Question

★★ Chemistry class 11th
Questions ★★


1. Wʜᴀᴛ ɪs ᴄʀɪᴛɪᴄᴀʟ Tᴇᴍᴘᴇʀᴀᴛᴜʀᴇ ?
2. Dᴇʀɪᴠᴇ ᴛʜᴇ ʟᴀᴡ ᴏғ ᴠɪsᴄᴏsɪᴛʏ
3. Exᴘʟᴀɪɴ Sᴜʀғᴀᴄᴇ Tᴇɴsɪᴏɴ .
4. Dᴇғɪɴᴇ.
(¡) Nᴏʀᴍᴀʟ ʙᴏɪʟɪɴɢ ᴘᴏɪɴᴛ
(¡¡) Sᴛᴀɴᴅᴀʀᴅ ʙᴏɪʟɪɴɢ ᴘᴏɪɴᴛ
5. Wʜᴀᴛ ɪs Vᴀᴘᴏᴜʀ ᴘʀᴇssᴜʀᴇ . Hᴏᴡ ɪs ᴛʜᴇ sᴀᴛᴜʀᴀᴛᴇᴅ ᴠᴀᴘᴏᴜʀ ᴘʀᴇssᴜʀᴇ. ?
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Answer 1

Answer:

Chemistry is the scientific discipline involved with elements and compounds composed of atoms, molecules and ions: their composition, structure, properties, behavior and the changes they undergo during a reaction with other substances

Answer 2

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1. IN SIMPLE LANGUAGE :

The temperature of a gas in its critical state, above which it cannot be liquefied by pressure alone.

IN SCIENTIFIC LANGUAGE :

Critical temperatures (the maximum temperature at which a gas can be liquefied by pressure) range from 5.2 K, for helium, totemperatures too high to measure. Critical pressures (the vapour pressure at the critical temperature) are generally about 40–100 bars.

2. The more usual form of this relationship, called Newton's equation , states that the resulting shear of a fluid is directly proportional to the force applied and inversely proportional to its viscosity. The similarity to Newton's second law of motion (F = ma) should be apparent.

3. Surface tension is the tendency of liquid surfaces to shrink into the minimum surface area possible. Surface tension allows insects, usually denser than water, to float and slide on a water surface.

IN EASY LANGUAGE :

Surface tension is an effect where the surfaceof a liquid is strong.This property is caused by the molecules in the liquid being attracted to each other (cohesion), and is responsible for many of the behaviors of liquids. Surface tension has the dimension of force per unit length, or of energy per unit area.

4. (i) IN SIMPLE LANGUAGE :

The normal boiling point of a liquid is the temperature at which one atmosphere (760 torr) is equal to its vapor pressure.

IN SCIENTIFIC LANGUAGE :

The boiling point of a substance is the temperature at which the vapor pressure of a liquid equals the pressure surrounding the liquid and the liquid changes into a vapor. The boiling point of a liquid varies depending upon the surrounding environmental pressure. 

(ii) IN SIMPLE LANGUAGE :

The standard boiling point is definedas the temperature at which boilingoccurs under a pressure of 1 bar. Thestandard boiling point is defined as the temperature at which boilingoccurs under a pressure of 1 bar.

IN SCIENTIFIC LANGUAGE :

The boiling point of a liquid varies according to the applied pressure; the normal boiling pointis the temperature at which the vapour pressure is equal to the standard sea-level atmospheric pressure (760 mm [29.92 inches] of mercury). At sea level, water boils at 100° C (212° F).

5. (a) IN EASY LANGUAGE :

Vapour pressure of a liquid at any temperature may be defined as the pressure exerted by thevapour present above the liquid in equilibrium with the liquid at that temperature.

IN SCIENTIFIC LANGUAGE :

Vapour pressure is a measure of the tendency of a material to change into the gaseous or vapour state, and it increases with temperature. The temperature at which the vapour pressure at the surface of a liquid becomes equal to the pressure exerted by the surroundings is called the boiling point of the liquid.

(b) The process of evaporation in a closed container will proceed until there are as many molecules returning to the liquid as there are escaping. At this point the vapor is said to be saturated, and the pressure of that vapor (usually expressed in mmHg) is called thesaturated vapour pressure.