When a chemical change occurs new substances are formed., Chemical changes are almost always irreversible., A permanent colour change is a sign of a chemical change., The release of a gas is a sign of a chemical change., Gas can be observed as bubbles, fizzing or as a smell., A precipitate is a solid that forms from a solution., A precipitate is a sign of a chemical change., If light or heat is observed it is a sign of a chemical change., A change in temperature (either hotter or cooler) is a sign of a chemical change. , The bonds holding atoms together are broken and re-arranged during a chemical change.,

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