Question 1

What name is given to the process of using electricity to extract elements from a compound?

Accepted Answer

electrolysis

Answer

fractional distillation

Answer

galvanising

Answer

electrolysing

Question 2

What is the name of the positive electrode?

Accepted Answer

anode

Answer

cathode

Answer

anion

Answer

cation

Question 3

What is the name of the negative electrode?

Accepted Answer

cathode

Answer

cation

Answer

anion

Answer

anode

Question 4

What is an electrolyte?

Accepted Answer

liquid or solution that contains ions and so can conduct electricity

Answer

liquid or solution which generates light when electric current is passed through it

Answer

substance which contains ions so can generate electrical energy

Answer

liquid or solution that contains electrons and so can conduct heat

Question 5

Where are metals formed in electrolysis?

Accepted Answer

cathode

Answer

cation

Answer

anion

Answer

anode

Question 6

Where are non-metals formed in electrolysis?

Accepted Answer

anode

Answer

anion

Answer

cathode

Answer

cation

Question 7

What needs to happen to ionic substances before direct current through can be passed them in electrolysis?

Accepted Answer

melted or dissolved to form a solution

Answer

cooled, to reduce the loss of heat from the current passing through it

Answer

filtered to remove impurities

Answer

reacted with another ionic compound

Question 8

Solid ionic substances cannot be electrolysed as they do not conduct electricity. Which of these points explains why?

Accepted Answer

the ions cannot move

Answer

the equal numbers of positive and negative ions balance out

Answer

the substances do not have enough energy

Answer

the delocalised electrons in the substance are fixed

Question 9

In the electrolysis of solutions, when is the metal NOT produced at the cathode?

Accepted Answer

when the metal is more reactive than hydrogen

Answer

when the metal is less reactive than carbon

Answer

when the metal is more reactive than carbon

Answer

when the metal is less reactive than hydrogen

Question 10

In the electrolysis of a metal halide solution, what is produced at the anode?

Accepted Answer

halogen

Answer

hydrogen

Answer

metal

Answer

oxygen

Question 11

In the electrolysis of a metal sulfate solution, what is produced at the anode?

Accepted Answer

oxygen

Answer

hydrogen

Answer

metal

Answer

sulphate

Question 12

What is the half equation for the ionisation of water?

Accepted Answer

$	ext H_2	ext O(	ext l)  ightarrow 	ext H^+(	ext {aq}) + 	ext {OH}^−(	ext {aq})$

Answer

$	ext {OH}^-(	ext {aq}) ightarrow 	ext{H}_2	ext{O}(	ext {aq})+	ext H^+(	ext {l})$

Answer

$	ext H_2	ext O(	ext l)  ightarrow 	ext H^-(	ext {aq}) + 	ext {OH}^+(	ext {aq})$

Answer

$	ext H^+(	ext {aq}) + 	ext {OH}^-(	ext {aq})  ightarrow 	ext{H}_2	ext{O}(	ext l) $

Question 13

What kind of metals are extracted from ionic compounds by using electrolysis?

Accepted Answer

metals that are more reactive than carbon

Answer

metals that are less reactive than carbon

Answer

metals that are more reactive than hydrogen

Answer

all transition metals

Question 14

In the electrolysis of aluminium oxide, why is the aluminium oxide mixed with cryolite?

Accepted Answer

to lower the melting point

Answer

to increase the conductivity

Answer

to increase the melting point

Answer

to lower the boiling point

Question 15

In the electrolysis of aluminium oxide, what are the anodes made of?

Accepted Answer

graphite

Answer

steel

Answer

iron

Answer

copper

Question 16

In the electrolysis of aluminium oxide, why do the anodes need to be replaced?

Accepted Answer

they react with the oxygen being formed to produce carbon dioxide

Answer

they lose their conductivity as they are damaged by the molten cryolite

Answer

they melt into the electrolyte

Answer

they react with the oxygen being formed to produce carbon monoxide

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