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Write the chemical formula of blue vitriol.
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?
Explain why burning of wood and cutting it into small pieces are considered as two different types of changes.
Which one is better technique to obtain sugar from sugar solution- crystallization or evaporation to dryness?
Explain chemical reaction along with examples.
Explain physical reaction along with examples.
Why new products are formed in a chemical reaction?
Explain the process of rusting.
How can we prevent rusting?
State the condition necessary for the occurrence of any reactant.
What is a chemical change?