Question

Which of the following describe a chemical change? (Select all that apply) Melting of ice Evaporation...

  1. Which of the following describe a chemical change? (Select all that apply)
    1. Melting of ice
    2. Evaporation of alcohol when a table is wiped with an alcohol swab
    3. Burning of firewood
    4. Rusting of iron
    5. Breaking a glass
    6. Cooking an egg
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Answer #1

A chemical change involves change in chemical composition of the substance. On this bases the following change is chemical change

1. Burning of firewood. firewood is converted to CO2 and H2O, and the change cant be reversed

2. Rusting of iron is a chemical change. An iron oxide is formed from iron metal in presence of moisture and oxygen

3. Cooking of egg. Denaturation of protiens takes place.

All other changes are physical.

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