Available Answers

1. 1.

   Multiple choice questions:

   1. Milk turning sour is a:
      1. chemical change
      2. reversible change
      3. physical change
      4. none of these
   2. Which of the following is soluble in water?
      1. chalk
      2. kerosene
      3. sand
      4. sugar
   3. The gas that bubbles out of an aerated drink is:
      1. oxygen
      2. carbon dioxide
      3. nitrogen
      4. hydrogen
   4. A molecule can be further broken down into still smaller units called:
      1. matter
      2. atoms
      3. gas
      4. liquid
   5. In which of the following molecules have a lot of freedom to move:
      1. solid
      2. liquid
      3. gas
      4. none of these
2. 2.

   What is meant by matter?
3. 3.

   What is a chemical change? Give some characteristics of chemical changes.
4. 4.

   What are molecules made up of?
5. 5.

   When do we say that liquids are miscible?
6. 6.

   Write two differences between liquids and gases.