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Study Quiz 3
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1
Which of the following is the balanced half-reaction for the oxidation of copper metal to its 2+ ion?
A)
Cu(s)à Cu2+(aq) + 2e-
B)
Cu(s)à Cu(aq) + 2e-
C)
Cu(s)à Cu(aq)
D)
2Cu(s)à Cu2+(aq)
2
Which of the following half-reactions is balanced?
A)
6NO(aq)à 6NO2(aq)
B)
2NO3-1(aq) + 2 e-à NO2(aq)
C)
2NO3-1(aq)à 3NO2(aq)
D)None of the above
3
Which of the following statements about balancing half-reactions under acidic conditions is true?
A)Oxygen atoms are balanced by adding hydroxide ions to one side of the equation.
B)Oxygen atoms are balanced by removing excess oxygen atoms.
C)Oxygen atoms are balanced by adding water molecules to one side of the equation.
D)Hydrogen atoms are balanced by adding hydronium to one side of the equation.
4
Which of the following statements is true concerning the following equation?
Cr3+(aq) + Cl-(aq)à Cr(s) + Cl2(g)?
A)Chlorine is reduced.
B)Chromium is oxidized.
C)The reaction is not a redox reaction.
D)The equation is not balanced.
5
How would you balance the following equation?

NO2-(aq) + Al(s)à NH3(g) + 2AlO2-(aq)?

A)Add one water molecule to the left side of the equation.
B)Add one water molecule and one hydroxide ion to the left side and increase the coefficient in front of aluminum to 2.
C)Add one water molecule to the left side of the equation and increase the coefficient in front of aluminum to 2.
D)Increase the coefficient in front of aluminum to 2.
6
What is the basis for the oxidation number method of balancing equations?
A)The oxidation numbers are different on each side of the equation.
B)The total increase in the oxidation numbers of oxidized elements equals the total decrease in the oxidation numbers of the reduced elements.
C)The total increase in the oxidation numbers of oxidized elements equals the total increase in the oxidation numbers of the reduced elements.
D)The oxidation numbers of each element are the same on each side of the equation.
7
Which of the following statements about using the oxidation number method to balance redox equations is true?
A)It may be necessary to add H2O and H+ to balance the equation.
B)H2O and H+ must be added to balance the equation.
C)OH- must be added to neutralize the H+ ions present.
D)OH- must be removed to balance the equation.
8
The following reaction occurs in basic solution. In the balanced equation, what is the coefficient of ClO2(aq)?
H2O2(aq) + ClO2(aq) à ClO2-1(aq) + O2(g)

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





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