102D_SP11_wk05_doc2-rateeffects-key

102D_SP11_wk05_doc2-rateeffects-key - Section: Team:...

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Section: KEY 102D week 5, doc 2 Team: Manager: Blogger: Scribe: Researcher: Effects on Reaction Rates GOALS Understand the importance of collision theory for a chemical reaction Understand transition state theory Understand the importance of activation energy for a chemical reaction Understand how temperature affects the rate of a reaction and k SKILLS Be able to draw and analyze a potential energy diagram Be able to use the Arrhenius equation Collision Theory Reaction type Rate law Integrated rate law zero order Rate = k [A] t = - k t + [A] 0 first order Rate = k [A] ln [A] t = - k t + ln [A] 0 second order Rate = k [A] 2 1 [ ] t A = k t + 0 1 [ ] A The above table summarizes the rate law and integrated rate law equations learned previously. 1. How is the rate of each of the following reactions affected by concentration? a. Zero order not affected b. First order increases as [A] increases c. Second order increases with [A] 2
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2. In order for a chemical reaction to occur, molecules or atoms must come in contact with one another. Explain how concentration will affect the collision of molecules with one another. Greater concentration of molecules increases chance of collision of the molecules. 3. Use your imagination: You are at a carnival and you are trying to win a goldfish by tossing a ball into a goldfish bowl. To win a goldfish, you must get a ball into the bowl. a. Will every ball that you throw hit a goldfish bowl? Why or why not? No, some will go into the spaces between the bowls. b. Will every ball that hits a goldfish bowl win a goldfish? Why or why not? No, some will bounce off the sides and rims, not into the mouths of the bowls. 4. In addition to molecules or atoms needing to come in contact with one another, it is also necessary that molecules or atoms are oriented correctly. Based on this and your analysis of the goldfish game, do you think that every molecular/atomic collision results in a chemical change? Why or why not? No, molecules must collide in the proper orientation in order to react. 5. If you are planning to dunk the clown in the dunk tank at the carnival, would your aim with the tennis ball at the target have an effect on your being able to accomplish the task? Yes, good aim means better chance of dunking. 2
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Transition State Theory In the previous section, you learned that molecules must collide in order for a reaction to take place. These collisions are influenced by concentration and temperature. But what happens to the reactant molecules as they come together during a collision? 6.
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102D_SP11_wk05_doc2-rateeffects-key - Section: Team:...

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