Question

short definition of chemical change class 7​

Answer 1

Answer:

Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. ... An example of a chemical change is the reaction between sodium and water to produce sodium hydroxide and hydrogen.

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Answer 2

Required Answer:

☑A change in which one or more new substances are formed is called as a chemical change. Usually a chemical change involves a chemical reaction, which forms new products. Example : Rusting of Iron, or burning wood.