Chapter 7- Flashcards
Change in enthalpy
Delta H: it is the energy difference between the products and the reactants of a chemical rxn
Delta H < 0 exothermic
Delta H > 0 endothermic
Enthalpy
A function representing heat under conditions of constant pressure
Which is spontaneous, exo or endo?
Exothermic
Entropy
The measure of the statistical distribution of energy in a system
Gases>liquid>solid
Gibbs free energy (G)
A function which considers both the entropy and enthalpy of a system
Thermodynamics
The study of energy, work, and heat
System
Contains the process under study
Surroundings
The universe
Energy can be gained or lost by the system from the surroundings
1st law of thermodynamics
Energy cannot be created or destroyed
2nd Law of Thermodynamics
The universe spontaneously tends toward increasing entropy
3rd Law of Thermodynamics
The entropy of a pure crystal at absolute zero is 0
Exothermic Rxn
Releases energy to it’s surroundings
Endothermic Rxn
Absorbs energy from it’s surroundings
Ions with the same charge
Repel
Rate generally increases as the what increases?
Concentration and temperature
