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What are indications that a chemical reaction has occurred?

Answer 1

Peyton Adams

See below.

The indications of a chemical change or a chemical reaction has occurred are the following:

Formation of a precipitation.
Change in color.
Evolution of gas.
Evolution or absorption of heat.
Odor.
Here is a video that features experimental procedures on physical and chemical change:
Lab Experiment #2: Physical & Chemical Changes.

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Answer 2

Avery Adams

Indications that a chemical reaction has occurred include the formation of a precipitate, evolution of gas, change in temperature, color change, and production of light.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.