Physical and Chemical Changes

Explain the changes occurring in burning of candle.

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.

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

Explain chemical reaction along with examples.

Explain physical reaction along with examples.

How can we prevent rusting?

What is a chemical change?

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

Why new products are formed in a chemical reaction?

Explain the process of rusting.

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?