Natural and Chemical Changes - Science, Grade 8, SSC Board

Front

What is a natural change?

Back

A natural change is a change that occurs in nature without human intervention, such as the changing of seasons or the growth of plants.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances, such as rusting of iron or burning of wood.

Front

Can you give an example of a natural change?

Back

An example of a natural change is the process of photosynthesis in plants.

Front

Can you give an example of a chemical change?

Back

An example of a chemical change is the reaction between vinegar and baking soda.

Front

Is melting ice a natural or chemical change?

Back

Melting ice is a natural change because it is a physical change that does not alter the chemical composition of water.

Front

Is burning paper a natural or chemical change?

Back

Burning paper is a chemical change because it transforms the paper into ash and smoke, creating new substances.

Front

Is rusting of iron a natural or chemical change?

Back

Rusting of iron is a chemical change because it involves a reaction with oxygen that produces iron oxide, a new substance.

Front

What happens during evaporation?

Back

During evaporation, a liquid changes into a gas at temperatures below its boiling point, which is a physical change.