There are 3 types of changes you can make to a system:

1. A change in concentration

2. A change in volume/pressure

3. A change in temperature

Changes in concentration might involve:

• Adding or removing a substance

• Increasing or decreasing the partial pressure of a substance

• Increasing or decreasing the concentration of a substance

Volume and pressure have an inverse relationship, increasing volume decreases pressure while decreasing volume increases pressure. Changes in volume and pressure include:

• Dilution (increasing volume)

• Adding an inert gas at constant pressure (increasing volume)

• Adding an inert gas at constant volume (increase pressure)

There are 3 ways to explain or describe changes to a system:

1. Using Collision Theory, which is used to explain changes (rates of reaction vs time)

2. Using Le Chatellier’s Principle, which is used to describe or predict change, (concentration vs time)

3. Using the K or Q constants