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Explain the process of rusting.
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.
What is a chemical change?
Explain chemical reaction along with examples.
How can we prevent rusting?
State the condition necessary for the occurrence of any reactant.
Explain physical reaction along with examples.
Why new products are formed in a chemical reaction?
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?
Which one is better technique to obtain sugar from sugar solution- crystallization or evaporation to dryness?