ICSE Class 10th Science Chapter 11 - Calorimetry Important Questions with Answers

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The amount of heat energy required to melt a given mass of a substance at its melting point without any rise in its temperature is called as the ______.

specific heat capacity

specific latent heat of fusion

latent heat of fusion

specific latent heat of freezing

Question 2.

A solid of mass 60 g at 100°C is placed in 150 g of water at 20°C. The final steady temperature is 25°C. Calculate the heat capacity of solid.

[sp. heat capacity of water = 4.2 J g^-1 K^-1]

Question 3.

What mass of ice at 0°C added to 2.1 kg water, will cool it down from 75°C to 25°C? Given Specific heat capacity of water = 4.2 Jg^-1°C^-1, Specific latent heat of ice = 336 Jg^-1.

Question 4.

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?

Question 5.

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?

Question 6.

50 g of metal piece at 27°C requires 2400 J of heat energy so as to attain a temperature of 327°C . Calculate the specific heat capacity of the metal.

Question 7.

Heat energy is supplied at a constant rate to 100g of ice at 0 °C. The ice is converted into water at 0° C in 2 minutes. How much time will be required to raise the temperature of water from 0 °C to 20 °C? [Given: sp. heat capacity of water = 4.2 J g^-1 °C^-1, sp. latent heat of ice = 336 J g^-1].

Question 8.

Specific heat capacity of substance A is 3.8 J g^-1K^-1 whereas the specific heat capacity of substance B is 0.4 J g^-1 K^-1
(i) Which of the two is a good conductor of heat?
(ii) How is one led to the above conclusion?
(iii) If substances A and B are liquids then which one would be more useful in car radiators?

Question 9.

State any two measures to minimize the impact of global warming.

Question 10.

What is the Greenhouse effect?

Question 1.

A liquid X has the maximum specific heat capacity and is used as a coolant in Car Radiators. Name the liquid X.

Question 2.

A solid metal weighing 150 g melts at its melting point of 800 °C by providing heat at the rate of 100 W. The time taken for it to completely melt at the same temperature is 4 min. What is the specific latent heat of fusion of the metal?

Question 3.

Heat supplied to a solid change it into liquid. What is this change in the phase called?

Question 4.

During the phase change does the average kinetic energy of the molecules of the substance increase?

Question 5.

What is the energy absorbed during the phase change called?

Question 6.

State two differences between "Heat Capacity" and "Specific Heat Capacity".

Question 7.

Give a mathematical relation between Heat Capacity and Specific Heat Capacity.

Question 8.

The temperature of 170 g of water at 50°C is lowered to 5°C by adding a certain amount of ice to it. Find the mass of ice added.

Given: Specific heat capacity of water = 4200 J kg^-1 °C^-1 and specific latent heat of ice = 336000 J kg^-1.

Question 9.

Which has more heat: 1 g ice at 0? or 1g water 0?? Give reason.

Question 10.

(i) State whether the specific heat capacity of a substance remains the same when its state changes from solid to liquid.
(ii) Give one example to support your answer.