Topic 4 - Kinetics

Question 1

When do reactions occur?

Answer 1

When particles collide with greater than or equal to the activation energy

Question 2

Define activation energy?

Answer 2

Minimum energy required for a reaction to occur

Question 3

Why do most collisions not lead to reactions?

Answer 3

Collide with less than the Ea

Collide at the wrong orientation

Question 4

Factors that increase the rate of chemical reactions

Answer 4

Increasing temperature - Increasing the energy of particles - more have greater or equal than the Ea

Increasing the concentration of a solution - more particles present in a given volume - more likely that particles will collide with greater or equal to the activation energy

Increasing pressure of a gas reaction - ‘’

Increasing SA of solid reactants - More of the solid’s particles are available to collide with molecules in a gas or liquid

Question 5

Define rate of reaction

Answer 5

The change in concentration of a substance in unit time

Question 6

What’s the most probable energy on a MBC

What’s the average energy on a MBC

Answer 6

Most probable is inline with the top of the peak

Average is just to the right of the peak