Question 1

Which of the following is true for the following reaction? Zn + CuCL₂ → ZnCL₂ + Cu

Accepted Answer

A)  The solution will turn blue. 
B)  The solution will turn from blue to light blue. 
C)  The gray zinc powder will disappear. 
D)  Both B and C are correct. 
A)  The solution will turn blue. 
B)  The solution will turn from blue to light blue. 
C)  The gray zinc powder will disappear. 
D)  Both B and C are correct.

Question 2

Match each compound with its corresponding carbon oxidation.
-Na?CO?

Accepted Answer

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

Question 3

The oxidation state of chlorine in the perchlorate ion is ________.

Accepted Answer

A)  +8 
B)  +7 
C)  -1 
D)  +6 
A)  +8 
B)  +7 
C)  -1 
D)  +6

Question 4

Assign oxidation states to each of the atoms in the following chemical species:
a) H₂S
b) Cu2S
c) HBrO₂
d) KHCO₃

Accepted Answer

a) H +1, S -2
b) Cu

Question 5

Identify the reduced species in the following chemical process. Cu + 2AgCl → CuCl2 + 2Ag

Accepted Answer

A)  Ag 
B)  Ag+ 
C)  Cl- 
D)  Cu 
A)  Ag 
B)  Ag+ 
C)  Cl- 
D)  Cu

Question 6

Identify the compound that contains bromine with a +3 oxidation state.

Accepted Answer

A)  NaBrO₂ 
B)  NaBrO₃ 
C)  NaBrO 
D)  NaBrO₄ 
A)  NaBrO₂ 
B)  NaBrO₃ 
C)  NaBrO 
D)  NaBrO₄

Question 7

The only element that is more electronegative than oxygen is ________.

Accepted Answer

A)  chlorine 
B)  fluorine 
C)  nitrogen 
D)  sulfur 
A)  chlorine 
B)  fluorine 
C)  nitrogen 
D)  sulfur

Question 8

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

Accepted Answer

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

Question 9

Which of the following is true for the following reaction? Mg + O₂ → 2 MgO

Accepted Answer

A)  Magnesium is oxidized. 
B)  The oxidation state of magnesium in MgO is +2. 
C)  Oxygen is reduced. 
D)  All of the above are true. 
A)  Magnesium is oxidized. 
B)  The oxidation state of magnesium in MgO is +2. 
C)  Oxygen is reduced. 
D)  All of the above are true.

Question 10

The reducing agent is ________.

Accepted Answer

A)  reduced in a redox equation 
B)  oxidized in a redox equation 
C)  reduced in an oxidation reaction 
D)  oxidized in a reduction reaction 
A)  reduced in a redox equation 
B)  oxidized in a redox equation 
C)  reduced in an oxidation reaction 
D)  oxidized in a reduction reaction

Question 11

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

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 12

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

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 13

Match each compound with its corresponding nitrogen oxidation state.
-sodium nitrite

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 14

Which atom in the compound K₂C₂O₄ has a positive oxidation state?

Accepted Answer

A)  potassium 
B)  carbon 
C)  both potassium and carbon 
D)  both potassium and oxygen 
A)  potassium 
B)  carbon 
C)  both potassium and carbon 
D)  both potassium and oxygen

Question 15

The oxidation state of chlorine in sodium perchlorate is ________.

Accepted Answer

A)  -1 
B)  +1 
C)  +3 
D)  +7 
A)  -1 
B)  +1 
C)  +3 
D)  +7

Question 16

Which of the following reactions is not an oxidation-reduction reaction?

Accepted Answer

A)  2 Na + H₂O → 2 NaOH + H₂ 
B)  Mg + 2 HCl → MgCL₂ + H₂ 
C)  CH₄ + 2 O₂ → CO₂ + 2 H₂O 
D)  CaO + CO₂ → CaCO₃ 
A)  2 Na + H₂O → 2 NaOH + H₂ 
B)  Mg + 2 HCl → MgCL₂ + H₂ 
C)  CH₄ + 2 O₂ → CO₂ + 2 H₂O 
D)  CaO + CO₂ → CaCO₃

Question 17

The oxidation state of sulfur in the sulfate ion is ________.

Accepted Answer

A)  +6 
B)  +7 
C)  -2 
D)  +4 
A)  +6 
B)  +7 
C)  -2 
D)  +4

Question 18

Which of the following has 8 electrons in the outer shell?

Accepted Answer

A)  Ca₂+ 
B)  Cl+ 
C)  S2+ 
D)  Fe₃+ 
A)  Ca₂+ 
B)  Cl+ 
C)  S2+ 
D)  Fe₃+

Question 19

Which of the following elements may have +4 charge?

Accepted Answer

A)  magnesium 
B)  aluminum 
C)  carbon 
D)  chlorine 
A)  magnesium 
B)  aluminum 
C)  carbon 
D)  chlorine

Question 20

What is the oxidation state of chromium in the compound K₂Cr₂O7?

Accepted Answer

A)  +4 
B)  +6 
C)  +7 
D)  -1 
A)  +4 
B)  +6 
C)  +7 
D)  -1

Which of the following is true for the following reaction? Zn + CuCL₂ → ZnCL₂ + Cu

Match each compound with its corresponding carbon oxidation. -Na?CO?

The oxidation state of chlorine in the perchlorate ion is ________.

Assign oxidation states to each of the atoms in the following chemical species: a) H₂S b) Cu2S c) HBrO₂ d) KHCO₃

Identify the reduced species in the following chemical process. Cu + 2AgCl → CuCl₂ + 2Ag

Identify the compound that contains bromine with a +3 oxidation state.

The only element that is more electronegative than oxygen is ________.

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

Which of the following is true for the following reaction? Mg + O₂ → 2 MgO

The reducing agent is ________.

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

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

Match each compound with its corresponding nitrogen oxidation state. -sodium nitrite

Which atom in the compound K₂C₂O₄ has a positive oxidation state?

The oxidation state of chlorine in sodium perchlorate is ________.

Which of the following reactions is not an oxidation-reduction reaction?

The oxidation state of sulfur in the sulfate ion is ________.

Which of the following has 8 electrons in the outer shell?

Which of the following elements may have +4 charge?

What is the oxidation state of chromium in the compound K₂Cr₂O₇?

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

Which of the following is true for the following reaction? Zn + CuCL₂ → ZnCL₂ + Cu

Match each compound with its corresponding carbon oxidation. -Na?CO?

The oxidation state of chlorine in the perchlorate ion is ________.

Assign oxidation states to each of the atoms in the following chemical species: a) H₂S b) Cu2S c) HBrO₂ d) KHCO₃

Identify the reduced species in the following chemical process. Cu + 2AgCl → CuCl2 + 2Ag

Identify the compound that contains bromine with a +3 oxidation state.

The only element that is more electronegative than oxygen is ________.

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

Which of the following is true for the following reaction? Mg + O₂ → 2 MgO

The reducing agent is ________.

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

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

Match each compound with its corresponding nitrogen oxidation state. -sodium nitrite

Which atom in the compound K₂C₂O₄ has a positive oxidation state?

The oxidation state of chlorine in sodium perchlorate is ________.

Which of the following reactions is not an oxidation-reduction reaction?

The oxidation state of sulfur in the sulfate ion is ________.

Which of the following has 8 electrons in the outer shell?

Which of the following elements may have +4 charge?

What is the oxidation state of chromium in the compound K₂Cr₂O7?

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

Identify the reduced species in the following chemical process. Cu + 2AgCl → CuCl₂ + 2Ag

What is the oxidation state of chromium in the compound K₂Cr₂O₇?