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a)a process that involves rearrangement of the molecular or ionic structure of a substance, as distinct from a change in physical form or a nuclear reaction
b)A chemical equation is the symbolic representation of a chemical reaction in the form of symbols and formulae,
Explanation:
c)a substance that takes part in and undergoes change during a reaction.
d) During a chemical reaction reactants are transformed into products after passing through a high energy transition state
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