Collision Theory - Impact for a Chemical Reaction Why? The collision theory states that a chemical reaction can only occur between particles when they collide (hit each other). The collision between reactant particles is necessary but not sufficient for a reaction to take place. The collisions also have to be effective.
CollisionTheory Model: CollisionTheory In the picture below, the baseball bat represents Reactant A and the baseball represents Reactant B. A reaction will only be successful if the batter hits a homerun. If the batter does not hit a homerun, the reaction will be considered a failure. Now, read the four scenarios below and answer the key questions that follow. Scenario 1: The pitcher throws a fastball down the middle of the plate. The batter takes a mighty swing and totally misses the ball. The umpire yells, 'Strike one!' Scenario 2: The pitcher throws an off-speed pitch and the batter checks his swing. The batter just barely makes contact with the ball and it dribbles down in front of the batter’s feet into foul territory. The umpire yells, 'Foul ball; strike two!' Scenario 3: The pitcher throws a curve ball that looks like it might catch the outside corner of the plate. The batter swings with all his strength, but the bat grazes the underside of the ball and the ball skews off to the right, flying into the crowd. The umpire yells, 'Foul ball, still two strikes!' Scenario 4: The pitcher throws another fastball down the middle of the plate. The batter swings and wallops the ball high into the air and the ball clears the center field wall that reads 410 feet. The ump yells, 'Homerun!' ©POGIL 2005, 2006 2/4 Authored by: Bryan Horan; Revised by: Kelly Levy and Kenneth Levy Edited by Linda Padwa and David Hanson, Stony Brook University
![Collision Collision](/uploads/1/2/3/6/123689967/785829168.png)
CollisionTheory Key Questions 1. Did a reaction take place between Reactant A and Reactant B in Scenario 1 Why or why not Explain your reasoning in terms of the nature of the collision. 2. Did a reaction take place between Reactant A and Reactant B in Scenario 2 Why or why not Explain your reasoning in terms of the nature of the collision. 3. Did a reaction take place between Reactant A and Reactant B in Scenario 3 Why or why not Explain your reasoning in terms of the nature of the collision. 4. Did a reaction take place between Reactant A and Reactant B in Scenario 4 Why or why not Explain your reasoning in terms of the nature of the collision. 5. Based on your responses to Key Questions 1-4 and your reasoning, what insight has your team gained about the term effective collision 6. Based on your answer to Key Question 5, complete the following statement: Collision theory states that a reaction is most likely to occur if… ©POGIL 2005, 2006 3/4 Authored by: Bryan Horan; Revised by: Kelly Levy and Kenneth Levy Edited by Linda Padwa and David Hanson, Stony Brook University
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