Thermodynamics Flashcards

A way to study for chem test

41 cards   |   Total Attempts: 182
  

Cards In This Set

Front Back
1st law of thermodynamics
The total energy of the universe is constant
2nd law of thermodynamics
The total entropy of the universe is always incresing
3rd law of thermodynamics
The entropy of every pure perfectly formed crystalline substance at absolute zero is zero
A negative delta H is what kind of reaction?
Exothermic
A positive delta H is what kind of reaction?
Endothermic
Definition of entropy
Measure of disorder
4 rules of entropy
1. gases have greater entropy than liquids
2. liquids have greater entropy than solids
3. entropy of a system increases as temp increases
4. in a chemical reaction the side with more mols has greater entropy
Thermochemistry
The heat changes that occur during chemical reactions
Energy
The capacity for doing work or supplying heat
What is the energy stored in chemical bonds called?
Chemical potential energy
Heat
Energy that transfers from one object to another becuase of a temperature difference between them.
Calorie
The quantity of heat needed to raise the temp of 1g of pure water 1 degree C
Kilocalorie
Equal to 1000 calories
Joule
The SI unit of heat and energy named after the English physicist James Prescott Joule
How many joules in 1 calorie?
4.184 Joules