Warm up
2-12-16
1. 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
Homework
-Notes Unit 7-4
-Lab Reaction rate
-WS reaction rate
Feb 16 - Quiz
Feb 16 - Progress report
Feb 18 - Extra credit due
Notes Unit 7-4
Activation Energy
Activation Energy
• Activation energy (Ea) - 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
• 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?
Check In
Exothermic or Endothermic?
Lab Reaction Rates
• Use the correct graduated cylinder to obtain the
solutions
• PART 2 DIAGRAM:
Graduated
Cylinders
Thermometer
• Get temperature data from other groups
Assignments
• Notes Summary
• Lab reaction rate (due today)
• WS reaction rates (due next class)
• Quiz Tuesday