Chem 1 - electrolysis

Question 1

What is the negative electrode called?

Answer 1

Cathode

Question 2

What is the positive electrode called?

Answer 2

Anode

Question 3

What is a negative ion called?

Answer 3

Anion

Question 4

What is a positive ion called?

Answer 4

Cation

Question 5

What electrode are metals attracted to?

Answer 5

The anode

Question 6

What electrode are non metals attracted to?

Answer 6

The cathode

Question 7

Oxidation occurs at which electrode?

Answer 7

Anode

Question 8

Reduction occurs at which electrode?

Answer 8

Cathode

Question 9

What’s the term for hydroxide ions ?

Answer 9

OH -

Question 10

What is the term for hydrochloric acid?

Answer 10

Hcl

Question 11

What is the term for nitric acid

Answer 11

HNO3

Question 12

What is the equation for sulphuric acid?

Answer 12

H2 SO4

Question 13

What is the 4 steps for electrolysis?

Answer 13

1. Pour enough copper chloride into a beaker so that it is around 3/4 full.
2. Insert two carbon graphite electrodes into the beaker and make sure they do not touch.
3. Attach crocodile leads to the rods and connect to a 4volt power supply and switch on.
4. At cathode - copper should be seen discharging and at the anode bubble gas should be seen and chlorine smelt in the air

Question 14

How do you électrolyse sodium chloride?

Answer 14

Repeat the same beginning steps for electrolysis but with sodium chloride solution.
At anode chlorine is discharged and at cathode hydrogen is produced as sodium is higher than hydrogen.

Question 15

What are the rules for the electrodes discharging metals / non metals in electrolysis?

Answer 15

At cathode - hydrogen is produce if the metal is more reactive than hydrogen but if the metal is less reactive than that metal is produced.
At anode - halide ions will form their gas so (F-, Cl-, Br- etc.) but OH- ions will form oxygen gas.