Solid: In a solid, molecules are packed closely together in a fixed arrangement. They have a relatively low amount of energy and do not move around much.
Liquid: In a liquid, molecules are still close together but are able to move around each other. They have more energy than in a solid and can move around freely.
Gas: In a gas, molecules are spaced far apart and move around rapidly. They have the highest amount of energy and move around in random directions.
Describe the differences between the energy, spacing and movement of molecules in a solid, a liquid, and a gas. (5 marks)
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