i) Water in lakes and ponds do not freeze at once in cold countries. Give a reason in support for your answer.

ii) What is the principle of calorimetry?

iii) Name the law on which the principle is based.
iv) State the effect of an increase of impurities on the melting point of ice.

Solution

i) The specific latent heat of fusion of ice is sufficiently high (336 J g^-1) so as to freeze water, a large quantity of heat has to be withdrawn, hence it freezes slowly.

ii) Heat energy lost by the hot body is equal to the heat energy gained by the cold body. This is called the principle of calorimetry. For this, hot and the cold body should be kept in close contact and there is no exchange of heat from the surroundings.

iii) Law of conservation of energy.

iv) The melting of ice decreases by increasing of impurities in it.

Some More Questions From Calorimetry Chapter

Define the term ‘Heat Capacity’ and state its S.I. unit.

What is meant by Global warming?

i) It is observed that the temperature of the surroundings starts falling when the ice in a frozen lake starts melting. Give a reason for the observation.
ii) How is the heat capacity of the body related to its specific heat capacity?

Specific Heat Capacity of substance A is 3.8 J g^-1 K^-1 whereas the specific heat capacity of substance B is 0.4 J g^-1 K T^-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?

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Calorimetry

i) Water in lakes and ponds do not freeze at once in cold countries. Give a reason in support for your answer.

ii) What is the principle of calorimetry?

iii) Name the law on which the principle is based.
iv) State the effect of an increase of impurities on the melting point of ice.

Some More Questions From Calorimetry Chapter

Define the term ‘Heat Capacity’ and state its S.I. unit.

What is meant by Global warming?

i) It is observed that the temperature of the surroundings starts falling when the ice in a frozen lake starts melting. Give a reason for the observation.
ii) How is the heat capacity of the body related to its specific heat capacity?

i) State any two measures to minimize the impact of global warming.
ii) What is the Greenhouse effect?

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For Daily Free Study Material Join wiredfaculty

Calorimetry

i) Water in lakes and ponds do not freeze at once in cold countries. Give a reason in support for your answer. ii) What is the principle of calorimetry? iii) Name the law on which the principle is based. iv) State the effect of an increase of impurities on the melting point of ice.

Some More Questions From Calorimetry Chapter

Define the term ‘Heat Capacity’ and state its S.I. unit.

What is meant by Global warming?

i) It is observed that the temperature of the surroundings starts falling when the ice in a frozen lake starts melting. Give a reason for the observation. ii) How is the heat capacity of the body related to its specific heat capacity?

i) State any two measures to minimize the impact of global warming. ii) What is the Greenhouse effect?

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

i) Water in lakes and ponds do not freeze at once in cold countries. Give a reason in support for your answer.

ii) What is the principle of calorimetry?

iii) Name the law on which the principle is based.
iv) State the effect of an increase of impurities on the melting point of ice.

i) It is observed that the temperature of the surroundings starts falling when the ice in a frozen lake starts melting. Give a reason for the observation.
ii) How is the heat capacity of the body related to its specific heat capacity?

i) State any two measures to minimize the impact of global warming.
ii) What is the Greenhouse effect?