Chemical changes

Question 1

What are the reactions involving acid n alkali

Answer 1

• acid + metal –> salt + hydrogen
• acid + metal carbonate –> salt + water + carbon dioxide
• acid + base –> salt + water
• acid + alkali –> salt + water (neutralisation)
• alkali + ammonium salt –> salt + water + ammonia

Question 2

What is a precipitation reaction

Answer 2

Insoluble solid formed when 2 solutions are mixed

Question 3

What are the precipitation reaction chemical eqn

Answer 3

• salt solution + another salt solution
• salt solution + alkali ( test for cation)

Question 4

What is oxidation

Answer 4

Substance reacting with oxygen to form a new substance