1Why does the volume of most substances increase when they are heated? Explain in terms of particles.
2In the iron ball and ring experiment, what is observed when the ball is heated and when it is cooled? What happens to the speed of the molecules in the ball and the distance between them?
3What is meant by the anomalous expansion of water?
4Why is the density of water greatest at 4°C?
5What happens to the volume and density of water at 4°C when it is heated to 8°C, and when it is cooled to 1°C?
6How do fish and other aquatic animals survive in winter when the surface of a lake freezes?
7Why do water pipes burst in winter in very cold places?
8Why does a glass bottle filled with water crack when it is kept in a deep freezer?
9If water only contracted on cooling, like other liquids, what would happen to the living things in a lake in winter?
10What is the difference between expansion and contraction? Give one example of each.