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Write the chemical formula of blue vitriol.
Explain the changes occurring in burning of candle.
Setting of curd is regarded as a chemical change, explain why?
Apart from new products, many other things accompany a chemical change, what are those things?
Explain why burning of wood and cutting it into small pieces are considered as two different types of changes.
How can we prevent rusting?
Explain chemical reaction along with examples.
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.
Why new products are formed in a chemical reaction?
Explain the process of rusting.
What is a chemical change?