Question

A change which occurs when two substances react chemically and form new substances with difficult properties​

Answer 1

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Explanation:

A chemical reaction is the change of a substance into a new one that has a different chemical identity.

Answer 2

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Chemical changes occur when bonds are broken and/or formed between molecules or atoms. This means that one substance with a certain set of properties (such as melting point, color, taste, etc) is turned into a different substance with different properties.

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