Give an example for each change that involves:(a) change in color, (b) evolution of a gas, and (c) production of sound

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Solution

a) Rusting of iron involves a colour change. On leaving a piece of iron in the air, a chemical change takes place and a reddish-brown flaky layer is formed on its surface which is called rust.

b) When baking soda and vinegar are mixed, a chemical change takes place and carbon dioxide gas is released in the form of bubbles.

c) Explosion of fireworks is a chemical change that produces heat, light, sound, and also releases unpleasant gases.

Change in colour

Rusting of iron

Evolution of a gas

Mixture of baking soda and vinegar

Production of sound
Explosion of fireworks

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Similar questions

Q. (a) What is meant by chemical reaction? Explain with the help of an example.
(b) Give one example each of a chemical reaction characterised by:
(i) evolution of a gas
(ii) change in colour
(iii) formation of a precipitate
(iv) change in temperature
(v) change in state.

Question 20

Give an example of a chemical reaction for each of the following situations:
(a) A change in colour is observed.
(b) A gas is evolved
(c) Sound is produced.

Q. Give one example each of a chemical reaction characterised by:
(a) evolution of a gas
(b) formation of a precipitate
(c) change in temperature
Write equations of the reactions which take place in each case.

The chemical reaction between quicklime and water is characterised by :
(a) evolution of hydrogen gas

(b) formation of slaked lime precipitate

(d) change in colour of the product

Q. Give an example for each of a change that involves:
(a) change in colour,
(b) evolution of a gas and
(c) production of sound

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Change in colour	Rusting of iron
Evolution of a gas	Mixture of baking soda and vinegar
Production of sound	Explosion of fireworks