Kinetics - Collision Theory

Question 1

What is the collision theory?

Answer 1

For a chemical reaction to take place the particles need to collide with eachother in the correct orientation with enough energy.

Question 2

What is an ineffective collision?

Answer 2

This is when particles collide in the wrong orientation or when they don’t have enough Ea to bounce off each other without causing a chemical reaction.

Question 3

What is a successful collision?

Answer 3

When particles collide with sufficient energy to result in a reaction

Question 4

What is the collision frequency?

Answer 4

• the number of collision per unit time
• the more collision per unit time take place the number of particles with energy greater than the Ea increases.

Question 5

What is activation energy?

Answer 5

• for a reaction to take place, particles need to overcome a minimum amount of energy (Ea)

Question 6

What happens in exothermic reactions?

Answer 6

-the reactants are higher in energy than the products.

Question 7

What happens in endothermic reactions?

Answer 7

The reactants are lower in energy than the products.

the activation energy in endothermic reactions is relatively larger than in exothermic reactions.

Question 8

what is enthalpy change?

Answer 8

A heat change at a constant pressure

Question 9

Enthalpy change in exothermic reactions

Answer 9

• enthalpy of the reacting system decreases
  -enthalpy change is negative
• energy is transferred from the reacting system to the surroundings.

Question 10

Enthalpy change in endothermic reactions

Answer 10

-The enthalpy of the reacting system increases
- Enthalpy change is positive
- energy is transferred to the reacting system from the surroundings.

Question 11

What change is this for?

Answer 11

Endothermic

Question 12

What change is this for?

Answer 12

Exothermic