Kinetics Lecture 3 Flashcards
If molecules are constantly colliding, what happens with energy?
Energy is transferred from one molecule to another
What does the kinetic theory of gases indicate?
All molecules are in constant motion
What are the three factors that affect the rate at which molecules react?
- collision rate
- collision effectiveness
- collision orientation
What happens if there are more collisions?
Increased reaction rate
What does collision rate measure?
Number of collisions per second between species
What factors affect collision rate?
- higher conc
- greater speed (kinetic energy) eg higher temp
Why does the collision need to yield a certain amount of energy?
To break bonds or form bonds
What is the energy threshold for the reaction to occur called?
The activation energy
Do all collisions lead to a reaction?
No, not all have sufficient energy to be successful
What are the two names of the top of the activation energy that the collision must get?
The transition state or
Activated complex
What does an increase in temperature do to all reactions?
Speeds them all up
For every 10 degree rise in temp how fast is the rate
The rate doubles approximately
Temperature had an affect on two factors that affect rate of reaction?
- collision frequency
- collision effectiveness
(Both because of kinetic energy)
What is the only term in the rate law that depends on temp?
K
What happens if a molecule is not oriented correctly for a collision?
Can’t form a bond
Bounces back
Ineffective collision (no reaction)
