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प्रश्न
State the principle of calorimeter and define calorie and kilocalorie.
उत्तर
Principle of Calorimeter:
When a hot body is mixed or kept in contact with a oold body, there is a transfer of heat from hot body to oold body such that
Total heat gained by oolder body= Total heat lost by the hot body,
if there is no loss of heat to the surroundings.
One calorie is the quantity of heat required tD raise the temperature of 1 g of water by 1°C.
1 calorie= 4.186 joule
One kilocalorie is the quantity of heat required to raise the temperature of 1 kg of water by 1°C.
1 kcal= 4.186 x 103 joule
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संबंधित प्रश्न
What is a calorimeter?
1.0 kg of water is contained in a 1.25 kW kettle. Calculate the time taken for the temperature of water to rise from 25° C to its boiling point of 100°C. Specific heat capacity of water = 4.2 J g-1K-1.
Explain the melting point ?
The amount of heat energy required to convert 1 kg of ice at – 10℃ to water at 100℃ is 7,77,000 J. Calculate the specific latent heat of ice. Specific heat capacity of ice = 2100 J kg-1K-1, Specific heat capacity of water = 4200 J kg-1 K-1.
Give scientific reasons for the following:
It is much easier to skate on rough ice than on glass.
Fill in the following blank using suitable word:
Two bodies in contact are said to be in thermal equilibrium, if they have same ...........
Fill in the following blank using suitable word:
The normal temperature of a human body is .............
Which has more heat: 1 g of ice at 0°C or 1 g of water at 0°C? Give reason.
A copper calorimeter of mass 50g contains 100g of water at 20°C. A metallic piece of mass 250 g is heated to 100°C and is then dropped into the calorimeter. The contents of the calorimeter are well stirred and its final highest temperature is recorded to be 28 °C. If the specific heat capacity of water is 4.2 J/g°C and of copper is 0.4 J/g°C, find:
(i) the heat gained by water,
(ii) the heat gained by calorimeter,
(iii) total heat supplied by the metal piece, and
(iv) the specific heat capacity of metal.
