Periodic Table
Standard Reduction Potentials
4 HCl(aq) + MnO2(s) MnCl2(aq) + 2 H2O(l) + Cl2(g)
The manganese is a) reduced and its oxidation number changes from +4 to +2 b) reduced and its oxidation number changes from +2 to +4 c) oxidized and its oxidation number changes from +4 to +2 d) oxidized and its oxidation number changes from +2 to +4
2. Given the reaction:
Pb(s) + Cu2+(aq) Pb2+(aq) + Cu(s)
What is the reducing agent? a) Pb2+(aq) b) Cu2+(aq) c) Pb(s) d) Cu(s)
3. What occurs when an atom is oxidized in a chemical reaction? a) a loss of electrons and a decrease in oxidation number b) a loss of electrons and an increase in oxidation number c) a gain of electrons and a decrease in oxidation number d) a gain of electrons and an increase in oxidation number
4. Given the reaction:
2 Al(s) + 3 Ni2+(aq) 2 Al3+(aq) + 3 Ni(s)
What is the total number of moles of electrons lost by 2 moles of Al(s)? a) 6 b) 2 c) 3 d) 8
5. What is indicated when a chemical cell's voltage (E) has dropped to zero? a) The concentration of the reactants has increased. b) The concentration of the products has decreased. c) The cell reaction has reached equilibrium. d) The cell reaction has completely stopped.
6. Which of the following ions is the weakest oxidizing agent? a) Au3+ b) Cr3+ c) Hg2+ d) Ba2+
7. Given the redox reaction:
2 Cr(s) + 3 Cu2+(aq) 3 Cr3+(aq) + 3 Cu(s)
Which reaction occurs at the cathode in an electrochemical cell? a) reduction of Cu2+(aq) b) reduction of Cu(s) c) oxidation of Cr3+(aq) d) oxidation of Cr(s)
8. Given the cell reaction:
2 H2O(l) 2 H2(g) + O2(g)
The cell is best described as a) an electrolytic cell in which an exothermic reaction occurs b) an electrolytic cell in which an endothermic reaction occurs c) a galvanic cell in which an exothermic reaction occurs d) a galvanic cell in which an endothermic reaction occurs
9. Which metal is used as a coating on steel to limit corrosion? a) Na b) Ca c) K d) Zn
10. Given the nickel-cadmium battery reaction:
2 NiOOH + Cd + 2 H2O 2 Ni(OH)2 + Cd(OH)2
What occurs during discharge in the nickel-cadmium battery? a) Ni3+ is reduced to Ni2+. b) Ni2+ is reduced to Ni3+. c) Ni3+ is oxidized to Ni2+. d) Ni2+ is oxidized to Ni3+.
Score = Correct answers:
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