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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?
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?
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?
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?
Which of the following is true about the behavior of foods during freezing?
What is the total amount of heat removed to freeze 200kg of apples from 25°C to -20°C?
What is the total amount of heat removed to freeze 200kg of apples from 25°C to -20°C?
What is the change in enthalpy (ΔH) for a process taking place at constant pressure when heat is absorbed?
What is the change in enthalpy (ΔH) for a process taking place at constant pressure when heat is absorbed?
What is the change in enthalpy (ΔH) for the reverse process of vaporization?
What is the change in enthalpy (ΔH) for the reverse process of vaporization?
Which equation represents the rate of heat loss from the sample in the method of cooling?
Which equation represents the rate of heat loss from the sample in the method of cooling?
What is the purpose of insulating the calorimeter in the method of mixtures?
What is the purpose of insulating the calorimeter in the method of mixtures?
What is the relationship between the cooling rate and the specific heat in the method of cooling?
What is the relationship between the cooling rate and the specific heat in the method of cooling?
What is the purpose of using an electrical element in the calorimeter in the electrical methods?
What is the purpose of using an electrical element in the calorimeter in the electrical methods?
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