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In most cases, removing water is a physical change rather than a chemical change. This is often no more than a drying process where water evaporates from a substance.

However there are some chemical reactions that remove water from a substance. Of course, the substance itself will also change in this case. An example is copper sulphate. Its normal composition includes water (CuSO4 pentahydrate) but as it is heated, it loses water molecules and becomes CuSO4 trihydrate.

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