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Question
How will you prove experimentally that different substances have different specific heat capacities?
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Solution
Experiment to prove different substances have different specific heat capacities:
- Take three balls of iron, copper, and lead of equal mass and put them in boiling water for some time. Then, take them out of the water and measure their temperature.
- All of them will be at temperature 100oC. Now, put them immediately on the thick slab of wax. Note the depth that each of the balls goes into the wax. The ball which absorbs more heat from the water will give more heat to wax. More wax will thus melt and the ball will go deeper into the wax. It will be observed that the iron ball goes deepest into the wax. The lead ball goes the least and the copper ball goes to intermediate depth. This shows that for the equal rise in temperature, the three balls have absorbed different amounts of heat.
- This means that the property which determines the amount of heat absorbed by a ball is different for the three balls. This property is called the specific heat capacity.
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What is meant by specific heat capacity?
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.
The farmers fill their fields with water in winter. Give reason.
Is it possible to condense the water formed, back to ice by adding ice at 0°C. Explain with reason.
63.2 g of copper at 50°C can just melt 3.8g of ice. If the specific latent heat of ice is 336 J/g, find the specific heat capacity of copper.
The SI unit of specific heat is _______.
The heat capacity of the vessel of mass 100 kg is 8000 J/°K. Find its specific heat capacity.
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 ______.
On supplying 100 µC of charge to a conductor, its potential rises by 5 V then capacity of the conductor is ______.
The specific heat capacity of ______ is maximum.
The molar specific heats of an ideal gas at constant pressure and volume are denoted by Cp and Cv, respectively. If `gamma = "C"_"p"/"C"_"v"` and R is the universal gas constant, then Cv is equal to ______.
