Science 10
Mr. Bellman
Chemistry
Ch 6 Factors Affecting the Rate of Chemical Reactions
wkst 3 (16 )
NAME____________________
Date______________Bk_____
From page 272
Read the beige area at the top of page 272.
1. What are the four main factors that affect the rate of chemical reactions?
2. Define rate of reaction.
3. A reaction that occurs quickly has a _______________ reaction rate.
4. A reaction that takes a long time has a ______________ reaction rate.
5. Can we speed up or slow down reaction rates? _______________
6. Define temperature.
7. What happens to the rate of a reaction when the temperature is raised?
8. What happens to the rate of a reaction when the temperature is lowered?
9. Why does heating affect reaction rate?
10. Why does cooling affect reaction rate?
11. When you heat up a reaction and it goes faster, do the reactants gets used up faster, slower or no change?
12. So with your answer to Q 10, will the reaction last longer, shorter or stay the same when you heat it?
13. Define concentration.
14. If there is a greater concentration of reactant atoms and molecules present, there is a ____________ chance that a collision will
occur. The more collisions means a ____________________ reaction rate.
15. Increasing the concentration of the reactants usually results in a ________________ reaction rate.
16. Decreasing the concentration of reactants, there is ___________ chance for collisions which results in a _____________
reaction rate.
17. What is happening in fig 6.14 to increase reaction rate?
18. What is happening in fig 6.15 to increase reaction rate?
19. What is happening in fig 6.16 to increase reaction rate?
20. Define surface area.
21. Increasing the surface area will ________________ the number of collisions of reactant molecules which _____________
reaction rate.
22. Which has more surface area, a block of some material or the material made into a powder?
23. Which has more surface area, a large block of wood or smaller bits of wood like kindling?
Think of why we use small bits of wood to start a campfire.
24. Define catalyst.
25. Can raising the temperature and concentration to speed up reactions always be done? Explain using living cells.
26. What are biological catalysts called?
27. How do catalysts speed up chemical reaction?
28. What is a catalytic converter?
29. What harmful gases do catalytic converters remove so they don’t get into the air?
30. Check out the explore more section page 277 and the website www.bcscience10.com to go to find out more.