Thermodynamics Flashcards
What is heat?
Energy transferred as a result of temperature difference
What is work?
W = F x d
System?
Part of the universe that is of interest
Surroundings?
Rest of the universe
Isolated system?
No exchange of energy or matter with the surroundings
Closed system?
Contains a fixed amount of matter but allows exchange of energy
Open system?
Both matter and energy can be exchanged with the surroundings
Heat capacity?
Heat needed to raise the temperature of a substance by 1K units of JK-1
Specific heat capacity?
Heat needed to raise the temperature of 1g of a substance by 1K units of JK-1g-1
Molar heat capacity?
Heat needed to raise the temperature of 1 mole of a substance by 1K units of JK-1mol-1
Molar heat capacity at constant pressure Cp?
Heat needed to raise the temperature of 1 mol of a gas by 1K at constant pressure units of JK-1mol-1
Molar heat capacity at constant volume Cv?
Heat needed to raise the temperature of 1 mol of a gas by 1K at constant volume units of JK-1mol-1
Intensive property?
Property of a substance that doe not depend on the quantity of a substance eg specific heat capacity, density, pressure
Extensive property?
Depends on the quantity of the substance eg mass, length, volume
Enthalpy change?
Heat transferred at a constant pressure by a chemical reaction or process
State function?
Quantity whose value only depends on the initial and final state of the system but not on the route taken to get from the initial to the final state