Question 91 Metal ores are isolated from rock by taking advantage of differences

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Question 91

Metal ores are isolated from rock by taking advantage of differences in both physical and chemical properties. Cite examples given in the textbook where differences in physical properties are used.

A.the electrolysis of impure copper metal

B.the addition of carbon to the iron ore blast furnace

C.the addition of oil to a slurry of metal sulfides

D.All of these

Question 92

Container A...... Fe - Fe2+ + 2e-             Container B....... Cu2+ + 2e - Cu

The following set of redox reactions takes place as shown. If you had two containers filled with the ion solution described above with a wire connecting a piece of iron (in container A) and a piece of copper (in container B) and a salt-bridge connecting the two containers, describe what happens.

A.A little bit of iron is converted into iron ions and a little bit of copper ion is converted into copper metal.

B.All of the iron is transformed into iron ions and all of the copper is transformed into copper ions.

C.All of the iron is transformed into iron ions and all of the copper ions are transformed into copper metal.

D.All of the iron ions are transformed into iron metal and all of the copper is transformed into copper ions.

E.All of the iron ions are transformed into iron metal and all of the copper is transformed into copper metal.

Question 93

What type of chemical reaction is involved in converting a metal salt into native metal?

A.an oxidation-reduction reaction

B.an acid-base reaction

C.an ion exchange reaction

D.a phase change N

E.one of these

Question 94

In a battery, the following oxidation-reduction reaction is taking place: What is undergoing reduction as written?

Mn2O3 + ZnO - 2MnO2 + Zn

A.Zn

B.ZnO

C.MnO2

D.Mn2O3

E.None of these

Question 95

Br2 - 2 Br-

Which of the half-reactions below would be complementary, balance the following half-reaction, and be chemically reasonable?

A.2 K 2 K+

B.K+ - K

C.K - K+

D.2 K+ - 2 K

E.K - K2+

Explanation / Answer

91. D

92. A

93. A

94. A

95. A

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