Chemistry

Question 1

1Ions are preferentially discharged at the cathode if they are

Hard

A. higher in the electrochemical series B. larger C. lower in the electrochemical series D. anions

Question 2

2Solid sodium chloride conducts electricity.

Easy

A. True B. False

Question 3

3E°(Cu²⁺/Cu) = +0.34 V and E°(Zn²⁺/Zn) = −0.76 V. The e.m.f. of the Zn/Cu cell is ___ V.

Hard

Your answer (fill in the blank)

Question 4

4Electrolysis is

Easy

A. the decomposition of an electrolyte by an electric current B. the dissolving of a salt C. the flow of electrons in a metal D. burning a substance

Question 5

5In a Daniell cell (Zn/Cu), the negative electrode is

Medium

A. the copper sulphate B. the salt bridge C. copper D. zinc

Question 6

6In electrolysis, anions move to the anode.

Easy

A. True B. False

Question 7

7In the electrolysis of molten lead(II) bromide, the product at the cathode is

Easy

A. oxygen B. bromine C. lead D. hydrogen

Question 8

8An electrolyte is a substance that

Easy

A. never conducts B. is always a metal C. conducts in the solid state D. conducts electricity when molten or in solution and is decomposed

Question 9

9Coating a metal object with a thin layer of another metal by electrolysis is called ___.

Easy

Your answer (fill in the blank)

Question 10

10The dry Leclanché cell uses

Hard

A. two copper electrodes B. zinc as the negative and carbon as the positive electrode C. lithium and cobalt D. lead and lead oxide