Question

we need not now that chemical change​

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

Answer:

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chemical change:

This is a type of change when a chamical reaction occur it cant be get again by any methord just like physical change.