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State two factors upon which the rate of emission of thermions depends.
State the effect of an increase of impurities on the melting point of ice.
1 g ice of 0℃ melts to form 1 g water at 0℃. State whether the latent heat is absorbed or given out by ice.
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.
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)
Water expands on reducing its temperature below ______°C.
What do you mean by the statement?
'The specific latent heat capacity of fusion of ice is 336 J per g'?
Define the following terms:
(i) Specific latent heat,
(ii) Specific latent heat of fusion.
What is the name given to the energy absorbed during a phase change?
Explain the statement; “The specific latent heat of vaporization of wafer is 2260 × 103 J/kg”.
What do you understand by the ‘latent heat of vaporization’ of a substance?
If pressure increases, the melting point of a substance ______.
Write the name.
Products obtained when sugar is heated.
1 kg of dry air at a temperature of 40 °C can hold a maximum of 49 g of water vapour.
Define specific latent heat capacity
Who introduced the term latent heat?
Give some practical applications of specific latent heat of ice.
The diagram below shows a cooling curve for a substance:
- State the temperatures at which the substance condenses.
- The temperature range in which the substance is in liquid state.
- Why do we prefer ice to ice-cold water for cooling a drink?
