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1. Which of the following when dissolved in water and placed in the conductivity apparatus would cause the light to glow?
A. table saltB. ethyl alcoholC. sugarD. glycerineE.
2. In question 1, the reason that a current could flow is that
A. ions combine to form moleculesB. molecules migrate to the charge platesC. ions migrate to the charge platesD. sparks cross the gapE.
3. The extent of ionization depends on the
A. nature of the solventB. nature of the soluteC. concentration of the solutionD. temperature of the solutionE. all of the above
4. Which of the following is TRUE?
A. The number of positive ions in solution equals the number of negative ions.B. The positive ions are called anions.C. The positive ions are called cathodes.D. The total positive charge equals the total negative charge in solution.E. None of the above
5. The hydronium ion is represented as
A. H2O+B. H3O+C. HOH+D. H-E.
6. In the electrolysis of copper chloride, the substance liberated at the anode is
A. copperB. chlorineC. hydrogenD. copper chlorideE.
7. Ions are particles that exist
A. only in water solutionsB. in some crystalsC. in polar covalent compoundsD. in covalent compounds that are not polarE.
8. Ionic compounds will conduct an electric current when they are
A. solidifiedB. meltedC. frozenD. dehydratedE.
9. The cathode in an electrochemical cell is the electrode that is
A. always negativeB. always positiveC. always neutralD. the electrode at which reduction takes placeE.
10. Electrolysis of a dilute solution of sodium chloride results in the cathode product
11. Electrode potentials are:
Zn0 → Zn2+ + 2e- E0 = + 0.76 V
Au0 → Au3+ + 3e- E0 = -1.42 V
If a gold foil were placed in a solution containing zinc ions, the reaction potential would be calculated to be
A. -1.34 V (no reaction)B. -2.18 V (no reaction)C. -0.66 V (no reaction)D. +2.18 V (reaction)E. +1.34 V (reaction)
12. A positive reaction potential indicates that
A. the reaction will not occurB. the reaction will occur and give off energyC. the reaction will occur if heat or energy is addedD. the reaction will power an outside alternating electric currentE.
13. The following elements are listed in order of decreasing reactivity as they appear in the electrochemical series.
Ca, Na, Mg, Zn, Fe, H, Cu, Hg, Ag, Au
The element that is the best reducing agent and the easiest to oxidize is
A. CaB. AuC. HD. FeE. Cu
14. The following elements are listed in order of decreasing reactivity as they appear in the electrochemical series.
Of the following, the element that does NOT react with hydrochloric acid to produce hydrogen gas is
A. ZnB. FeC. HgD. CaE. Mg
15. The following elements are listed in order of decreasing reactivity as they appear in the electrochemical series.
In the electrochemical cell shown above, which of the following half-reactions occurs at the anode?
(A)Cu2+ + e- → Cu+B.
(B)Zn(s) → Zn2+ + 2e-C.
(C)Zn2+ + 2e- → Zn(s)D.
(D)Cu(s) → Cu2++2e-E.
(E)Cu2+ + 2e- → Cu(s)
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