crushing; compared with the others precious metals are recycled in tiny amounts; polymers are the only ones with recycle labels.) Lesson 9Fa: Types of explosion Learning objectives Exemplar teaching activities Differentiation Resources Maths skills Practical skills Developing Starter: Changes concept map Exploring: Resources n/a Students Recall some examples of physical Ask students to construct a concept Mentos® and diet from 9Fa out the changes and of chemical changes. map using the terms coke Exploring Mentos® and ‘physical Explain how chemical reactions are change’ and reaction’. They More able Science. diet cola ‘chemical different from physical changes. could include: melting, freezing, students explosion, or Use observations to decide whether a evaporating, condensing, mixing, as compare reasons demonstrate it. chemical or physical change has taken well as the types of chemical about whether it place. reactions, such as neutralisation, is, or is not, a Demonstrate Use the kinetic theory to describe the combustion, thermal decomposition. chemical reaction the imploding cause of gas pressure. and could test can experiment. Describe how the pressure of in Exploring: Mentos® and diet coke this, for example, containers can be increased or Students can carry out the by measuring the decreased. Mentos® and diet cola explosion or it pH before and Securing can be done as a demonstration. after to see if the Use the kinetic theory to explain why acidity of the gas pressure increases or decreases as Explaining: drink changes. The imploding can the temperature, number of particles Demonstrate the imploding can or volume changes. experiment and discuss what must Exceeding have happened to cause the Identify relationships showing direct implosion. and inverse proportion by analysis of graphs involving pressure, volume Plenary: Thinking about gases and/or temperature. Consider All Possibilities: The pressure of a gas in a container decreases. (Possible answers: the temperature has decreased; some of the gas particles have escaped from the container; the volume of the container has increased.)
crushing; compared with the others precious metals are recycled in tiny amounts; polymers are the only ones with recycle labels.) Lesson 9Fa: Types of explosion Learning objectives Exemplar teaching activities Differentiation Resources Maths skills Practical skills Developing Recall some examples of physical changes and of chemical changes. Explain how chemical reactions are different from physical changes. Use observations to decide whether a chemical or physical change has taken place. Use the kinetic theory to describe the cause of gas pressure. Describe how the pressure of in containers can be increased or decreased. Securing Use the kinetic theory to explain why gas pressure increases or decreases as the temperature, number of particles or volume changes. Exceeding Identify relationships showing direct and inverse proportion by analysis of graphs involving pressure, volume and/or temperature. Starter: Changes concept map Ask students to construct a concept map using the terms ‘physical change’ and ‘chemical reaction’. They could include: melting, freezing, evaporating, condensing, mixing, as well as the types of chemical reactions, such as neutralisation, combustion, thermal decomposition. Exploring: Mentos® and diet coke Students can carry out the Mentos® and diet cola explosion or it can be done as a demonstration. Explaining: The imploding can Demonstrate the imploding can experiment and discuss what must have happened to cause the implosion. Plenary: Thinking about gases Consider All Possibilities: The pressure of a gas in a container decreases. (Possible answers: the temperature has decreased; some of the gas particles have escaped from the container; the volume of the container has increased.) Exploring: Mentos® and diet coke More able students compare reasons about whether it is, or is not, a chemical reaction and could test this, for example, by measuring the pH before and after to see if the acidity of the drink changes. Resources from 9Fa Exploring Science. n/a Students out the Mentos® and diet cola explosion, or demonstrate it. Demonstrate the imploding can experiment.
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