a) Some water has frozen in a gutter. The gutter is a cylinder that has a 3 inch diameter and is 8 feet long. If this volume of ice starts to melt, how much heat energy, in Joules, does it take to raise the temperature of the ice from −7 ◦C to 0◦C? The density of ice is 916.9kg/m3 b) Now that the ice is at 0◦C, how much heat does it take to melt all of the ice into liquid water at 0◦C? Answer: 3.4 × 106J c) Finally, how much heat does it take to raise the temperature of the liquid water by 7 more degrees C? Assume the specific heat of water is 4186 J/kg◦C.
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.
a) Some water has frozen in a gutter. The gutter is a cylinder that has a 3 inch diameter and is 8 feet long. If this volume of ice starts to melt, how much heat energy, in Joules, does it take to raise the temperature of the ice from −7 ◦C to 0◦C? The density of ice is 916.9kg/m3
b) Now that the ice is at 0◦C, how much heat does it take to melt all of the ice into liquid water at 0◦C? Answer: 3.4 × 106J
c) Finally, how much heat does it take to raise the temperature of the liquid water by 7 more degrees C? Assume the specific heat of water is 4186 J/kg◦C.
- Diameter of the cylinder is d = 3 in = 0.0762 m.
So Radius of cylinder is r = 1.5 in = 0.038 m
- Height of cylinder is h = 8 ft = 2.438 m
- Density of ice is 916.9 kg/m3
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