Lesson Plan: C2.1.02

Hamble Lesson Observation Plan
Learning About
How do temperature and pressure affect the rate of a chemical reaction?
Keywords:
  • Surface area: A measure of the total area that the surface of the object occupies. (1)
  • Frequency: The number of occurrences of a repeating event per unit of time. (1)
  • Activation energy: The energy required to start a chemical reaction. (1)
  • Rate: The speed at which a chemical reaction proceeds. (1)
  • Collision: An event in which two or more bodies exert forces on each other for a relatively short time. (1)
Memory Anchor:
Method Precise Learning Objective Linked Question / Activity
(Designed for maximum working out)		 Stepping Stones Pitstop Check
(Thinking Map)
Collision theory explains how various factors affect rates of reactions. According to this theory, chemical reactions can occur only when reacting particles collide with each other and with sufficient energy. What are the main principals of the collision theory?

use the fluffy balls to represent particles in reactions with changing factors. e.g higher/lower concentrations
Factors which affect the rates of chemical reactions include: the concentrations of reactants in solution, the pressure of reacting gases, the surface area of solid reactants, the temperature and the presence of catalysts. What factors can affect the rate of a chemical reaction?

Circus of mini practicals measuring the rate of reaction. Students record their results in the table (shared area). Go further: In terms of rates of reaction explain why grass needs to be cut more often in the summer months. You should include any relevant chemical equations.
The minimum amount of energy that particles must have to react is called the activation energy. What does the term activation energy mean?
Increasing the temperature increases the frequency of collisions and makes the collisions more energetic, and so increases the rate of reaction.

The minimum amount of energy that particles must have to react is called the activation energy. How does increasing the temperature increase the rate of a chemical reaction?
Students should be able to recall how changing the pressure of reacting gases affects the rate of chemical reactions. How does increasing the pressure of reacting gases affect the rate of a chemical reaction?
Students should be able to recall how changing the temperature affects the rate of chemical reactions. How does decreasing the temperature of a chemical reaction affect the rate?
Links To the Big Ideas
ForcesParticlesEnergyCells