Physical and Chemical Changes

Explain the changes occurring in burning of candle.

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

Write the chemical formula of blue vitriol.

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

Explain chemical reaction along with examples.

Why new products are formed in a chemical reaction?

How can we prevent rusting?

What is a chemical change?

Explain the process of rusting.

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

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

Explain physical reaction along with examples.

State the condition necessary for the occurrence of any reactant.