What must be done to be certain that a chemical change has taken place?

a. Check for the production of bubbles before and after the change.

b. Demonstrate that a release of energy occurred after the change.

c. Check the composition of the sample before and after the change.

d. Demonstrate that energy was absorbed by the reactants after the change.

Question

Mckenna Hull

Chemistry

11 August, 20:58

What must be done to be certain that a chemical change has taken place?

a. Check for the production of bubbles before and after the change.

b. Demonstrate that a release of energy occurred after the change.

c. Check the composition of the sample before and after the change.

d. Demonstrate that energy was absorbed by the reactants after the change.

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Answers (1)

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Ricardo Cervantes · Answer 1

The best answer among the choices given is option A. Checking for the production of bubbles before and after the change must be done to make sure that a chemical change happened. Bubbling signifies that gas is evolved and is escaping the liquid phase.