Warm up When do we know that the reaction is complete for a irreversible reaction? 2.What are the four factors that affect the rate of a irreversible reaction? 3.How will the reaction rate change if the temperature went from 30°C to 60°C? 4.What has to happen for a reaction to occur? Agenda -Notes Unit 7-4 -Lab Reaction rate -WS reaction rate Homework Feb 16 - Quiz Feb 16 - Progress report Feb 18 - Extra credit due

Notes Unit 7-4 Activation Energy

Activation Energy Activation energy (E a ) - the minimum energy particles must have in order to react Energy Diagram:

Activation Energy Example 1.Find the forward activation energy in (KJ) 2.Find the ΔH

Catalysts – Reduces the activation energy so the reaction can happen faster and easier – Catalysts are not used up in a reaction – Enzymes are proteins found in living things that increase reaction rates, a biological catalyst

Catalysts

Endo Vs. Exothermic Energy Endothermic Reactions: – Products are at a higher energy than the reactants – Products are less stable – Heat turned into making bonds Exothermic Reactions: – Products are at a lower energy than the reactants – Products are more stable – Heat go to the environment

Check In Exothermic or Endothermic?

Graduated Cylinders Thermometer Lab Reaction Rates Use the correct graduated cylinder to obtain the solutions PART 2 DIAGRAM: Get temperature data from other groups

Assignments Notes Summary Lab reaction rate (due today) WS reaction rates (due next class) Quiz Tuesday