In a popular lecture demonstration, a sheetof paper is wrapped around a rod that is made from wood on onehalf and metal on the other half. If held over a flame, the paper onone half of the rod is burned while the paper on the other half isunaffected. (a) Is the burned paper on the wooden half of the rod,or on the metal half of the rod? (b) Choose the best explanationfrom among the following:I. The metal will be hotter to the touch than the wood; therefore the metal side will be burnt.II. The metal conducts heat better than the wood, and hence thepaper on the metal half is unaffected.III. The metal has the smaller specific heat; hence it heats upmore and burns the paper on its half of the rod
Energy transfer
The flow of energy from one region to another region is referred to as energy transfer. Since energy is quantitative; it must be transferred to a body or a material to work or to heat the system.
Molar Specific Heat
Heat capacity is the amount of heat energy absorbed or released by a chemical substance per the change in temperature of that substance. The change in heat is also called enthalpy. The SI unit of heat capacity is Joules per Kelvin, which is (J K-1)
Thermal Properties of Matter
Thermal energy is described as one of the form of heat energy which flows from one body of higher temperature to the other with the lower temperature when these two bodies are placed in contact to each other. Heat is described as the form of energy which is transferred between the two systems or in between the systems and their surrounding by the virtue of difference in temperature. Calorimetry is that branch of science which helps in measuring the changes which are taking place in the heat energy of a given body.
In a popular lecture demonstration, a sheet
of paper is wrapped around a rod that is made from wood on one
half and metal on the other half. If held over a flame, the paper on
one half of the rod is burned while the paper on the other half is
unaffected. (a) Is the burned paper on the wooden half of the rod,
or on the metal half of the rod? (b) Choose the best explanation
from among the following:
I. The metal will be hotter to the touch than the wood; therefore the metal side will be burnt.
II. The metal
paper on the metal half is unaffected.
III. The metal has the smaller specific heat; hence it heats up
more and burns the paper on its half of the rod
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