Question

A chemical change is accompanied by
a) heat
b) gas
c) sound
d) all of these
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Answer 1

Answer:

I think the answer should be (d ) all of these

Explanation:

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Answer 2

Answer:

A chemical reaction is usually accompanied by easily observed physical effects, such as the emission of heat and light, the formation of a precipitate, the evolution of gas, or a color change.

Explanation:

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