2) A hot bar of lead with Ti Pb, Mpb = .6 kg, is dropped into an iron pot (mFe = .3 kg) that has mH20 = 1 kg of water in it. The initial temperature of the water and iron is T₁ = 20 °C. At equilibrium, the final temperature Tr =25 °C for each item. a) Write the expression for the heat LOST by the lead bar. This will be in terms of Ti Pb. Specific heat: CPb = 130 J/(kg °C). Write this as -(expression). Qlost = b) Calculate the heat gained by the water. Specific heat: CH20 = 4186 J/(kg °C). Get a number for this. QH2O = c) Calculate the heat gained by the iron. Specific heat: CFe = 450 J/(kg °C). Get a number for this. QFe = d) Set the expression for heat lost equal to the total heat gained, then solve for Ti pb. Ti Pb = °℃ e) The initial length of the hot lead bar is L₁ = .25 m. By how much does the length change when it reaches equilibrium? Coefficient of thermal expansion for lead a = 2.9 x 10-5 1/°C. Be careful with signs. AT = °C AL = m
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.
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