Class 10th science chapter-1 Chemical reactions and equations Top definitions : 1 . Chemical reaction : A chemical reaction involves a chemical change in which substances react to form new substances with entirely new properties , Substances that react or take part in the reaction are known as reactants and the Substances formed are known as products . 2 . Physical change : If a change involves change in colour or state but no new substance is formed , then it is a physical change . 3 . Chemical change : If a change involves formation of new substances , it is a chemical change . 4 . Chemical equation : The symbolic representation of a chemical reaction is called a chemical equation . 5 . Exothermic and endothermic...
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