ELECTROLYSIS

Question 1

what is electrolysis

Answer 1

passing an electrical current through a substance to cause oxidation and reduction at the electrodes

Question 2

what is an electrolyte

Answer 2

liquid or a solution that contains an ionic compound where the ions are free to use

Question 3

which electrode is positive

Answer 3

anode

Question 4

which electrode is negative

Answer 4

cathode

Question 5

what happens at the positive electrode and is it oxidation or reduction

Answer 5

negative ions go to anode and are discharged. When they are discharged they turn into an element and go into the atmosphere

oxidised

Question 6

are ions reduced or oxidised at the cathode

Answer 6

oxidised

Question 7

why do electrodes have to be replaced

Answer 7

oxygen reacts with carbon from positive electrodes forming carbon dioxide causing them to burn away

Question 8

what substance reduces the melting point and makes electrolysis cheaper

Answer 8

cryolite

Question 9

what happens at the cathode in electrolysis with a solution

Answer 9

if a element is more reactive than hydrogen
hydrogen will be reduced at the cathode

Question 10

what happens at the anode in electrolysis with a solution

Answer 10

if there is a halogen present it will be oxidised at the anode
if there is no halide oxygen will be produced