Question

4 lightning of a matchstick produces light, heat, sound and gases like oxygen and sulphur dioxide.
Which 3 characteristics of chemical reactions does this show?​

Answer 1

Answer:

When a match burns, it undergoes a chemical change. Matches use sulfur, phosphate and a friction agent held together by a binding agent. With a match, heat ignites the phosphorous on the head of the match. To keep the fire going, the match needs more oxygen than is available from the air alone.

Explanation:

Answer 2

Answer:

The sulphur in the head in turn catches fire by reacting with atmospheric oxygen to give sulphur dioxide. The gas that is emitted, when an ordinary matchstick is lit, is, therefore, sulphur dioxide. The cellulose of the matchstick that is subsequently burnt emits CO2gas.

The characteristics which this reaction shows are —

1)Evolution of gas. Some chemical reactions are characterised by the evolution of gas. Evolution of Co2 gas takes place here

2)Formation of precipitate. Some chemical reactions are characterised by the formation of precipitate. Burned wood and sulphur is the precipitate here .

3) Change in temperature. Here there is an increase in temperature hence it's an exothermic reaction.

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