Changes
Precipitate appearsIf certain substances appear when mixed together, they can create a precipitate. A precipitate is a solid. E.g sodium carbonate + Magnesium sulfate creates a precipitate.
Temperature Change
When reactants are mixed together, some can cause temperature to rise or to decrease.
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odour changesAnother type of chemical change is the scent or odour. this happens as substaces evaporate or melt. The scent of wax changes when it is melted and is easily noticable as it mixes with oxygen.
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