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A chemical change doesn’t always have to have two substances reacting with each other.

Starting with just one substance, it is possible to rearrange the bonding between the atoms to make two or
more new substances.

It is usually necessary to heat the substance to a high temperature before this happens. This change is called decomposition.

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m1: changing
m2: mixing reaction
m3: calcium water
m4: heating reaction
m5: in solution
m6: decomposition
m7: dehydration

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