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Additional resources for Abridged Science for High School Students. The Nuclear Research Foundation School Certificate Integrated, Volume 1

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Let us start our investigation of matter by heating it. THE EFFECTS OF H E A T I N G MATTER Place a few pieces of ice in a test tube. Gently heat the tube until the ice melts. Now stop and think for a few moments. Heating the ice has obviously caused a change in the ice, but how much of a change is it? The melted ice is essentially the same stuff as the ice before it melted. It would be a simple matter to change the melted ice back to solid ice by taking away the heat which caused it to melt. You could do this by placing it in a refrigerator.

No matter how hard you push, the water cannot be squeezed. It is just about impossible to compress it. How would we explain this behaviour of liquids? If we think of a liquid as being made up of particles, as we did for a gas, they would have to be much closer together, with little or no space to allow for compression. The same must be true for a solid material. Solids are also difficult to compress except of course solids like sponges or wood with air spaces in them. o u r particle picture is now just a little more complicated.

5. What is happening to the movement of water particles during the evaporation of water from an open container? 12. Name the changes of state involved in the following processes:— 6. Why does water evaporate more rapidly from the surface in a wide shallow pan than from the mouth of a bottle with a narrow neck? 7. The driver of a motor car pulls into a petrol station after a fast journey on a hot day. He asks the attendant to check the tyre pressures. What is he likely to find out about these pressures and can you explain why this has happened?

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