Collision Theory

Question 1

What is the collision theory?

Answer 1

The likelihood that molecules will hit each other in a way that leads them to react

Question 2

3 things about collision theory?

Answer 2

1) both molecules must collide
2) both must collide with enough energy
3) Both must collide in the correct 3D orientation

Question 3

Increasing the temperature also increase _____ and ______?

Answer 3

collision frequency and % of high-energy collisions

Question 4

The greater the number of collisions per second the greater the chance that the molecules will?

Answer 4

react together

Question 5

Arrhenius Equation

Answer 5

*Don't memorize, remember relations
k=Ae^(Ea/RT)
-k= rate constant
-R= ideal gas constant 8.314 J/mol-K (different from R=0.0821L-atm/mol-K)
-T= reaction temp
-Ea= reaction's activation energy

Question 6

What is the relationship between temperature and rate constant and rate?

Answer 6

Increase temp = Increase rate constant (k) = Increase rate

Question 7

What is the relationship between reactions activation energy and rate constant and rate?

Answer 7

Increase activation energy (Ea) = Increase rate constant (k) = Increase rate

Question 8

Why increasing temperature increase a reactions rate and decrease activation energy?

Answer 8

Increasing temp increases the molecules’ speed, which increases the total number of collisions. Increasing temp increases molecules average kinetic energy (because they are moving around more/faster), which increases their ability to overcome activation energy (thus lowering the amount of energy still needed to activate the reaction)