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physical change
matter changes shape or state but no new substance is formed
chemical change
a new substance is formed like all chemical reactions
info physical change
no new substance is formed + easy to reverse
info chemical changes
new substance is formed + not easy to reverse
chemical reactions
called reactants the new substance that is formed are called products
signs chemical reactions
change in colour, change in temperature, production of light, emission of sound, distinctive smell + bubbles of gas being produced
law of conservation of mass
states that matter cannot be created or destroyed but can change from one form to another