Column A

1.
Sulfur trioxide gas (SO3) is removed from the system.

2.
More Sulfur trioxide gas (SO3) is added to the system.

3.
Oxygen (O2) is removed from the system.

4.
The temperature of the system decreases when heat is removed.
5.
More Sulfur dioxide gas (SO2) is added to the system.

6.
The pressure of the system is decreased.:
Column B
a.The system will shift right, towards the products.
b.The system will shift left towards the reactants.

1. b

2. a
3. b
4. b
5. a
6. b