Electrolysis

Question 1

Explain how electrolysis functions

Answer 1

electrolysis breaks down compounds into simpler compounds. Ionic substances are decomposed by an electrical charge in electrolysis

Question 2

How can ions move freely in electrolysis?

Answer 2

The compounds must be molten or in a solution for ions to move freely

Question 3

(1 i) What is produced at the anode and cathode in a molten solution?

Answer 3

sodium - cathode

chlorine - anode

Question 4

(ii) Which ions are present in molten sodium chloride?

Answer 4

only sodium and chlorine ions

Question 5

(2 i) In a sodium chloride solution, what is produced at the anode and cathode?

Answer 5

chlorine - anode

hydrogen - cathode

Question 6

(2ii) which ions are present in sodium chloride solution?

Answer 6

hydrogen, hydroxide, sodium and chlorine

Question 7

Explain what happens in the equilibrium process

Answer 7

When metals are placed in water, metal atoms will lose electrons and become positive . This will attract negative electrons back to the metal

Question 8

The potential difference for magnesium is bigger for magnesium than copper. Explain why this happens

Answer 8

magnesium is higher in the electrochemical series so it can push away more electrons than copper

Question 9

why is hydrogen gas more likely to be discharged and where is hydrogen gas produced.

Answer 9

the lower the metal is in the electrochemical series, the more likely it is to be discharged / its produced at the cathode

Question 10

in a concentrated solution containing chloride ion, what ion will be discharged?

Answer 10

chloride ion will be discharge than hydroxide ion.