Advertisements
Advertisements
Question
Study the following procedure and answer the questions below:
1. Take 3 spheres of iron, copper and lead of equal mass.
2. Put all the 3 spheres in boiling water in a beaker for some time.
3. Take 3 spheres out of the water. Put them immediately on a thick slab of wax.
4. Note, the depth that each sphere goes into the wax.
i) Which property of substance can be studied with this procedure?
ii) Describe that property in minimum words.
iii) Explain the rule of heat exchange with this property.
Advertisements
Solution
i. Specific heat
ii. Specific heat : The amount of heat energy required to raise the temperature of a unit mass of an object by 1oC .
iii. According to the principle of hear exchange :
Heat energy lost by the hot object = Heat energy gained by the cold
object
In this activity heat absorbed by iron sphere is transmitted more in the wax, hence sphere goes deepest in to wax, while lead sphere absorbs less heat, resulting in less transmission of heat in the wax hence sphere goes the least depth in the wax.
APPEARS IN
RELATED QUESTIONS
A child running a temperature of 101°F is given an antipyrin (i.e. a medicine that lowers fever) which causes an increase in the rate of evaporation of sweat from his body. If the fever is brought down to 98 °F in 20 min, what is the average rate of extra evaporation caused, by the drug? Assume the evaporation mechanism to be the only way by which heat is lost. The mass of the child is 30 kg. The specific heat of human body is approximately the same as that of water, and latent heat of evaporation of water at that temperature is about 580 cal g–1.
A copper vessel of mass 100 g contains 150 g of water at 50°C. How much ice is needed to cool it to 5°C?
Given: Specific heat capacity of copper = 0.4 Jg-1 °C-1
The Specific heat capacity of water = 4.2 Jg-1 °C-1
The Specific latent heat of fusion ice = 336 Jg-1
Water in lakes and ponds do not freeze at once in cold countries. Give a reason is support of your answer.
Write the approximate value of specific heat capacity of water in S.I. unit.
What do you mean by the following statement?
The specific heat capacity of copper is 0. 4 Jg-1 K-1?
Give one example where high specific heat capacity of water is used as cooling purposes?
In an experiment to determine the specific heat capacity of a solid following operations were
made:
Mass of calorimeter + stirrer = x kg
Mass of water = y kg
Initial temperature of water t1℃
Mass of solid = z kg
Temperature of solid = t2 ℃
Temperature of mixture = t ℃
Specific heat capacity of calorimeter and water are c1 and c2 respectively. Express the specific
heat capacity c of the solid in terms of the above data.
Give one example where high specific heat capacity of water is used as cooling.
Explain, why water is considered as best liquid for quenching thirst?
If, in a central heating system, steam enters a radiation pipe at 100°C and water leaves the radiation pipe at 100°C, can this radiation pipe heat a room? Give an explanation for your answer.
An electric immersion heater is rated 1250 W. Calculate the time in which it will heat 20 kg of water at 5°C to 65°C.
State factors on which the amount of heat radiated by a body depends.
_______ is defined as the amount of heat required to raise the temperature of 1kg of a substance by 1°C.
What is specific heat capacity?
When a uniform rod is heated, which of the following quantity of the rod will increase
If 'Cp' and 'Cv' are molar specific heats of an ideal gas at constant pressure and volume respectively. If 'λ' is the ratio of two specific heats and 'R' is universal gas constant then 'Cp' is equal to ______.
Specific heat capacity of a substance X is 1900 Jkg-1°C-1 means ______.
Two blocks P and Q of different metals having their mass in the ratio 2 : 1 are given same amount of heat. Their temperature rises by same amount. Compare their specific heat capacities.
