electrolysis

Question 1

what is electrolysis

Answer 1

the breaking down of a compound using electricity

Question 2

what is an anode

Answer 2

positive electrode which attracts negative ions- anions

Question 3

what is a cathode

Answer 3

negative electrode which attracts positive ions- cations

Question 4

what must electrode be made from

Answer 4

a solid that conducts electricity but is inert

Question 5

what is an electrolyte

Answer 5

the substance to be broken down - needs to conduct electricity

Question 6

what are the only compounds that conduct electricity

Answer 6

ionic compounds that are molten or dissolved so the ions are free to move

Question 7

what happens at the anode

Answer 7

oxidation, as the non metal has lost electrons to form molecules - neural

Question 8

what happens at the cathode

Answer 8

reduction as the metal ions have gained electrons to form atoms - neural

Question 9

equation at the anode

Answer 9

2Cl -> Cl2 + 2e-

Question 10

equation at the cathode

Answer 10

Al3+ + 3e- —> Al

Question 11

what reacts at the anode in aqueous solutions

Answer 11

if a halide is present then the halide, if not then the hydroxide is

Question 12

what reacts at the cathode in aqueous solutions

Answer 12

if a metal less reactive then hydrogen is present then the metal, if not then the hydrogen

Question 13

what can water dissociate to form

Answer 13

hydrogen and hydroxide

Question 14

what is left over in the aqueous solution

Answer 14

ions that didn’t react