You can compress a substances in the gas state, but not in the solid or liquid state. Use the particle theory to explain why？

Because there is lots of free space between particles, gases can easily be compressed. Because there aren't many particles in a large volume, gases have very low densities typically 1000 times less than in their condensed state as solid or liquid at atmospheric temperature and pressure.

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- aluminum and copper chloride.

- the chloride ion to separate the aluminum from the oxygen so that the aluminum can react with the copper ions (and the water molecules).