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Reaction Rates 2

Reaction Rates 2. February 14 and 15, 2013 Boon Chemistry. Take out your HW!. Catalyst. Objective I can explain how a catalyst increases reaction rate. Agenda Catalyst Reaction Rate True/False Catalysts, Enzymes, and Activation Energy 1 trillion year reaction article Exit Slip.

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Reaction Rates 2

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  1. Reaction Rates 2 February 14 and 15, 2013 Boon Chemistry

  2. Take out your HW! Catalyst • Objective • I can explain how a catalyst increases reaction rate. • Agenda • Catalyst • Reaction Rate True/False • Catalysts, Enzymes, and Activation Energy • 1 trillion year reaction article • Exit Slip What are the factors that affect reaction rates? (Use your notes from Monday!) Draw the exothermic and endothermic reaction energy diagrams.

  3. Start Up Activity: Reaction Rate True/False Slips • Instructions: • Work with a partner. • Spread the sentence strips out on your table in two groups – one group is true sentences and the other is false. • Use your notes. • When you think you have them all sorted, raise your hand to have your answers checked.

  4. Intro to Enzymes/Activation Energy • http://www.youtube.com/watch?v=D0ZyjpAin_Y&list=PLJicmE8fK0EjGmPGeh_WDu69qAsN-iHVA • Video focus questions: • What is an enzyme? Why do we need them? • What are the four ways that enzymes speed up chemical reactions?

  5. Collision Theory of Reactions Collide = hit each other • In order to react molecules and atoms must collide. • They must collide with enough energy and at the correct angle to make a reaction happen. • Activation Energy is the minimum amount of energy required to start a chemical reaction.

  6. Reactants Energy Products Reaction coordinate

  7. Activation Energy - Minimum energy to make the reaction happen Reactants Energy Products Reaction coordinate

  8. Activated Complex or Transition State Reactants Energy Products Reaction coordinate

  9. Reactants Energy Overall energy change Products Reaction coordinate

  10. What is a catalyst and how does it affect reaction rate? • We know that increasing temperature, reactant concentration, surface area, and pressure all can increase the rate of a chemical reaction. • A catalyst is a substance that increases the reaction rate when it is added to a reaction mixture. • Catalysts increase the reaction rate by lowering the activation energy. • A catalyst is not a reactant or a product because it is not used up or changed during the reaction. • An enzyme is a protein that acts as a catalyst. It is a biological catalyst.

  11. Reactants Energy Products Reaction coordinate

  12. What is a catalyst? • Draw a new reaction pathway showing the addition of a catalyst on your endothermic and exothermic energy diagrams. The new reaction pathway should have the same “reactants” and “products” energy level. The hill of activation energy should be smaller.

  13. Practice • You have two practice activities. • First, complete the reaction energy diagram for the breakdown of complex carbohydrates. Follow the directions at the bottom of your worksheet. • Second, flip over your worksheet and read the article about a chemical reaction that takes 1 trillion years without a catalyst. When you are done reading, answer the questions at the bottom of the page. • If you finish early, study your notes for your exit slip or begin your homework.

  14. Exit Slip • Expectations: • You will work silently and independently. • When you are done, cover your exit slip with your handouts. • Tools: • You may use all your notes, worksheets, and flash cards. • You may use your own calculator. • What do I turn in? • You will turn in your exit slip only. • Homework: • Review Reaction rates (use Chapter 16 to find answers) pp. 597 #1, 7, 12, 14, 18, pp. 598 #26, 29 • Read about equilibrium: pp. 496 – 501 Define the key terms: reversible reaction, chemical equilibrium, completion reaction

  15. Homework • Review Reaction rates (use Chapter 16 to find answers) pp. 597 #1, 7, 12, 14, 18, pp. 598 #26, 29 • Read about equilibrium: pp. 496 – 501 Define the key terms: reversible reaction, chemical equilibrium, completion reaction

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