Question

TTER IN OUR SURROUNDINGS
27. Why does the temperature remain constant during the melting of ice
continuously ?
28. Why does the temperature remain constant during the boiling of wate
continuously ?
29. Explain why, ice at 0°C is more effective in cooling than water at the sam
30. Would you cool a bucket of water more quickly by placing it on ice or by
your answer.
1. Why does steam cause more severe burns than boiling water ?
2. Which contains more heat, 1 kg of ice at 0°C or 1 kg of water at 0°C ?
3. Which contains more heat, 1 kg of water at 100°C or 1 kg of steam at
1. Explain why, steam at 100°C is better for heating purposes than boil
. Which produces more severe burns : boiling water or steam? Why
- Why does the temperature of a substance remain constant during
What is the physical state of water :
(a) at 0°C ? (b) at 25°C ? (c) at 100°C ? (d) at 250°C ?
Explain why, there is no rise in temperature of a substance when
iously.​

Answer 1

Answer:

27)The extra heat supplied is used in the melting of ice which is called the latent heat of fusion. Similarly, when a liquid starts boiling the temperature of the liquid does not change instead of a continuous supply of heat. That's why the temperature of a substance remains constant during its melting or boiling.

28) The temperature remains constant during the melting of ice even though heat is supplied continuously because the temperature is supplied for changing the state of matter not for increasing the temperature.

29) Ice at 273K is more effective in cooling than water at the same temperature as cie takes latent heat from the substances for melting and hence cools the substances more effectively than water at the same temperature.

30) We would place ice in the water to cool it more quickly because the ice takes its latent heat from the water and hence cools it more effectively.

1. Steam has more energy than boiling water. It possesses the additional latent heat of vaporization. Steam has more energy than boiling water. Therefore, burns produced by steam are more severe than those produced by boiling water.

2. 1 kg of water at 0°C has 3.34 × 105 J more energy than 1 kg of ice at the same temperature. Water converts into ice when heat is removed, and thus, 1kg of water contains more heat than 1kg of ice at the same temperature.

3.Latent heat of vaporization of water is 22.5 × 105 J/kg. ... It means that 1 kg of steam at 100°C has 22.5 × 105 J more energy than 1 kg of water at the same temperature.

4. Steam at 100°C has more heat than water at the same temperature. Water gets converted into steam on gaining heat. Due to this latent heat of vaporization, steam at 100°C is better for heating than boiling water at 100°C.

5. Steam has more energy than boiling water. It possesses the additional latent heat of vaporization. Therefore, burns produced by steam are more severe than those produced by boiling water.

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

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

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

At 250°C, water exists in a gaseous state.

7. There is no rise in the temperature of a substance when it undergoes a change of state though heat is being supplied because heat is used to overcome inter-molecular force of attraction between the particles of the substance during a change in physical state.

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