Internal Energy; From Brightspace Flashcards
What does the first law of thermodynamics link?
It links heat and work to a new form of energy: the Internal Energy.
What are the two general ways a system may exchange energy with its surroundings?
As heat or as work.
What happens to the internal energy of a system when heat is added or work is done on it?
The internal energy increases.
What is the algebraic expression of the first law of thermodynamics?
∆ E = q + w
What does a positive value of q indicate?
Heat is transferred to the system from the surroundings.
What does a positive value of w indicate?
Work is done on the system by the surroundings.
What is a state function?
A property of a system determined by specifying the system’s condition, such as temperature and pressure.
Are q and w state functions?
No, q and w are not state functions.
What does heat capacity (C) represent?
The amount of heat required to raise the temperature of an object by 1 K (or 1 °C).
What is molar heat capacity (C_m)?
The heat capacity of one mole of a substance.
What is specific heat capacity (C_s)?
The heat capacity of one gram of a substance.
How can the specific heat (C_s) of a substance be determined?
By measuring the temperature change (∆ T) that a known mass (m) of the substance experiences.
