1. Drill # 7 (4B) 4/24/13 List 5 factors that affect reaction rate:
Nature of reactants
Temperature
Concentration
Surface area
Catalysts

2. Objectives SWBAT discuss 5 factors that affect reaction rates
SWBAT determine whether a reaction is exothermic or endothermic based on a potential energy diagram.
SWBAT identify activation energy and potential energy of reactants and products on a diagram.

3. Agenda Reaction Rate Inquiry Activity
Notes on Reaction Rates & Energy in Chemical Reactions
Questions and Worksheet

5. Factors that affect reaction rate:
Nature of Reactants – different atoms, molecules, or compounds react with each other in certain ways (ex. Na reacts vigorously with water)
Surface Area – two reactants must be in contact with each other to react. Gases and dissolved particles collide freely, so react faster.

6. Factors that affect reaction rate:
Temperature – Increasing kinetic energy, increases motion & collisions. Also increases energy.
Concentration – Increasing conc., increases collisions, so increases reaction rate
Catalyst – lower the activation energy so that reaction has enough energy.

7. Reaction Rate

8. What is Reaction Rate?
The change in concentration of reactants per time.

9. Collision Theory
In order for a reaction to occur, there must be a COLLISION.
Collision Theory provides two requirements for reactants to yield products:
1. Reaction needs enough energy
2. Colliding molecules must be oriented in a way to react

10. Drill – 6/14/11
1. What does each letter represent in the above energy diagram?
2. Is this reaction endothermic or exothermic?

11. Drill – 6/13
Use the following data to determine the rate law for the equation: 2X + Y  3XY
Experiment
[X]
[Y]
Rate (M/s) 1
0.10
0.20
1.40 2
0.30
12.6 3
0.40
5.60

12. Drill – 6/10/11
How would doubling the value of X affect the value of Y in each case. What about tripling?
Y = X0
Y = X1
Y = X2
Y = X3