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What is an example of a physical factor that can influence the rate of a chemical reaction?
(a)Change in temperature
(b)Change in color
(c)Change in odor
(d)Change in molecular mass

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Important Questions on Changes Around Us
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Classify the following day to day activities based on chemical reactions by physical contact, solutions of reactants, heat, light, electricity and catalyst.
Burning of crackers during festivals.

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Classify the following day to day activities based on chemical reactions by physical contact, solutions of reactants, heat, light, electricity and catalyst.
Copper vessel kept in open air for long time.

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Classify the following day to day activities based on chemical reactions by physical contact, solutions of reactants, heat, light, electricity and catalyst.
Silver ornaments become black on exposure to air for a long time.

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