4.1.1 - Collision Theory

Question 1

What is the amount of energy particles need to react called !?

Answer 1

. Activation energy

Question 2

What happened to particles that collide with too little energy !?

Answer 2

. They will just rebound and remain unchanged

Question 3

The overall rate of a reaction involving millions of particles depends on :

Answer 3

.collision frequency

. Percentage sucess

Question 4

What is Collision Frequency !?

Answer 4

. How often do the particles collide with each other

Question 5

What is Percentage Success !?

Answer 5

. What percentage of the collisions have enough energy

Question 6

The Four factors affecting rate:

Answer 6

Collision frequency :
-Solid surface area
-Solution concentration

Percentage success :
- temperature
- catalysts

Question 7

Higher solid SURFACE AREA increases rate because:

Answer 7

. More of the solid is exposed to the other particles
. So the collision frequency is higher
. So there are more successful collisions per unit time

Question 8

Higher solution CONCENTRATION/ gas PRESSURE increases the rate because:

Answer 8

. There are more particles per unit volume
. so the collision frequency is higher
. So there are more successful collisions per unit time

Question 9

Higher TEMPERATURE increases the rate because:

Answer 9

. The particles have more kinetic energy
. So the percentage of collisions with enough energy is higher
. So there are more successful collisions per unit time

Question 10

CATALYSTS increase rate because:

Answer 10

. They provide an alternative route with a lower activation energy
. So the percentage of collisions with enough energy is higher
. So there are more successful collisions per unit time