1. Rate of Reaction – Collision Theory2007 R. Mulenga Starter

2. Rate of Reaction – Collision Theory2007 R. Mulenga Learning Objectives Increasing the number of collisions between particles increases the rate of reaction How temperature, concentration and surface area affect the rate of reaction

3. Rate of Reaction – Collision Theory2007 R. Mulenga Rates of Reaction & Collision Theory ANIMATION

4. Rate of Reaction – Collision Theory2007 R. Mulenga Which reaction is faster? Why? COOL PARTICLES HOT PARTICLES

5. Rate of Reaction – Collision Theory2007 R. Mulenga Which reaction is faster? Why? DILUTE SOLUTION CONCENTRATED SOLUTION

6. Rate of Reaction – Collision Theory2007 R. Mulenga Which reaction is faster? Why? BIG PIECE (small surface area) SMALL PIECES (large surface area)

7. Rate of Reaction – Collision Theory2007 R. Mulenga Your presentation should: Explain that particle collisions are needed for a reaction Explain how the number of collisions affects the rate of reaction Explain how concentration OR temperature OR surface area affect the rate of reaction COUNTDOWN TIMER

8. Rate of Reaction – Collision Theory2007 R. Mulenga Presentations & Feedback

9. Rate of Reaction – Collision Theory2007 R. Mulenga TRUEFALSE TRUE OR FALSE Collision theory helps us to explain rates of reaction

10. Rate of Reaction – Collision Theory2007 R. Mulenga TRUEFALSE TRUE OR FALSE Reaction rates depend on temperature

11. Rate of Reaction – Collision Theory2007 R. Mulenga TRUEFALSE TRUE OR FALSE Reactions will speed up if they are heated

12. Rate of Reaction – Collision Theory2007 R. Mulenga TRUEFALSE TRUE OR FALSE Dilute solutions of reactants will react faster than concentrated solutions of reactants

13. Rate of Reaction – Collision Theory2007 R. Mulenga TRUEFALSE TRUE OR FALSE Reactions slow down if they are diluted

14. Rate of Reaction – Collision Theory2007 R. Mulenga TRUEFALSE TRUE OR FALSE A powdered reactant will react slower than a solid lump of reactant

15. Rate of Reaction – Collision Theory2007 R. Mulenga TRUEFALSE TRUE OR FALSE A larger surface area decreases the number of useful collisions

16. Rate of Reaction – Collision Theory2007 R. Mulenga TRUEFALSE TRUE OR FALSE When particles collide they always react

17. Rate of Reaction – Collision Theory2007 R. Mulenga “Match of the Day” Temperature Concentration Surface Area There are more particles to collide There is a bigger surface area for other particles to collide with Particles move faster and so there are more collisions and collisions have more energy