1.900 × 106 J of heat is added to a cylinder of aluminum (radius 5.000 cm, length 10.00 cm) at room temperature (let’s call the temperature exactly 300 K). Is this amount of heat enough to completely melt the aluminum? Assume the specific heat quoted in the text applies to aluminum in any phase and also that the density is valid at 300 K. 1) Calculate what amount of heat is necessary to take this aluminum to the closest phase boundary. 2) Calculate what amount of heat is necessary to take this aluminum across the phase boundary. 3) In light of the previous two answers, has enough heat been added to take the aluminum across the phase boundary? To answer this question, calculate and report what amount of heat would be needed to turn the sample into liquid at the melting point (analogous to turning ice into liquid water at 0°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.
1.900 × 106 J of heat is added to a cylinder of aluminum (radius 5.000 cm, length
10.00 cm) at room temperature (let’s call the temperature exactly 300 K). Is this
amount of heat enough to completely melt the aluminum? Assume the specific
heat quoted in the text applies to aluminum in any phase and also that the
density is valid at 300 K.
1) Calculate what amount of heat is necessary to take this aluminum to the
closest phase boundary.
2) Calculate what amount of heat is necessary to take this aluminum across the
phase boundary.
3) In light of the previous two answers, has enough heat been added to take the
aluminum across the phase boundary? To answer this question, calculate and
report what amount of heat would be needed to turn the sample into liquid at
the melting point (analogous to turning ice into liquid water at 0°C).
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