Topic 3 - Electrolytic Processes (3.22-3.31)

Question 1

what is reduction

Answer 1

a gain of electrons

Question 2

what is oxidation

Answer 2

a loss of electrons

Question 3

which electrode does reduction occur at

Answer 3

the cathode

Question 4

which electrode does oxidation occur at

Answer 4

the anode

Question 5

Electrolysis definition

Answer 5

a process in which electricity, from a direct current supply, decomposes electrolytes. (molten ionic compound)

Question 6

what electrode do cations go to

Answer 6

cathode

Question 7

what electrode do anions go to

Answer 7

anode

Question 8

what charge is the cathode

Answer 8

negatively charged

Question 9

what charge is the anode

Answer 9

positively charged

Question 10

Explain the formation of products in electrolysis

Answer 10

Ions either gain or lose electrons to lose their ionic charge, forming atoms that once made up the ionic compound

Question 11

which elements are not more reactive than hydorgen

Answer 11

copper, silver and gold

Question 12

what will form at the cathode if the metal is more reactive than hydrogen

Answer 12

hydrogen

Question 13

Why does the mass of the cathode increase, and the mass of the anode decrease? (4 marks)

Answer 13

Anode lost copper as oxidation occurs
Cathode gained copper as reduction occurs
Half equations
Cu --> Cu2+ + 2e-
Cathode = Cu2+ + 2e- --> Cu