Rate of reaction exam tips

Exam tips

• Understand Temperature Effects

  Use remember that increasing temperature increases particle speed, which leads to more frequent and energetic collisions.

  This keeps your answer aligned with Collision theory and activation energy and the approved Chemistry 8462 objective to explain that increasing temperature increases particle speed.

• Understand Temperature Effects

  Use remember that increasing temperature increases the speed of particles, leading to more frequent collisions.

  This keeps your answer aligned with Collision theory and activation energy and the approved Chemistry 8462 objective to explain that increasing temperature increases collision frequency.

• Understand Activation Energy

  Use focus on how increasing temperature affects the proportion of particles that have energy equal to or greater than the activation energy.

  This keeps your answer aligned with Collision theory and activation energy and the approved Chemistry 8462 objective to explain that increasing temperature increases the proportion of particles with energy equal to or greater than activation energy.

• Understand Collision Theory

  Use review how collision theory explains the rate of reactions by focusing on particle collisions and energy requirements.

  This helps you connect practical observations to theoretical concepts, enabling you to explain rate changes effectively in your exam.

• Understand Collision Theory

  Use focus on distinguishing between collision frequency and collision energy when explaining how reaction rates change.

  This understanding is crucial for accurately describing how factors like temperature and concentration affect reaction rates.

• Understand Catalysts

  Use memorize the definition of a catalyst and its role in chemical reactions.

  This keeps your answer aligned with Catalysts and the approved Chemistry 8462 objective to define a catalyst as a substance that changes the rate of a chemical reaction but is not used up.

• Visualise the Alternative Pathway

  Use draw a simple reaction profile for the uncatalysed and catalysed reaction, marking the lower activation energy peak for the catalyst. Then, in your answer, describe how the catalyst offers a different, lower‑energy route while keeping the overall energy change the same.

  Seeing the two profiles side‑by‑side reinforces that the catalyst changes the pathway, not the final energy, and helps you explain the effect on rate in exam questions.

• Understand Catalyst Pathways

  Use focus on how catalysts lower activation energy and provide an alternative reaction pathway during your revision.

  This keeps your answer aligned with Catalysts and the approved Chemistry 8462 objective to explain that a catalyst pathway has a lower activation energy.

• Understand Reaction Profiles

  Use familiarize yourself with how to read and interpret reaction profiles for both catalysed and uncatalysed reactions.

  This keeps your answer aligned with Catalysts and the approved Chemistry 8462 objective to use reaction profiles to compare catalysed and uncatalysed reactions.

• Understand Catalysts and Activation Energy

  Use focus on how catalysts lower activation energy and provide an alternative pathway for reactions.

  This keeps your answer aligned with Catalysts and the approved Chemistry 8462 objective to explain why catalysts increase reaction rate using activation energy.