# Principle of Calorimetry

## Trending Questions

**Q.**

1 kg of ice at 0∘C is mixed with 1 kg of steam at 100∘C. What will be the composition of the system when thermal equilibrium is reached? Latent heat of fusion of ice = 3.36 × 105 J kg−1 and latent heat of vaporization of water = 2.26 × 106 J kg−1

2kg steam

2 kg ice

665gm water, 1.335 kg steam

665 gm steam, 1.335 kg water

**Q.**Why different materials have different specific heat?

**Q.**

Relation between specific heat and degree of freedom.

**Q.**

On which law the principle of method of mixtures is based?

**Q.**

What is temperature? How it is measured?

**Q.**

The temperature of 600 g of cold water rises by 15∘C when 300 g of hot water at 50∘C is added to it. What was the initial temperature of the cold water?

**Q.**

Give one example each where high specific heat capacity of water is used (i) as coolant, (ii) as heat reservoir.

**Q.**

45 g of water at 50∘C in a beaker is cooled when 50 g of copper at 18∘C is added to it.The contents are stirred till a final constant temperature is reached.Calculate the final temperature.The specific heat capacity of copper is 0.39 Jg−1 K−1 and that of water is 4.2 Jg−1 K−1.State the assumption used.

**Q.**

What is the principle of method of mixture ? What other name is given to it ? Name the law on which this principle is based .

**Q.**

Why is the loss of heat due to radiation minimised in a calorimeter?

**Q.**

A 5 g piece of ice at −20∘C is put into 10 g of water at 30∘C. Assuming that heat is exchanged only between the ice and the water. Then find the heat required for phase change. Specific heat capacity of ice =2100 Jkg−1∘C−1. Specific heat capacity of water =4200 Jkg−1∘C−1 and latent heat of fusion of ice 3.36×105 J kg−1.

4680 J

1680 J

3680 J

2680 J

**Q.**

A hot solid of mass 60 g at 100∘C is placed in 150 g of water at 20∘C. The final temperature recorded is 25∘C. Calculate the specific heat of solid. (Specific heat of water = 4200J/kg/∘C)

50J/kg/

^{0}C100J/kg/

^{0}C300J/kg/

^{0}C700J/kg/

^{0}C

**Q.**

A 5g piece of ice at −20∘C is put into 10g of water at 30∘C. Assuming that heat is enchanged only between the ice and the water, find the final temperature of the mixture. Specific heat capacity of ice =2100Jkg−1∘C−1. Specific heat capacity of water =4200Jkg−1∘C−1 and latent heat of fusion of ice 3.36×105 J kg−1.

20∘ C

10∘ C

0∘ C

30∘ C

**Q.**

Why is a calorimeter box made up of Copper?

**Q.**

0.5 kg of lemon squash at 30∘C is placed in a refrigerator which can remove heat at an average rate of 30 J s−1.How long will it take to cool the lemon squash to 5∘C? Specific heat capacity of squash=4200 J kg−1 K−1.

**Q.**

A mass of 50 g of a certain metal at 150∘C is immersed in 100 g of water at 11∘C. The final temperature is 20∘C. Calculate the specific heat capacity of the metal. Assume that the specific heat capacity of water is 4.2 J g−1 K−1.

**Q.**

Name two factors on which the heat energy liberated by a body on cooling depends.

**Q.**

(a) What is calorimeter?

(b) Name the material of which it is made of. Give two reasons for using the material stated by you.

(c) Out of the three metals A, B and C of specific heat capacity 900 J kg−1 ∘C−1, 380Jkg−1 ∘C−1 and 460Jkg−1 ∘C−1 respectively, which will you prefer for calorimeter? Give reason.

(d) How is the loss of heat due to radiation minimized in a calorimeter?

**Q.**

What are the contributions of chemistry in the following field?

Cosmetics.

**Q.**

Heat energy lost by a hot body is equal to heat energy gained by the cold body. Which of the following option/options below is/are associated with the above statement?

Law of gravitation

Law of conservation of energy

m1c1ΔT1 = m2c2ΔT2

None of these

**Q.**

Name two factors on which the heat energy liberated by body depends?

**Q.**

In an experiment, 17 g of ice is used to bring down the temperature of 40 g of water at 34∘C to its freezing temperature. The specific heat capacity of water is 4.2 J g−1 K−1. Calculate the specific latent heat of ice. State one important assumption made in the above calculation.

**Q.**When a polar bear jumps onto an iceberg, its weight 200 kg.wt. is just sufficient to sink the iceberg. Then the weight of ice-berg is (specific gravity of ice = 0.9; Sp.gr. of sea water = 1.02)

**Q.**

A mass m1 of a substance of specific heat capacity c1 at temperature t1 is mixed with a mass m2 of other substance of specific heat capacity c2 at a lower temperature t2.Deduce the expression for the temperature t of the mixture.State the assumption made, if any.

**Q.**

A piece of ice of mass 40 g is added to 200 g of water at 50oC. Calculate the final temperature of water when all the ice has melted.Specific heat capacity of water=4200 J kg−1 K−1 and specific latent heat of fusion of ice =336 ×103 J kg−1.

**Q.**

___________ is used to measure the amount of heat gained or lost by a substance.

Calorimeter

Speedometer

Barometer

Odometer

**Q.**

A calorimeter is made of a thin sheet of copper so that

It can absorb a large amount of heat from the contents of the calorimeter

It can absorb less amount of heat from the surroundings

It can absorb a small amount of heat from the contents of the calorimeter

It can liberate a small amount of heat to the surroundings

**Q.**The temperature of equal masses of three different liquids A, B, C are 12∘C, 19∘C and 28∘C respectively. The temperature when A and B are mixed is 16∘C while when B and C are mixed, it is 23∘C. What would be the temperature when A and C are mixed assuming the same initial temperatures?

20.26∘C

10.26∘C

30.26∘C

40.26∘C

**Q.**

200 g of hot water at 80∘C is added to 300 g of cold water at 10∘C.Neglecting the heat taken by the container, calculate the final temperature of the mixture of water.Specific heat capacity of water =4200 J kg−1 K−1 .

**Q.**

A solid of mass 0.15 kg is heated from 10 °C to 90 °C. If the specific heat capacity of the solid is 390 J kg^{-1} °C^{-1}, find the heat absorbed by the solid.