C6 Electrolysis

Question 1

what electrode is negative

Answer 1

cathode

Question 2

what electrode is positive

Answer 2

anode

Question 3

in electrolysis of an an aqueous solution what will form at the anode if the solution contains a halide

Answer 3

the halide

Question 4

in electrolysis of an an aqueous solution what will form at the anode if the solution DOESNT contains a halide

Answer 4

oxygen

Question 5

in electrolysis of an an aqueous solution what will form at the cathode if the solution contains a metal LESS reactive then hydrogen

Answer 5

the metal that’s less reactive then hydrogen (copper)

Question 6

in electrolysis of an an aqueous solution what will form at the cathode if the solution contains a metal MORE reactive then hydrogen

Answer 6

hydrogen

Question 7

what’s mixed with aluminium oxide during electrolysis to lower the melting point

Answer 7

cryolite

Question 8

what occurs at the anode oxidation or reduction

Answer 8

oxidation- electrons are lost

Question 9

what occurs at the cathode oxidation or reduction

Answer 9

reduction- electrons are gained

Question 10

what’s the half equation at the cathode when hydrogen is produced

Answer 10

2H+ + 2e- -> H2

Question 11

what’s the half equation at the anode when hydroxide ions are electrolysed

Answer 11

4 OH- —> 2 H2O + O2 + 4 e-