Physical and Chemical Changes | Study

Chemical Changes are changes in which the composition and chemical properties of the substance get changed.

In chemical changes new substances are produced. The most of the chemical changes are irreversible and permanent.

Note: Some chemical changes are reversible, known as reversible chemical changes.

Example: burning of a candle, formation of curd from milk, ripening of fruits.

Some Chemical Reactions in daily life:

Rusting of Iron: Rusting is the process in which iron turns into iron oxide.

It happens when iron comes into contact with water and oxygen. The process is a type of corrosion that occurs easily under natural conditions.

Prevention of Rusting:

1. By Painting
2. By Oiling and greasing
3. By Chromium plating
4. By Galvanizing
5. By Alloying

Cooking of food: Cooking causes breakdown of complex molecules of carbohydrates, fats and proteins into smaller molecules.

It is regarded as a decomposition reaction.

Cooked food is easier to digest than uncooked food.

3. Decay of Organic Substances: Microorganisms like fungi and bacteria produce enzymes which break down complex organic compounds into smaller substances.

It is also regarded as a decomposition reaction.

Some substances can be obtained in pure state from their solutions by crystallization.