Electrolysis (RP)

Question 1

What are we finding out in the electrolysis experiment

Answer 1

what is formed at the positive and negative electrode for each electrolyte

Question 2

Method for electrolysis experiment

Answer 2

add 50cm² electrolyte solution, add anode and cathode and turn on power supply 6V for 2 mins, test gas bubbles on anode (blue litmus paper bleaches = chlorine if no effect = oxygen), see if there are bubbles (hydrogen gas) or solid deposit (metal) at the cathode

Question 3

Electrolysis experiment control variables

Answer 3

volume of electrolyte solution, concentration of electrolyte solution, duration of power pack

Question 4

Electrolysis experiment dependant variables

Answer 4

substances formed at the anode and cathode

Question 5

Electrolysis experiment independent variables

Answer 5

type of electrolyte solution

Question 6

Anode prediction for copper chloride

Answer 6

chlorine because chlorine negative is less reactive than hydroxide

Question 7

Cathode prediction for copper chloride

Answer 7

copper because copper is positive and less reactive than hydrogen

Question 8

Anode prediction for copper sulfate

Answer 8

oxygen because oxygen is negative and less reactive than sulfate

Question 9

Cathode prediction for copper sulfate

Answer 9

copper because copper is positive and less reactive than hydrogen

Question 10

Anode prediction for sodium chloride

Answer 10

chlorine because chlorine is negative and less reactive than hydroxide

Question 11

Cathode prediction for sodium chloride

Answer 11

hydrogen because hydrogen is positive and less reactive than sodium