Question

Give two obres vation that help to detarmine
whether a chenical reaction has taken place ?​

Answer 1

Answer:

1.evolution of gas.

2.change in temperture.

3. change in colour.

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.

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