Electrolysis

Question 1

What is the name of a positive ion?

Answer 1

cation

Question 2

What is the name of a negative ion?

Answer 2

anion

Question 3

What is the name for the positive electrode that attracts anions (negative ions)?

Answer 3

anode

Question 4

What is the name for the negative electrode that attracts cations (positive ions)?

Answer 4

cathode

Question 5

Electrolysis can only take place in …..

Answer 5

ionic compounds which are:
molten or
in an aqueous solution

Question 6

When you have a molten ionic compound, the beaker only contains which 2 ions?

Answer 6

The positive metal ion (cation)

The negative non metal ion (anion)

Question 7

When you have an aqueous ionic solution (ionic compound in water), the beaker contains which 4 ions?

Answer 7

The positive metal ion (cation)
The negative non metal ion (anion)
Hydroxide ions (OH-) from the water
Hydrogen ions (H+) from the water

Question 8

Name in the 2 ions in the molten compound of lead II bromide

Answer 8

lead (cations)

bromine (anions)

Question 9

Name in the 4 ions in the aqueous solution of Sodium Chloride

Answer 9

sodium (cations)
chlorine (anion)
OH-
H+

Question 10

Name in the 4 ions in the aqueous solution of Copper II Sulphate

Answer 10

copper (cations)
sulphate (anions)
OH-
H+

Question 11

Name in the 4 ions in dilute sulphuric acid

Answer 11

hydrogen (cations)
sulphate (anions)
OH-
H+ (more from the water)

Question 12

In an ionic solution (in water), what will be deposited at the anode (positive electrode)

Answer 12

oxygen (from the water)

unless halide ions are present then the halogen will be deposited

Question 13

In an ionic solution (in water), what will be deposited at the cathode (negative electrode)

Answer 13

hydrogen (from the water)
unless copper, silver or gold ions are present, then these atoms will be deposited as they are less reactive than hydrogen