1. Chapter 17 General Chemistry Mr. Mata
Reaction Kinetics
Chapter 17
General Chemistry
Mr. Mata

2. Standard 8b
Students will know how reaction rates depend on factors like concentration, temperature, & pressure.

3. Essential Question:
What factors influence the reaction rate of a chemical reaction?

4. What is a Reaction Rate? Chemical kinetics = rates of reaction
Reactants disappear/products appear .
Reaction rate is fastest at the beginning of reaction and slows down as reactant concentrations decrease.
Three factors must be met for reactions to occur:
Collision frequency
Orientation
Activation energy (Ea)

5. Collision Theory
Collision frequency = which particles make contact with each other.
Key idea: molecules must collide with each other to react.
Successful collisions:
Collide with each other .
Have the correct orientation.
Have enough energy to break bonds.

6. Unsuccessful Collisions
Orientation
Particle Orientation
Required Orientation
Unsuccessful Collisions
Successful Collision

7. Activation Energy (Ea)
minimum energy required for a chemical reaction to occur.
Activation
Energy

8. Activation Energy (Ea)
Low Ea = instantaneous reaction
High Ea = slower reaction Ea

9. Factors affecting Reaction Rate
Surface area
High surface area = fast reaction rate
More opportunities for collisions.
Increase surface area by…
Using smaller particles.
Dissolving in water.

10. Factors affecting Reaction Rate
Concentration
high concentration = fast reaction rate
more opportunities for collisions.

11. Factors affecting Reaction Rate
Temperature
- High temperature = fast reaction rate
Higher kinetic energy
Faster moving particles.
More likely to reach activation energy.
Generally, rate of reaction doubles for each 10 C temperature increase.

12. Factors affecting Reaction Rate
Catalyst
substance that increases reaction rate without being consumed in the reaction.
lowers the activation energy.

13. Chapter 17 SUTW Prompt
Describe how temperature, concentration, and surface area affect chemical reaction rates.
Complete a sentence paragraph using the SUTW paragraph format. Hilight using green, yellow, and pink.
Due Date: Monday, December 5th, 2016(start of class).