Advertisements
Advertisements
Question
If pressure increases, the melting point of a substance ______.
Options
does not change
decreases
increases
remains constant
Solution
If pressure increases, the melting point of a substance increases.
Explanation:
Most substances' melting points rise as pressure increases because the solid state is more compact than the liquid state. Higher pressure favors the solid phase, necessitating additional heat (higher temperature) to overcome this and cause melting. Ice is an exception to this rule, as its melting point decreases under pressure due to its unusual structure.
APPEARS IN
RELATED QUESTIONS
Write the approximate value of specific latent heat of ice.
Which has more heat: 1 g ice at 0℃ or 1g water 0℃? Give reason.
- Which requires more heat: 1 g ice at 0℃ or 1 g water at 0℃ to raise its temperature to 10℃?
- Explain your answer in part (a).
The S.I. unit of specific latent heat is ______.
A refrigerator converts 100g of water at 20℃ to ice at – 10℃ in 73.5 min. Calculate the average rate of heat extraction in watt. The specific heat capacity of water is 4.2 J kg-1 K-1, specific latent heat of ice is 336 J g-1 and the specific heat capacity of ice is 2.1 J kg-1 K-1.
Calculate the total amount of heat energy required to convert 100 g of ice at −10℃ completely into water at 100℃. Specific heat capacity of ice = 2.1 J g-1 K-1, specific heat capacity of water = 4.2 J g-1K-1, specific latent heat of ice = 336 J g-1.
During transformation of liquid phase to solid phase, the latent heat is ______.
A thermally insulated pot has 150 g ice at temperature 0°C. How much steam of 100°C has to be mixed to it, so that water of temperature 50°C will be obtained? (Given : latent heat of melting of ice = 80 cal/g, latent heat of vaporization of water = 540 cal/g, specific heat of water = 1 cal/g °C)
When a liquid is getting converted into solid, the latent heat is ………………………………
Define the following terms:
(i) Specific latent heat,
(ii) Specific latent heat of fusion.
When 1 g of ice at 0 °C melts to form 1 g of water at 0 °C then, is the latent heat absorbed by the ice or given out by it?
The specific latent heat of vaporisation of steam is 2260 J/g. Comment on this.
Why do we feel much comfortable when we sit under a moving fan especially when our body is sweating?
State the main precautions to be taken in finding the latent heat of steam.
1 kg of dry air at a temperature of 40 °C can hold a maximum of 49 g of water vapour.
Specific latent heat L = ______.
600 g of copper at 50°C is mixed with lOOOg water at 20°C. Find the final temperature of the mixture. The specific heat capacity of copper is 0.4 Jg-1°C-1 and that of water is 4.2 Jg-1°C-1
