1) A blacksmith heats a 2.5kg piece of steel of 850 degrees Celisus, then allows it to cool to room temperature (20oC). How much heat is released as it cools? (The specific heat of steel is 466 J/kg.0C)
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.
1) A blacksmith heats a 2.5kg piece of steel of 850 degrees Celisus, then allows it to cool to room temperature (20oC). How much heat is released as it cools? (The specific heat of steel is 466 J/kg.0C)
2) A small brass ring has a mass of 0.02 kg. A scientist measures that 342 J of heat are required to increase it temperature by 45oC. Based on this information, what is the specific heat of brass?
Questions 5-7, the following values will be needed:
Specific heat of liquid water: 4,186 J/kg.0C
Heat of vaporization of water: 226,000 J/kg
Boiling point of water: 1000C
A tea kettle holds 0.6kg of water at 250C. It is placed on a stove until the water has entirely boiled and tuned to steam
5. How much heat is required to raise the temperature of water to its boiling point
6. How much heat is required to fully vaporize the water?
7. What is the total energy absorbed by the water during this process?
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