Chemistry OnRamps: Unit 4

Endothermic

Is a chemical reaction that absorbs heat, and is colder than the surroundings.

Exothermic

A chemical reaction where heat is released, and is hotter than the surroundings.

Free Energy is ________ when spontaneous and ________ when non-spontaneous

-, +

The First Law of Thermodynamics states:

Energy cannot be created or destroyed, but can be transferred.

If delta H is negative, the reaction is

exothermic

The Second Law of Thermodynamics states:

Heat moves from hotter objects to colder objects, unless energy is used to reverse the direction.

Are q and w path functions or state functions?

Path functions

Is Entropy positive or negative when the system becomes more ordered?

negative

What is the difference between bomb calorimetry and coffee cup calorimetry?

Bomb calorimetry has constant volume and coffee cup calorimetry has constant pressure.

What is the typical entropy of vaporization?

88 kj/mole