Reaction Controls
Move the sliders to simulate changes in concentration, temperature, surface area, and catalysts. The model follows collision theory: more frequent or more energetic collisions increase the rate.
Rate Meter
Moderate rate: collisions happen regularly but not frequently enough to be vigorous.
The chart shows how rate falls as reactants get used up. Higher rates start higher and drop faster.
Collision Theory Checkpoints
Key Ideas
For a collision to be successful, particles must collide with enough energy and in the correct orientation. Increasing temperature increases particle energy and frequency of collisions. Increasing concentration or surface area increases the collision frequency.
Exam Style Reminder
When explaining rate changes, always reference collision frequency and energy. Use the language: "more successful collisions per second" and "a greater proportion of collisions have enough energy to react".
Quick-Fire Quiz
Answer each question. Your score updates instantly. Reset to try again.