1) The spaces between particles of matter are largest in which material at room temperature?

2) Water is poured into four dishes. In two of the dishes the water has a small surface area
and in the other two it has a large surface area. The water in two of the dishes is cool
and the water in the other two is warm. From which dish does the water evaporate the
quickest?

3) Four metal cans are identical except for the colour and the texture of their outer
surfaces. 100 cm³ of water at 70 ºC is poured into each can. Which cools the most
rapidly?

4) Extremely small pollen grains in water are viewed through a microscope. The grains are
seen to move continually and randomly. What is the reason for this random movement?

5) A house, built in a country with hot, sunny climate, stays cool in the day.

Which materials for the exterior walls and outside colours will help keep the house coolest?"