Law of heat exchange is used to determine:
A. Coefficient of linear expansion
B. Coefficient of volume expansion
C. Ideal gas constant
D. Specific heat of substance
Right answer is D.
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Answers
Answer:
The heat capacity measures the amount of heat necessary to raise the temperature of an object or system by one degree Celsius.
LEARNING OBJECTIVES
Explain the enthalpy in a system with constant volume and pressure
KEY TAKEAWAYS
Key Points
Heat capacity is the measurable physical quantity that characterizes the amount of heat required to change a substance’s temperature by a given amount. It is measured in joules per Kelvin and given by.
The heat capacity is an extensive property, scaling with the size of the system.
The heat capacity of most systems is not constant (though it can often be treated as such). It depends on the temperature, pressure, and volume of the system under consideration.
Key Terms
heat capacity: The amount of heat energy needed to raise the temperature of an object or unit of matter by one degree Celsius; in units of joules per kelvin (J/K).
enthalpy: the total amount of energy in a system, including both the internal energy and the energy needed to displace its environment
Heat Capacity
Heat capacity (usually denoted by a capital C, often with subscripts), or thermal capacity, is the measurable physical quantity that characterizes the amount of heat required to change a substance’s temperature by a given amount. In SI units, heat capacity is expressed in units of joules per kelvin (J/K).
An object’s heat capacity (symbol C) is defined as the ratio of the amount of heat energy transferred to an object to the resulting increase in temperature of the object.
C
=
Q
Δ
T
.
Heat capacity is an extensive property, so it scales with the size of the system. A sample containing twice the amount of substance as another sample requires the transfer of twice as much heat (Q) to achieve the same change in temperature (ΔT). For example, if it takes 1,000 J to heat a block of iron, it would take 2,000 J to heat a second block of iron with twice the mass as the first.
Answer:
D. Specific heat of substance