Physical and Chemical Changes

Write the chemical formula of blue vitriol.

Explain why burning of wood and cutting it into small pieces are considered as two different types of changes.

Explain chemical reaction along with examples.

Explain the changes occurring in burning of candle.

Apart from new products, many other things accompany a chemical change, what are those things?

Setting of curd is regarded as a chemical change, explain why?

How can we prevent rusting?

Explain physical reaction along with examples.

State the condition necessary for the occurrence of any reactant.

Which one is better technique to obtain sugar from sugar solution- crystallization or evaporation to dryness?

Explain the process of rusting.

Why new products are formed in a chemical reaction?

What is a chemical change?