Enthalpy Flashcards
Define a system and surrounding
Part of the universe which is under direct observation e.g a test tube.
Everything else is the surrounding.
Define a closed system
A system where only energy can escape.
Define an open system
A system where both energy and matter escape
Define an isolated system
A system where both energy and matter cannot escape
Define internal energy
Total energy of a system including the sum of Kinetic energy and Potential Energy.
Give the equation for change in internal energy.
U= q + w
Define enthalpy
This is when pressure is constant and energy is equal to heat of reaction.
Name the classification of energy.
Kinetic energy and Potential Energy
Give the equation for the heat of reaction.
Heat of reaction= heat of products - heat of reactants.
List the state functions and their meanings
H - enthalpy
S - entropy
T - temperature
G - Gibbs free energy
State the 1st law of thermodynamics
Law of conservation of energy which states that energy can neither be destroyed nor created.
State the 2nd law of thermodynamics
States that there is a tendency of entropy to increase in the universe
Define entropy
Degree of disorder or randomness in a system
Define spontaneity
Likelihood that the reaction will occur on its own/easily.
Give the equation for Gibbs free energy
G= H -TS
