Advertisements
Advertisements
प्रश्न
Write the name.
Products obtained when sugar is heated.
उत्तर
Products obtained when sugar is heated- Carbon and water vapour
APPEARS IN
संबंधित प्रश्न
State two characteristics of a good thermion emitter.
State any two measures to minimize the impact of global warming.
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.
Explain the following:
The heat supplied to a substance during it change of state, does not cause any rise in its temperature.
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.
What is meant by latent heat? How will the state of matter transform if latent heat is given off?
Answer the following:
Explain the role of latent heat in the change of state of a substance.
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?
What do you understand by the ‘latent heat of vaporization’ of a substance?
Derive an expression for the amount of heat given out or taken up, when its temperature falls or rises by t°C.
If there is no Heat loss to the surroundings, the heat released by the condensation of m1 g of steam at 100°C into water at 100°C can be used to convert m2 g of ice at 0°C into water at 0°C.
(i) Find:
(a) The heat lost by steam in terms of m1
(b) The heat gained by ice in terms of m2
(ii) Form a heat equation find the ratio of m2 : m1
Specific latent heat of vaporization of steam = 2268 kJ/kg
Specific latent heat of fusion of ice = 336 kJ/kg
Specific heat capacity of water = 4200 J/kg°C
When ice is converted into water : constant temperature : : before the water evaporates : _______
Specific latent heat of vaporisation : J/kg : : specific heat : _______
Define boiling point of a liquid.
Write scientific reason.
Even if boiling water is constantly heated, its temperature does not rise.
Write scientific reason.
The bottom of some steel utensils used for cooking is copper.
2875 J of heat is required to melt 115 g of lead at its melting point. Calculate the specific latent heat capacity of fusion of lead.
