- Thermodynamics: Study of heat transfer
- Heat: Form of energy (thermal)
- Energy: Capacity to do work
Reactions either require energy or release energy
Require Energy:
- ↑Speed
- ↑movement
- ↑Temperature
- Putting Repelling particles together
Release Energy:
- ↓Speed
- ↓movement
- ↓Temperature
- Putting Attractive particles together
Types of proportionality
Directly proportional
$∝$
As one variable increases so does the other proportionally
$y=kx$
where k is an positive real number

Inversely proportional