List the observations that helps us to determine when a chemical reaction has taken place. [3 MARKS]

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Solution

Each point: 1 Mark

1. Change in state and colour.

2. Evolution of a gas

3. Change in temperature.

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List the observations that helps us to determine when a chemical reaction has taken place. [3 MARKS]

Which of the following observations help us to determine whether a chemical reaction has taken place or not?

(i) Change in state.

(ii) Change in colour.

(iii) Change in shape

(iv) Evolution of gas.

(v) Change in temperature.

How do we come to know that a chemical reaction has taken place

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