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Mastering Specific Heat and Thermodynamics

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Mastering Specific Heat and Thermodynamics

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Questions and Answers

Which one of these is the correct equation to calculate the amount of energy required to raise the temperature of a substance in a batch heating or cooling process?

$Q/t = MC\Delta T$

$Q/t = mass flow rate \times specific heat \times temp change$

$Q = mass \times average specific heat \times temp change$

$Q = MC\Delta T$ (correct)

Which one of these is the correct definition of specific heat at constant pressure?

The amount of heat required to raise unit mass by unit temperature rise under constant pressure

The amount of heat required to raise unit mass by unit temperature rise under constant volume

The amount of heat required to raise unit mass by unit temperature rise at constant pressure (correct)

The amount of heat required to raise unit mass by unit temperature rise at constant volume

Which one of these is the correct equation to calculate specific heat based on the composition of a substance?

$Cv = \sum(X_i \cdot Cv_i)$

$Cp = \sum(X_i \cdot Cp_i)$ (correct)

$Cp = \sum(X_i \cdot Cv_i)$

$Cv = \sum(X_i \cdot Cp_i)$

Which of the following is true about the behavior of foods during freezing?

The effective freezing time is defined as the time required to reduce the temperature at the fastest cooling point from the ambient temperature to -15°C. (B) Signup and view all the answers

What is the total amount of heat removed to freeze 200kg of apples from 25°C to -20°C?

82,112 kJ (A) Signup and view all the answers

What is the change in enthalpy (ΔH) for a process taking place at constant pressure when heat is absorbed?

ΔH is positive (B) Signup and view all the answers

What is the change in enthalpy (ΔH) for the reverse process of vaporization?

ΔH is negative (D) Signup and view all the answers

Which equation represents the rate of heat loss from the sample in the method of cooling?

$m_1c_1\frac{dT}{dt} + mc_cc = m_2c_2\frac{dT}{dt} + mc_cc$ (C) Signup and view all the answers

What is the purpose of insulating the calorimeter in the method of mixtures?

To minimize heat loss to the surroundings (D) Signup and view all the answers

What is the relationship between the cooling rate and the specific heat in the method of cooling?

The cooling rate is inversely proportional to the specific heat (A) Signup and view all the answers

What is the purpose of using an electrical element in the calorimeter in the electrical methods?

To eliminate heat loss from the calorimeter (A) Signup and view all the answers