Question

how do we know that chemical reactions has taken place ?​

Answer 1

Answer:

Some signs of a chemical change are a change in color and the formation of bubbles. The five conditions of chemical change: color change, formation of a precipitate, formation of a gas, odor change, temperature change

Explanation:

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Answer 2

Answer:

By the observing the following we can conclude that a chemical reaction has taken place.

a) If heat is released

.b) If any precipitate formed.

.c) If gas is liberated.

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