Question 1

What chemical process is happening at the anode of a fuel cell, which uses the following reaction to generate electricity? 2H₂ + O₂ → 2H₂O

Accepted Answer

A)  Hydrogen is being oxidized. 
B)  Oxygen is being oxidized. 
C)  Nothing at all is happening there. 
D)  Oxygen is being reduced. 
A)  Hydrogen is being oxidized. 
B)  Oxygen is being oxidized. 
C)  Nothing at all is happening there. 
D)  Oxygen is being reduced.

Question 2

The cathode is called the positive electrode.

Accepted Answer

A) True 
 B)False

Question 3

Match each element with its most likely oxidation state.
-nitrogen

Accepted Answer

A) +2 
B) -1 
C) -3, +3, 5 
D) -2 
E) +4,-4
F)+3
G)+1
H)-3 
A) +2 
B) -1 
C) -3, +3, 5 
D) -2 
E) +4,-4
F)+3
G)+1
H)-3

Question 4

Match each compound with its corresponding carbon oxidation.
-CH?

Accepted Answer

A) +4 
B) -4 
C) 0 
D) +2 
E) -1 
A) +4 
B) -4 
C) 0 
D) +2 
E) -1

Question 5

Assign the oxidation state of:
a) each rhenium, in Re2O7
b) zirconium, in ZrCl4
c) sulfur in Na₂S2O₃
d) iodine in KIO₃

Accepted Answer

a) +7 (eac

Question 6

Match each cation with its corresponding number of electrons.
-lithium ion

Accepted Answer

A) 54 
B) 2 
C) 10 
D) 18 
A) 54 
B) 2 
C) 10 
D) 18

Question 7

Identify the element that was reduced. H₂SO₄ + Al(OH)3 → AL₂(SO₄)3 + H₂O

Accepted Answer

A)  aluminum 
B)  sulfur 
C)  oxygen 
D)  No elements were either oxidized or reduced. 
A)  aluminum 
B)  sulfur 
C)  oxygen 
D)  No elements were either oxidized or reduced.

Question 8

Match each element with its most likely oxidation state.
-aluminum

Accepted Answer

A) +2 
B) -1 
C) -3, +3, 5 
D) -2 
E) +4,-4
F)+3
G)+1
H)-3 
A) +2 
B) -1 
C) -3, +3, 5 
D) -2 
E) +4,-4
F)+3
G)+1
H)-3

Question 9

Match each compound with its corresponding nitrogen oxidation state.
-dinitrogen pentoxide

Accepted Answer

A) +3 
B) +5 
C) 0 
D) +4 
E) +2
F)-3 
A) +3 
B) +5 
C) 0 
D) +4 
E) +2
F)-3

Question 10

Match each compound with its corresponding nitrogen oxidation state.
-nitrogen gas

Accepted Answer

A) +3 
B) +5 
C) 0 
D) +4 
E) +2
F)-3 
A) +3 
B) +5 
C) 0 
D) +4 
E) +2
F)-3

Question 11

In the water molecule, which atom holds the shared electrons between hydrogen and oxygen?

Accepted Answer

A)  oxygen 
B)  hydrogen 
C)  both are shared equally 
D)  One cannot say unless the state of water is known. 
A)  oxygen 
B)  hydrogen 
C)  both are shared equally 
D)  One cannot say unless the state of water is known.

Question 12

For each reaction above that can be classified as an electron transfer reaction, state which element(s) gain, and which element(s) lose, electrons.
(a) Ba(OH)2 + H₂SO₄ → 2H₂O + BaSO₄
(b) NaOH + HCl → NaCl + H₂O
(c) 2H₂ + O₂ → 2H₂O
(d) C₂H₆O + 3O₂ → 2CO₂ + 3H₂O

Accepted Answer

Reactions (a) and (b) cannot b

Question 13

Which atom(s) has a more negative oxidation state on the product side than the reactant side? Fe2O₃ + 3CO → 2Fe + 3CO₂

Accepted Answer

A)  iron 
B)  oxygen 
C)  carbon 
D)  carbon and oxygen 
A)  iron 
B)  oxygen 
C)  carbon 
D)  carbon and oxygen

Question 14

Match each element with its most likely oxidation state.
-carbon

Accepted Answer

A) +2 
B) -1 
C) -3, +3, 5 
D) -2 
E) +4,-4
F)+3
G)+1
H)-3 
A) +2 
B) -1 
C) -3, +3, 5 
D) -2 
E) +4,-4
F)+3
G)+1
H)-3

Question 15

What is the sum of the oxidation states in the following species H₂SbO₃-?

Accepted Answer

A)  0 
B)  -1 
C)  +2 
D)  -2 
A)  0 
B)  -1 
C)  +2 
D)  -2

Question 16

The reactants in a dry cell are ________.

Accepted Answer

A)  Cu+2 and Zn 
B)  Zn+2 and Cu 
C)  Zn and MnO₂ 
D)  Zn+2 and Al 
A)  Cu+2 and Zn 
B)  Zn+2 and Cu 
C)  Zn and MnO₂ 
D)  Zn+2 and Al

Question 17

Match each compound with its corresponding carbon oxidation.
-C?0

Accepted Answer

A) +4 
B) -4 
C) 0 
D) +2 
E) -1 
A) +4 
B) -4 
C) 0 
D) +2 
E) -1

Question 18

The oxygen anion almost always has the charge of -2.

