Chemistry, 11.12.2019 13:31 madmar

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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What must be done to be certain that a chemical change has taken place?
a. check for the prod...