Question

Which statement is true about physical and chemical changes?

a. Physical changes can change both physical and chemical properties.
b. Physical and chemical changes can not happen at the same time
c. Chemical changes are not observable
d. Chemical changes always produce new substance

Answer 1

Answer:

The statement is true about physical change is

(b)

the statement is true about chemical change is (d)

And the clear ans is (B)

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Answer 2

Answer:

1)true

2)false

3)false

4)true

Explanation:

points were less for this question