Advertisements
Advertisements
Question
State the principle of calorimeter and define calorie and kilocalorie.
Solution
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
APPEARS IN
RELATED QUESTIONS
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.
(i) Name the physical quantity which is measured in calories.
(ii) How is calorie related to the S.I. unit of that quantity ?
The melting point of naphthalene is 80°C and the room temperature is 30°C. A sample of liquid naphthalene at 100°C is cooled down to the room temperature. Draw a temperature time graph to represent this cooling. In the graph, mark the region which corresponds to the freezing process.
In an experiment. 17 g of ice is used to bring down the temp. of 40 g of water from 34°C to its freezing point. The sp. heat capacity of water is 4.25 J/g°C. Calculate sp. latent heat of ice.
Fill in the following blank using suitable word:
Two bodies in contact are said to be in thermal equilibrium, if they have same ...........
What happens to the average kinetic energy of the molecules as ice melts at 0°C?
50 g of ice at 0°C is added to 300 g of a liquid at 30°C. What will be the final temperature of the mixture when all the ice has melted? The specific heat capacity of the liquid is 2.65 Jg-1 °C-1 while that of water is 4.2 J g-1 °C-1. Specific latent heat of fusion of ice = 336 Jg-1.
