# Shared Flashcard Set

## Details

Physics Ch. 3 - Thermodynamics
MCAT
13
Physics
04/17/2016

Term
 What is an isolated system? How does it affect the change in internal energy?
Definition
 A system that can't exchange energy or matter with its surroundings. Results in the total change in internal energy being zero.
Term
 What is a closed system?
Definition
 A system that is capable of exchanging energy but not matter with the surroundings.
Term
 What is an open system?
Definition
 A system that can exchange both matter and energy.
Term
 What equation represents the first law of thermodynamics and determines a system's internal energy?
Definition
 ΔU = Q - W ΔU is the change in internal energy. Q is heat flowing in (+ value) or out (- value) of the system. W is the work done by (expansion, + value) or on (compression, - value) the system.
Term
 What is heat?
Definition
 The process by which a quantity of energy is transferred between two objects as a result of a difference in temperature. Measured in Joules (J)
Term
 What are the 3 forms of heat transfer?
Definition
 Conduction - direct transfer of energy through contact Convection - physical motion of a fluid over a material Radiation - energy transfer by electromagnetic waves
Term
 What equation relates the heat gained or lost by an object due to a change in temperature?
Definition
 q = mcΔT q is heat in Joules (J) m is mass c is specific heat in J/(g*K) T is change in temperature
Term
 What equation calculates heat energy added or removed from a system undergoing a phase change?
Definition
 q = mL q is heat energy in Joules (J) m is mass L is latent heat in J/kg
Term
 isothermal
Definition
 constant temperature therefore no change in internal energy Q = W
Term
Definition
 no heat exchange so change in internal energy equals the work done on or by the system ΔU = -W
Term
 isovolumetric or isochoric
Definition
 no change in volume therefore no work is accomplished ΔU = Q
Term
 isobaric
Definition
 occur at constant pressure, doesn't affect 1st law of thermodynamics
Term
 Equation for calculating the change in entropy
Definition
 ΔS = Qrev/T ΔS is the change in entropy in J/(mol*K) Q is the heat gained or lost in a reversible process in Joules (J) T is temperatuer in Kelvin (K)
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