Available Answers

1. 1.

   Fill in the blanks.

   1. Burning of wax is a/an _______________ change.
   2. The wax acts as a _______________ when the candle is lit.
   3. Ice in a refrigerator is a _______________ change.
   4. _______________ is a corrosive process.
   5. The protective coating of _______________ prevents rusting of iron.
2. 2.

   State T for true and F for false statements.

   1. Burning of candle is a physical change.
   2. Rusting occurs in absence of oxygen.
   3. Oil painting prevents rusting of iron bucket.
   4. Crystallisation can occur only in a saturated solution.
   5. Heat is evolved in endothermic changes.
3. 3.

   How can we say that burning of a candle is a chemical change?

4. 4.

   Breaking of a glass jar is a physical change. Explain.

5. 5.

   Spoilage of fruits is a chemical change. Explain.

6. 6.

   What is pasteurisation?