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mmcl2003 1111 2222 3333 4444 5555 6666 7777 8888 9999 10 11 12 13 14 15.

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Presentation on theme: "mmcl2003 1111 2222 3333 4444 5555 6666 7777 8888 9999 10 11 12 13 14 15."— Presentation transcript:

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2 mmcl

3 mmcl Describe how the concentration of reactants affects the speed of reaction? As reactant concentration increases the speed of reaction increases.

4 mmcl Name FOUR factors which affect the speed (or rate) of a chemical reaction? Particle Size (Surface Area) Temperature Concentration Use of Catalyst

5 mmcl When can a catalyst NOT speed up a reaction? Catalysts cannot speed up a reaction if the reaction does not take place without the catalyst. Catalysts cannot speed up a reaction if the reaction does not take place without the catalyst.

6 mmcl Describe how particle size affects the speed of reaction? As particle size decreases the As particle size decreases the speed of reaction increases speed of reaction increases

7 mmcl Describe how temperature affects the speed of reaction? As temperature increases the speed of reaction increases As temperature increases the speed of reaction increases

8 mmcl What are ENZYMES? Catalysts from living things (Biological catalysts) Catalysts from living things (Biological catalysts)

9 mmcl What is a catalyst? A substance which can speed up a reaction, but is not used up in the reaction and can be recovered chemically unchanged

10 mmcl Why does decreasing the particle size of reactants increase the speed of reaction? Smaller particles give a bigger surface area. This results in more collisions between reactants and therefore faster reactions

11 mmcl Give 2 possible effects of raising the temperature of a reaction? It can give a reaction sufficient energy to get it going ( activation energy) It can speed up a reaction once it has started.

12 mmcl What must be controlled when carrying out experiments to compare speeds of reaction? All variables other than the one being tested must be kept the same in all experiments All variables other than the one being tested must be kept the same in all experiments

13 mmcl What is a VARIABLE? Any factor in an experiment which can be changed or varied. e.g. concentration or temperature Any factor in an experiment which can be changed or varied. e.g. concentration or temperature of the solution used of the solution used

14 mmcl Give everyday examples of uses of catalysts? Zymase, in yeast, used in bread making, beer brewing. Amylase, in saliva to help food digestion. Transition metals in car catalytic converters.

15 mmcl Rates Experiments Which two of the following experiments could be used to find the effect of changing the particle size?

16 mmcl2003 2M hydrochloric acid at 25 0 C 2g of large chalk lump 2g of small chalk lumps A 2M hydrochloric acid at 15 0 C 2g of small chalk lumps B C 1M hydrochloric acid at 25 0 C 2g of small chalk lumps D

17 mmcl Rates Experiments Which two of the following experiments could be used to find the effect of changing the concentration of the acid?

18 mmcl2003 2M hydrochloric acid at 25 0 C 2g of small chalk lumps A 2M hydrochloric acid at 15 0 C 2g of small chalk lumps B 2M hydrochloric acid at 25 0 C 2g of large chalk lump C 1M hydrochloric acid at 25 0 C 2g of small chalk lumps D

19 mmcl Rates Experiments Which two of the following experiments could be used to find the effect of changing the temperature of the acid?

20 mmcl2003 2M hydrochloric acid at 25 0 C 2g of small chalk lumps A 2M hydrochloric acid at 15 0 C 2g of small chalk lumps B 2M hydrochloric acid at 25 0 C 2g of large chalk lump C 1M hydrochloric acid at 25 0 C 2g of small chalk lumps D


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