Question

which will increase the rate of a chemical reaction?
○ adding a catalyst
○ decreasing the pressure
○ decreasing the temperature
○ removing a catalyst

Explanation:

• A catalyst speeds up a chemical reaction by lowering the activation energy.
• Decreasing pressure (for gaseous reactions) usually reduces collision frequency, slowing the reaction.
• Decreasing temperature lowers kinetic energy, reducing reaction rate.
• Removing a catalyst would stop its rate - increasing effect. So adding a catalyst increases the reaction rate.

Answer:

A. adding a catalyst