Question

a chemical reaction take place when

1 two substance react together to form a new compound.

2 a compound breaks down into simple substances

3 both of these

4 none of these ​

Answer 1

Answer:

3 both of these

Explanation:

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Answer 2

3rd is the right answer.

Explanation;1) When two or more substance react together it form a compound.

Ex: Mg + O2 → MgO

Explanation;2) compound breaks into simpler substance .

Ex: H2O → H2O + O2

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