Electrolysis

Question 1

electrolysis

Answer 1

use of electricity to break down ionic compounds

Question 2

electrolyte

Answer 2

compound broken down

Question 3

electrodes

Answer 3

conducting rods connected to negative or positive terminals of power supply

Question 4

anode

Answer 4

positive electrode

Question 5

cathode

Answer 5

negative electrode

Question 6

positive ions move to the . . .

Answer 6

cathode

Question 7

negative ions move to the . . .

Answer 7

anode

Question 8

what happens to substances with high melting points, instead of being molten compounds?

Answer 8

dissolved

Question 9

problems with dissolving

Answer 9

hard to predict products, as water also produced ions (OH-)

Question 10

when ions reach electrode . . .

Answer 10

loss of charge = elements, gases given off/ metals deposited

Question 11

reduction

Answer 11

gain of electrons (positive ions)

Question 12

oxidation

Answer 12

loss of electrons (negative ions)

Question 13

what happens when 2 products can be formed at an electrode?

Answer 13

less reactive forms

Question 14

extracting aluminium

Answer 14

open mine bauxite, purify and melt aluminium oxide with molten cryolite to lower melting point

Question 15

why must you replace anodes regularly?

Answer 15

oxygen reacts there, producing CO2, burning the anode away