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Up to now, at least one of the reactants has been in either the liquid or gas state.

With the particles of one of the substances moving around, it means there will be collisions with the particles of the other substance.

If two substances in the solid state are mixed together, the particles are stuck with their own kind in 'lumps’ – they cannot get at each other very well.

A way to get round this is to dissolve the substances in water first and then mix the solutions.

not applicable

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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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