Paper 1- 3b Electrolysis

Question 1

Oxidation in terms of electrons

Answer 1

oxidation is loss of electrons

Question 2

Reduction in terms of electrons

Answer 2

reduction is gain of electrons

Question 3

Define electrolysis

Answer 3

breaking down an ionic substance

using electricity

Question 4

What is the anode?

Answer 4

the positive electrode

Question 5

What is the cathode?

Answer 5

the negative electrode

Question 6

What the ions in NaCl?

Answer 6

Na+ and Cl-

Question 7

What are the ions in MgO?

Answer 7

Mg2+ O2-

Question 8

What are the ions when water dissociate?

Answer 8

H+ and OH-

Question 9

Rule for the negative electrode with a solution?

Answer 9

If metal is more reactive than hydrogen

Question 10

At the positive electrode….

Answer 10

negative ions

lose electrons

to become atoms

Question 11

At the negative electrode…

Answer 11

positive ions

gain electrons

to become atoms

Question 12

Ions made when water dissociates

Answer 12

H+ and OH-

Question 13

Which ions are in NaCl?

Answer 13

Na + and Cl-

Question 14

What does dissociate mean?

Answer 14

Splits up

Into it’s ions

(usually when dissolved)

Question 15

Which ions are in MgO

Answer 15

Mg 2+ and O-

Question 16

Which ions are in AgCl

Answer 16

Ag+ and Cl-

Question 17

Which ions are in PbBr2

Answer 17

Pb 2+

and 2 x Br-

Question 18

Which ions are in aqueous Na Cl

Answer 18

H+, Na+

OH-, Cl-

Question 19

Rule for the negative electrode

Answer 19

Metal is more reactive than hydrogen = hydrogen formed

Metal is less reactive than hydrogen= hydrogen is formed

Question 20

Rule for the positive electrode

Answer 20

If Grp 7 ion is present it is formed

/If no Grp 7 ion is present oxygen is formed

Question 21

What is the half equation for the production of water in aqueous solution?

Answer 21

4OH- –> O2 + 2H2O + 4e-

Question 22

Ions in hydrochloric acid HCl

Answer 22

H+ and Cl-

Question 23

Ions in sulphruic acid (H2SO4)

Answer 23

H+ and SO4 2-