Accepted Answer

A) True 
 B)False

Question 19

Match each cation with its corresponding number of electrons.
-cesium ion

Accepted Answer

A) 54 
B) 2 
C) 10 
D) 18 
A) 54 
B) 2 
C) 10 
D) 18

Question 20

The sum of the oxidation states of all atoms in a formula must add up to the overall charge of the formula.

Accepted Answer

A) True 
 B)False

What chemical process is happening at the anode of a fuel cell, which uses the following reaction to generate electricity? 2H₂ + O₂ → 2H₂O

The cathode is called the positive electrode.

Match each element with its most likely oxidation state. -nitrogen

Match each compound with its corresponding carbon oxidation. -CH?

Assign the oxidation state of: a) each rhenium, in Re₂O₇ b) zirconium, in ZrCl₄ c) sulfur in Na₂S₂O₃ d) iodine in KIO₃

Match each cation with its corresponding number of electrons. -lithium ion

Identify the element that was reduced. H₂SO₄ + Al(OH)3 → AL₂(SO₄)3 + H₂O

Match each element with its most likely oxidation state. -aluminum

Match each compound with its corresponding nitrogen oxidation state. -dinitrogen pentoxide

Match each compound with its corresponding nitrogen oxidation state. -nitrogen gas

In the water molecule, which atom holds the shared electrons between hydrogen and oxygen?

For each reaction above that can be classified as an electron transfer reaction, state which element(s) gain, and which element(s) lose, electrons. (a) Ba(OH)2 + H₂SO₄ → 2H₂O + BaSO₄ (b) NaOH + HCl → NaCl + H₂O (c) 2H₂ + O₂ → 2H₂O (d) C₂H₆O + 3O₂ → 2CO₂ + 3H₂O

Which atom(s) has a more negative oxidation state on the product side than the reactant side? Fe₂O₃ + 3CO → 2Fe + 3CO₂

Match each element with its most likely oxidation state. -carbon

What is the sum of the oxidation states in the following species H₂SbO₃-?

The reactants in a dry cell are ________.

Match each compound with its corresponding carbon oxidation. -C?0

The oxygen anion almost always has the charge of -2.

Match each cation with its corresponding number of electrons. -cesium ion

The sum of the oxidation states of all atoms in a formula must add up to the overall charge of the formula.

What Is Chemistry

The Numerical Side of Chemistry

The Evolution of Atomic Theory

The Modern Model of the Atom

Chemical Bonding and Nomenclature

The Shape of Molecules

Intermolecular Forces and the Phases of Matter

Chemical Reactions

Stoichiometry and the Mole

What If There Were No Intermolecular Forces - the Ideal Gas

Solutions

When Reactants Turn Into Products

Chemical Equilibrium

Electrolytes, Acids, and Bases

Nuclear Chemistry

The Chemistry of Carbon

Synthetic and Biological Polymers

Filters

Exam 10: Electron Transfer in Chemical Reactions

What chemical process is happening at the anode of a fuel cell, which uses the following reaction to generate electricity? 2H₂ + O₂ → 2H₂O

The cathode is called the positive electrode.

Match each element with its most likely oxidation state. -nitrogen

Match each compound with its corresponding carbon oxidation. -CH?

Assign the oxidation state of: a) each rhenium, in Re2O7 b) zirconium, in ZrCl4 c) sulfur in Na₂S2O₃ d) iodine in KIO₃

Match each cation with its corresponding number of electrons. -lithium ion

Identify the element that was reduced. H₂SO₄ + Al(OH)3 → AL₂(SO₄)3 + H₂O

Match each element with its most likely oxidation state. -aluminum

Match each compound with its corresponding nitrogen oxidation state. -dinitrogen pentoxide

Match each compound with its corresponding nitrogen oxidation state. -nitrogen gas

In the water molecule, which atom holds the shared electrons between hydrogen and oxygen?

For each reaction above that can be classified as an electron transfer reaction, state which element(s) gain, and which element(s) lose, electrons. (a) Ba(OH)2 + H₂SO₄ → 2H₂O + BaSO₄ (b) NaOH + HCl → NaCl + H₂O (c) 2H₂ + O₂ → 2H₂O (d) C₂H₆O + 3O₂ → 2CO₂ + 3H₂O

Which atom(s) has a more negative oxidation state on the product side than the reactant side? Fe2O₃ + 3CO → 2Fe + 3CO₂

Match each element with its most likely oxidation state. -carbon

What is the sum of the oxidation states in the following species H₂SbO₃-?

The reactants in a dry cell are ________.

Match each compound with its corresponding carbon oxidation. -C?0

The oxygen anion almost always has the charge of -2.

Match each cation with its corresponding number of electrons. -cesium ion

The sum of the oxidation states of all atoms in a formula must add up to the overall charge of the formula.

What Is Chemistry

The Numerical Side of Chemistry

The Evolution of Atomic Theory

The Modern Model of the Atom

Chemical Bonding and Nomenclature

The Shape of Molecules

Intermolecular Forces and the Phases of Matter

Chemical Reactions

Stoichiometry and the Mole

What If There Were No Intermolecular Forces - the Ideal Gas

Solutions

When Reactants Turn Into Products

Chemical Equilibrium

Electrolytes, Acids, and Bases

Nuclear Chemistry

The Chemistry of Carbon

Synthetic and Biological Polymers

Filters

Assign the oxidation state of: a) each rhenium, in Re₂O₇ b) zirconium, in ZrCl₄ c) sulfur in Na₂S₂O₃ d) iodine in KIO₃

Which atom(s) has a more negative oxidation state on the product side than the reactant side? Fe₂O₃ + 3CO → 2Fe + 3CO₂