Allied solutions

Allied solutions

Grade 7

Matter and its Composition | Exercise

Question 10

Q10) Describe the simple experiments to show that -

(a) Particles of matter have intermolecular attraction

(b) Particles of matter closely packed in solids and less in liquids.

Solution :

(a) To show - Particles of matter have intermolecular attraction.

Experiment - Mercury globules are placed in a petri dish and kept apart. The petri shakes slowly and mercury globules come together to for a big globule.

The formation of big globules shows that forces of attraction exist between the molecules.

(b) To show - Particles of matter closely packed in solids and less in liquids.

Experiment - A measuring cylinder with 100ml of water is taken and solid sugar crystals are added to it. The solution is stirred carefully to form a sugar solution.

It is observed that volume of water does not change which shows that sugar fills up the intermolecular spaces between water molecules. Hence the water level does not change proving that the intermolecular spaces are more in liquids as compared to solids.

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subject-cta

Question 10

Q10) Describe the simple experiments to show that -

(a) Particles of matter have intermolecular attraction

(b) Particles of matter closely packed in solids and less in liquids.

Solution :

(a) To show - Particles of matter have intermolecular attraction.

Experiment - Mercury globules are placed in a petri dish and kept apart. The petri shakes slowly and mercury globules come together to for a big globule.

The formation of big globules shows that forces of attraction exist between the molecules.

(b) To show - Particles of matter closely packed in solids and less in liquids.

Experiment - A measuring cylinder with 100ml of water is taken and solid sugar crystals are added to it. The solution is stirred carefully to form a sugar solution.

It is observed that volume of water does not change which shows that sugar fills up the intermolecular spaces between water molecules. Hence the water level does not change proving that the intermolecular spaces are more in liquids as compared to solids.

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subject-cta
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