Question

List two examples each of useful and harmful chemical changes​

Answer 1

Examples of Harmful Chemical Reaction

•Bleach and Acid.

•Bleach and Ammonia. Ammonia is a form of base, the chemical opposite of an acid. ...

•Oven Cleaner and Acid. ...

•Fruit Pits.

Examples of usefull Chemical Reactions

•Digestion

•Photosynthesis

•Oxidation which includes rusting.

•Combustion.

Answer 2

Answer:

example of useful chemical change:

• conversion of milk to curd

• cooking of food

example of harmful chemical:

• rusting of iron
• rotting of food