Question

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Answer 1

Explanation:

1. (a)(300-273)=27∘C (b)(573-273)=300∘C.

2.liquid state at 25 c and gaseous at 100 c

3.The temperature remains constant during the change of state because the heat energy which is supplied to change the state of matter is used in breaking the intermolecular forces and other attractive forces. Hence the temperature remains constant as all the heat is used up and no external heat is released or absorbed

4.The gases can be converted into liquids by bringing its particles closer so atmospheric gases can be liquefied either by decreasing temperature or by increasing pressure

Answer 2

Explanation:

Remember the relationship:Temperature in Kelvin = Temperature in °C + 273

Substitute the given value in the equation and then calculate the other unknown value.

a. 293 K = (293 – 273)

= 20 °C

b. 470 K = (470 – 273)

= 197 °C

(a) 25 º C

 Water at 25°C is present in the liquid state.

The water which we use for our day to day activities is in the liquid state.

The water which we use for drinking, cooking, washing, etc all are in a liquid state.

(b) 0ºC

 At 0°C,  water exists in solid-state.

We know that the freezing point of water is 0 °C.

The liquid form of water starts to become solid (ice) at this temperature.

Example: If you keep an ice cube tray filled with water and freeze it for a few hours, you may observe the cubes where you poured water have become solid. Ice is the solid-state of water.

(c) At 100ºC

 At 100°C, water exists in a gaseous state.

We know that the boiling point of water is 100°C.

The water starts to evaporate after attaining this high temperature.

Example: When you boil water in your home, after some time you observe the vapours coming out of the vessel. These vapours are the gaseous state of water.

The temperature remains constant during the change of state because the heat energy which is supplied to change the state of matter is used in breaking the intermolecular forces and other attractive forces. Hence the temperature remains constant as all the heat is used up and no external heat is released or absorbed.

The gases can be converted into liquids by bringing its particles closer so atmospheric gases can be liquefied either by decreasing temperature or by increasing pressure