Question

NCERT class 9 science chemistry 1 chapter activities 1.3,1.4.. ........ Please answer.

Answer 1

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1.3

One has to go very close to get the smell of the unlit incense stick.

After lighting the incense stick, smoke started to coming out of it.

Yes now, we can get smell of incense stick sitting at a distance.

This shows that,

Matters consist of small particles which are moving continuously. This means that particles of matter possess kinetic energy.

Smell of lighted incense stick diffuse with air present in air and reaches to us sitting at a distance.

1.4

Ink started mixing with water immediately after adding which is visible in the form of many thread like structures.

Honey slowly directed towards bottom of water.

It takes about one hour to spread colour of ink throughout the water.

This happens because

Ink has about equal or slightly higher density than that of water, so ink started immediately mixing with water, because particles of matters are moving continuously.

Density of honey is very high than that of water, so honey started to direct towards bottom.

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Answer 2

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