Explaining: Hot ice Demonstrate that the process of crystallisation is exothermic by making a super-saturated solution of sodium acetate. Plenary: Thinking about energy transfers Consider All Possibilities: A substance gets warmer. (Possible answers: it is taking part in an exothermic reaction; it is heated by something.) Lesson 9Hc: Rates of reaction Learning objectives Exemplar teaching activities Differentiation Resources Maths skills Practical skills Developing Starter: Fast and slow Exploring: Resources Plotting Students work Recall some reactions that happen Ask students to compile a list of Investigating from 9Hc graph or in groups to slowly and some that happen quickly. chemical reactions that happen energy changes Exploring chart. investigate the Describe how surface area affects the slowly. Challenge students to explain Challenge Science. effect of surface rate of a reaction. how they have defined slow. Repeat students to Calculating area on the rate Apply knowledge of the kinetic theory for chemical reactions that happen sketch reaction means. of reaction to describe how reactions occur. quickly. Explain Ask: How profiles for each between ‘rate’. Interpret rate of reaction graphs you measure change. calcium ‘rate’? (including rate calculation). carbonate and Securing Exploring: Marble chips and acid hydrochloric Explain how the frequency of collisions Students work in groups to acid. affects the rate of a reaction. investigate the effect of surface area Explain the effects on rates of reaction on the rate of reaction between of changes in the surface area to calcium carbonate and hydrochloric volume ratio of a reacting solid. acid, a balance to monitor loss of Exceeding mass of the reactants as carbon Explain how the energy of collisions dioxide gas is produced and lost from affects the rate of a reaction. the flask. Explaining: UV beads model
Explaining: Hot ice Demonstrate that the process of crystallisation is exothermic by making a super-saturated solution of sodium acetate. Plenary: Thinking about energy transfers Consider All Possibilities: A substance gets warmer. (Possible answers: it is taking part in an exothermic reaction; it is heated by something.) Lesson 9Hc: Rates of reaction Learning objectives Exemplar teaching activities Differentiation Resources Maths skills Practical skills Developing Recall some reactions that happen slowly and some that happen quickly. Describe how surface area affects the rate of a reaction. Apply knowledge of the kinetic theory to describe how reactions occur. Interpret rate of reaction graphs (including rate calculation). Securing Explain how the frequency of collisions affects the rate of a reaction. Explain the effects on rates of reaction of changes in the surface area to volume ratio of a reacting solid. Exceeding Explain how the energy of collisions affects the rate of a reaction. Starter: Fast and slow Ask students to compile a list of chemical reactions that happen slowly. Challenge students to explain how they have defined slow. Repeat for chemical reactions that happen quickly. Explain ‘rate’. Ask: How you measure ‘rate’? Exploring: Marble chips and acid Students work in groups to investigate the effect of surface area on the rate of reaction between calcium carbonate and hydrochloric acid, a balance to monitor loss of mass of the reactants as carbon dioxide gas is produced and lost from the flask. Explaining: UV beads model Exploring: Investigating energy changes Challenge students to sketch reaction profiles for each change. Resources from 9Hc Exploring Science. Plotting graph or chart. Calculating means. Students work in groups to investigate the effect of surface area on the rate of reaction between calcium carbonate and hydrochloric acid.