chemical changes (not complete)

Question 1

what is reduction

Answer 1

the loss of oxygen

Question 2

how can Mg(s) + Cu2+(aq) → Mg2+(aq) + Cu(s) be rewritten

Answer 2

Mg(s) → Mg2+(aq) + 2e- (oxidation)

Cu2+(aq) + 2e- → Cu(s) (reduction)

Question 3

what is a redox reaction

Answer 3

when reduction and oxidation happen at the same time

Question 4

how is a metal extracted if it’s less reactive than carbon

Answer 4

heated with carbon, carbon is oxidised and the metal oxide is reduced

Question 5

how is aluminium extracted

Answer 5

using electrolysis

Question 6

what happens when an acid reacts with a metal

Answer 6

acid + metal –> salt + hydrogen

Question 7

what are half equations for acids with metals

Answer 7

Mg(s) → Mg2+(aq) + 2e- (oxidation)

2H+(aq) + 2e- → H2(g) (reduction)

Question 8

what happens when an acid reacts with metal oxide

Answer 8

salt and water is produced

Question 9

what happens when an acid reacts with an alkali

Answer 9

salt + water is produced

Question 10

what happens when an acid reacts with a carbonate

Answer 10

salt + water + carbon dioxide is produced

Question 11

how to name a salt

Answer 11

first part - base, alkali or metal carbonate

second part - acid