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Question
Describe a method to determine the specific heat capacity of a solid (say, a piece of copper).
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Solution
First we weigh the given piece of solid and note its mass m1. Then it is heated by suspending it inside a heater. Then a known mass (say m2) of water is taken in a thin glass beaker and its temperature θ1 is recorded with a thermometer. When the given piece of solid becomes heated, its temperature θ2 is noted and it is quickly dropped into the water contained in the beaker, such that no water splashes out. The contents of beaker are well stirred and the final highest temperature θ3 is noted.
Assuming that the heat capacity of beaker is negligible and there is not heat loss to the surroundings,
Heat lost by the solid = Heat gained by water Mass of solid × Specific heat capacity of solid × Fall in temperature of solid = Mass of water × Sp. capacity of water × Rise in temperature of water.
or m1 × c × (θ2 - θ3) = m3 × 4.2 × (θ3 - θ1)
or c = `("m"_2 xx 4.2 xx (theta_3 - theta_1))/(theta_1 xx (theta_2 - theta_3))` J/g°C
Here we have assumed that specific heat capacity of water is 4.2 J/g°C.
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Write a short note.
Specific heat capacity
Read this activity and answer the following questions.
- Take three spheres of iron, copper and lead. the lead of equal mass.
- Put all the three spheres in boiling water in the beaker for some time.
- Take the three spheres out of the water.
- All the spheres will be at a temperature 100 °C.
- Put them immediately on the thick slab of wax.
- Note, the depth that each of the sphere goes into the wax.
Questions:
- Which property is determined from this activity?
- Give name to that property.
- Explain the term principal of heat exchange with the help of this activity.
Observe the following diagram and answer the questions given below:
Specific heat capacity of metals
- Which element has maximum specific heat capacity? Justify.
- Which element has minimum specific heat capacity? Justify.
- Define specific heat of object.
