9th Class Chemistry Chapter 5 Physical States of Matter Short Questions Answer

9th Class Chemistry Chapter 5 Physical States of Matter Short Questions Answer

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What is diffusion, explain with an example?

Diffusion is the movement of solute particles from their higher concentration or lower concentration in a medium.
Example: When a few drops of ink are added in beaker of water, ink molecules move around and after a while spread in whole of the beaker. Thus diffusion has taken place.

Define standard atmospheric pressure, what are its units? How it is related to Pascal?

Standard atmospheric pressure: It is the pressure exerted by the atmosphere at the sea level. It is defined as the pressure exerted by a mercury column of 760mm in height at sea level. It is sufficient pressure to support a column of mercury 760mm in height at sea level.
One atmosphere (1atm)
1atm = 760 mm = 760torr
1mm Hg = 1torr
One Pascal (1 Pa)
1 Pa = 1N/1m² = 1N⁻²
Because 1 N = 1 Kgms⁻²

Why are the densities of gases lower than that of liquids?

Gases have lower densities than densities of liquids. It is due to the light mass and more volume occupied by the gases. Another reason for lower densities of gases s negligible intermolecular forces among the gases molecules.

What do you mean by evaporation how it is affected by surface area?

Affect of surface area on evaporation: Evaporation is a surface phenomenon. Greater is surface area, greater is evaporation ad vice versa.
Example: Sometimes, a saucer is used if tea is to be cooled quickly. This is the smaller surface area of a tea cup.

Define the term allotropy with examples?

Allotropy: The existence of an element in more than one forms in same physical state is called allotropy.
Example: Sulphur exists in two allotropic dorms at 96°C below this temperature rhombic form is stable. Above this temperature monoclinic form is stable.

In which form sulphur exists at 100°C?

Sulphur exists in monoclinic form at 100°C.

What is the relationship between evaporation and boiling point of a liquid?

Relationship between evaporation and boiling point: If the boiling point of a liquid is high, its evaporations slow. Because intermolecular forces are high in the liquid which have high boiling point. If boiling point is low then evaporation.

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