Lesson Plan: C2.1.03

Hamble Lesson Observation Plan
Learning About
How do surface area and concentration affect the rate of a chemical reaction?
Keywords:
  • Pressure: The force applied perpendicular to the surface of an object per unit area over which that force is distributed. (1)
  • Concentration: The amount of a substance per defined space. (1)
  • Concentration: the amount of a substance per defined space. (often measured as mol/dm3 or g/dm3) (1)
Memory Anchor:
Method Precise Learning Objective Linked Question / Activity
(Designed for maximum working out)		 Stepping Stones Pitstop Check
(Thinking Map)
Students should be able to predict and explain the effects of changes in the size of pieces of a reacting solid in terms of surface area to volume ratio How does increasing the surface area to volume ration of a solid reactant affect the rate of a chemical reaction?

Investigate particle size impact on rate of reaction. Collecting gas using water troughs. Calculate rate using 1 / time taken.
Increasing the concentration increases the frequency of collisions and makes the collisions and so increases the rate of reaction. How does increasing the concentration of reactants in reacting gases, and the surface solution, the pressure of area of solid reactants increase the rate of a chemical reaction?
Students should be able to recall how changing the concentrations of reactants in solution affects the rate of chemical reactions. How does increasing the concentration of reactants in solution affect the rate of chemical reactions?

Go further: create summary diagrams to explain these effects without using any words.
Increasing the concentration of reactants in solution, the pressure of reacting gases, and the surface area of solid reactants increases the frequency of collisions and so increases the rate of reaction.

Students should be able to use simple ideas about proportionality when using collision theory to explain the effect of a factor on the rate of a reaction. How does changing the concentration of a reactant from 1M to 2M affect the rate of a chemical reaction?

Extended writing: Use collision theory to explain the change in rate of reaction in terms of particle behaviour for: • Concentration • Pressure • Surface area • Temperature • Catalyst.
Students should be able to predict and explain using collision theory the effects of changing conditions of concentration, pressure and temperature on the rate of a reaction How does increasing the concentration of a solution reactant or the pressure of a gas reactant affect the rate of a chemical reaction?
Students should be able to recall how changing the surface area of solid reactants affects the rate of chemical reactions. How does increasing the surface area of solid reactants affect the rate of a chemical reaction?
Links To the Big Ideas
ForcesParticlesEnergyCells