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Physical Science Pages 212-213 Ms. Cilli December 9, 2011

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Explain what a reaction rate is. Describe the factors affecting chemical reaction rates. Physical Science pages 212-213

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Reaction rates: Tells us how ______ a reaction is going What are some things that affect rates?

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Temperature The hotter the temperature, the faster the particles move. The faster the particles move, the more times they are going to collide. More collisions = _____ reaction rate Physical Science pages 212-213

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Do you think the more surface exposed will affect the reaction rate?

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Increasing surface area. Physical Science pages 212-213 An ________ in surface area increases the exposure of ___________ to each other The ________ the exposure, the _______ collisions Overall, the reaction rate will _________.

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When you put sugar in coffee, why do you stir the coffee? Physical Science pages 212-213

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Increasing the concentration __________ the reaction rate Why?

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What is it? What does it do? Where is it written? Physical Science pages 212-213

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2SO 2 + O 2 2SO 3 V2O5V2O5

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Physical Science pages 212-213

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5 Factors Review: 1. 2. 3. 4. 5.

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BOR TIME On the next few slides you will see some graphs. You will need use the info we learned today in class and from the graph to describe what is happening to the reaction rate as there is a change in one of the factors. Each person needs to discuss ____ graph Call me in when you are done

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As the temperature increases in degrees Celsius, what is happening to the reaction rate? What would happen to the reaction rate if the temperature would decrease? As the temperature increases in degrees Celsius, what is happening to the reaction rate? What would happen to the reaction rate if the temperature would decrease?

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Which one was had more dissolve particles in a solution (greater volume) over time? Why would the powder react quicker than the lump? Which one was had more dissolve particles in a solution (greater volume) over time? Why would the powder react quicker than the lump?

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Which one required less energy to react (reacted faster)? Which line indicates that a catalyst was used in the reaction? Which one required less energy to react (reacted faster)? Which line indicates that a catalyst was used in the reaction?

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Which one has the higher concentration of the red substance? Which one will have a faster reaction rate?

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In general, if the temperature of a chemical reaction is increased, the reaction rate will _______. A.Increase B.Decrease C.Stay the same D.Cannot be predicted In general, if the temperature of a chemical reaction is increased, the reaction rate will _______. A.Increase B.Decrease C.Stay the same D.Cannot be predicted Reaction rates do not tell you how fast _________. A.Reactants are being consumed B.Products are being formed C.Substances are changing D.Energy is being absorbed or released Reaction rates do not tell you how fast _________. A.Reactants are being consumed B.Products are being formed C.Substances are changing D.Energy is being absorbed or released Physical Science pages 212-213

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Independent Practice: Read pages 217-219 Start studying for the chapter 7 Test Work on the study guide Homework: NONE!!!! Physical Science pages 212-213