Equilibrium - Pressure

Le Chatelier's Principle - Pressure Effects

By Thea Moore

​Understand & memorize

Temperature

Endothermic and Exothermic

Pressure

A change in the pressure on a liquid or a solid has a negligible effect.

A change in the pressure has an effect on the equilibrium when the reaction involves gases.

Multiple Choice

Pressure is the measurement of gas particle collisions against the vessel.

In which container is there the highest pressure?

• Left

• right

• They have the same pressure

• We can not tell

Multiple Choice

Which container will have a lower pressure?

• left
• right
• they both have the same pressure

Multiple Choice

The pressure inside the syringe will decrease if we move the plunger in:

• Direction A

• Direction B

• We don't have to move the plunger as the pressure will change on its own.

• None of the above answers.

Multiple Choice

Changes in pressure will only affect substances that are in the __________ state.

• gaseous
• liquid
• solid

Multiple Choice

For the reaction...
H_{2 (g)}  + Cl_{2 (g)} <=>  2HCl _(g)  +  heat
If the pressure in the system is increased, the equilibrium position will _______.

• shift to the left
• shift to the right
• not shift position at all as 2 mol gas <=> 2 mol gas