with 4.0 moles of Mg is

Accepted Answer

A) 1.0 mole. 
B) 2.0 moles. 
C) 3.0 moles. 
D) 4.0 moles. 
E) 6.0 moles. 
A) 1.0 mole. 
B) 2.0 moles. 
C) 3.0 moles. 
D) 4.0 moles. 
E) 6.0 moles.

Question 15

4.00 moles of sodium have a mass of

Accepted Answer

A) 4.60 g. 
B) 11.0 g. 
C) 23.0 g. 
D) 44.0 g. 
E) 92.0 g. 
A) 4.60 g. 
B) 11.0 g. 
C) 23.0 g. 
D) 44.0 g. 
E) 92.0 g.

Question 16

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 17

Calculate the molar mass of magnesium chloride, MgCl₂ .

Accepted Answer

A) 24.3 g 
B) 95.2 g 
C) 125.9 g 
D) 59.8 g 
E) 70.0 g 
A) 24.3 g 
B) 95.2 g 
C) 125.9 g 
D) 59.8 g 
E) 70.0 g

Question 18

The molar mass of silver is 47 g.

Accepted Answer

A) True 
 B)False

Question 19

If the reaction shown below is exothermic, the energy level of the reactants is H2 + O2 → 2H2O

Accepted Answer

A) lower than that of the products. 
B) higher than that of the products. 
C) the same as that of the products. 
D) possibly lower, possibly higher than that of the products. 
E) higher than the activation energy of the reaction. 
A) lower than that of the products. 
B) higher than that of the products. 
C) the same as that of the products. 
D) possibly lower, possibly higher than that of the products. 
E) higher than the activation energy of the reaction.

Question 20

What is the coefficient of hydrogen, H2, when the following equation is balanced? 
Al + H2SO₄ → Al2(SO₄)3 + ? H2

Accepted Answer

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

Exam 7: Chemical Reactions and Quantities

Which of the following describes an oxidation reaction?

Avogadro's number is the number of

0.100 mole of lithium has a mass of

How many hydrogen atoms are present in 75.0 g of H2O?

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)

How many moles of carbon atoms are there in 0.500 mole of C2H6?

Answer the question(s) that follow about the following reaction. 2H2O2 → 2H2O + O2 -How many moles of oxygen gas can 0.88 mole of hydrogen peroxide (H2O2) produce, if decomposition is complete?

One mole of particles of any substance contains how many particles?

Which of the following gives the balanced equation for this reaction? K3PO₄ + Ca(NO₃)₂ → Ca3(PO₄)₂ + KNO₃

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

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)

The molar mass of copper(II) chloride is 134.5 g.

For the question(s) that follow, consider the following equation. 2Mg + O2 → 2MgO -How many moles of magnesium are needed to react with 0.50 mole of O2?

For the question(s) that follow, consider the following equation. 2Mg + O2 → 2MgO -The number of moles of oxygen gas needed to react with 4.0 moles of Mg is

4.00 moles of sodium have a mass of

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

Calculate the molar mass of magnesium chloride, MgCl₂ .

The molar mass of silver is 47 g.

If the reaction shown below is exothermic, the energy level of the reactants is H2 + O2 → 2H2O

What is the coefficient of hydrogen, H2, when the following equation is balanced? Al + H2SO₄ → Al2(SO₄)3 + ? H2

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How many hydrogen atoms are present in 75.0 g of H₂O?

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)

How many moles of carbon atoms are there in 0.500 mole of C₂H₆?

Answer the question(s) that follow about the following reaction. 2H₂O₂ → 2H₂O + O₂ -How many moles of oxygen gas can 0.88 mole of hydrogen peroxide (H₂O₂) produce, if decomposition is complete?

Which of the following gives the balanced equation for this reaction? K₃PO₄ + Ca(NO₃)₂ → Ca₃(PO₄)₂ + KNO₃

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

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)

For the question(s) that follow, consider the following equation. 2Mg + O₂ → 2MgO -How many moles of magnesium are needed to react with 0.50 mole of O₂?

For the question(s) that follow, consider the following equation. 2Mg + O₂ → 2MgO -The number of moles of oxygen gas needed to react with 4.0 moles of Mg is

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

If the reaction shown below is exothermic, the energy level of the reactants is H₂ + O₂ → 2H₂O

What is the coefficient of hydrogen, H₂, when the following equation is balanced? Al + H₂SO₄ → Al₂(SO₄)₃ + ? H₂