Allied solutions

Allied solutions

Grade 6

Matter | Exercise

Question 11

Q11) Give reasons for the following:

(a) Solids have a definite shape and are highly rigid while gases have no definite shape and are least rigid.

(b) Sugar can be distinguished from talcum powder using water.

(c) Water on freezing turns into ice.

(d) A bottle of perfume on opening evolves an odour which can be sensed over a long distance.

Solution :

(a) In solids, the intermolecular spaces are negligible and the atoms move about in their own position which gives solids a definite shape and makes them rigid while in gases, the intermolecular spaces are large which allows the atoms to move around freely and hence, they are least rigid and have no definite shape.

(b) Sugar dissolves in water while talcum powder does not dissolve.

(c) Water has a fixed melting and boiling point.

(d) A bottle of perfume on opening evolves an odour, because gases diffuse into the air very easily and can be sensed over a long distance.

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subject-cta

Question 11

Q11) Give reasons for the following:

(a) Solids have a definite shape and are highly rigid while gases have no definite shape and are least rigid.

(b) Sugar can be distinguished from talcum powder using water.

(c) Water on freezing turns into ice.

(d) A bottle of perfume on opening evolves an odour which can be sensed over a long distance.

Solution :

(a) In solids, the intermolecular spaces are negligible and the atoms move about in their own position which gives solids a definite shape and makes them rigid while in gases, the intermolecular spaces are large which allows the atoms to move around freely and hence, they are least rigid and have no definite shape.

(b) Sugar dissolves in water while talcum powder does not dissolve.

(c) Water has a fixed melting and boiling point.

(d) A bottle of perfume on opening evolves an odour, because gases diffuse into the air very easily and can be sensed over a long distance.

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subject-cta
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