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Chemical Kinetics• The area of chemistry
concerned with the speed at which reactions occur is called chemical kinetics.
– Reaction rate is the change in concentration of reactants and products in a certain amount of time.
Average rate of reaction = Δ [reactant or product]
Δ time
Collision Theory
Key Idea: Molecules must collide to react.
•In order to react molecules and atoms must come in
contact with each other.
•They must hit each other hard enough to react.
•Anything that increase these will make the reaction
occur faster.
Ene
rgy
Reaction coordinate
Reactants
Products
Activation Energy - Minimum energy to make the reaction happen
Your To-Do List for Today• Work independently and quietly! • In your books:
• Read & take notes on “Reaction Rates” on pg. 722-724
• Answer Question #1 on pg 731
• Read & take notes on 22-2 on pg. 732-737
• Answer Questions #1,2,5 on pg. 737
• Read & take notes on 22-3 on pg. 738-743
• Answer Questions #1-3
• DUE MONDAY!!
2NO2(g) 2NO(g) + O2(g)Reaction Rates:
2. Can measure appearance of products
1. Can measure disappearance of reactants
3. Are proportional stoichiometrically
DMA#8 4/15/13Name 3 things that could increase the rate at which a chemical reaction happens.
4th Period- Get out homework for grading!
Catalysis
•Catalyst: A substance that speeds up a reaction without being consumed
•Enzyme: A large molecule (usually a protein) that catalyzes biological reactions.
Exothermic Reaction with a Catalyst This is the same graph you sketched last time, so you can
just add the new catalyst activation energy.