Use the particle model of matter to cooling a explain expansion and contraction at Exploring: Expansion and contraction bimetallic strip. different temperatures. Students research some uses for State what is meant by density and expansion and contraction, and some recall its units and the factors that problems caused by these (and how affect it. the problems are overcome). Securing Describe how the volumes and densities Explaining: Bimetallic strip of substances change at different Show students a bimetallic strip and temperatures. explain that it is made from two Identify some consequences of changing different metals stuck together. Show the temperature of objects or what happens when it is heated and substances, such as structures ask them to suggest why this expanding or contracting. happens. Ask them to predict what Explain how density depends on mass will happen when it cools and why. and volume. Use the particle model of Plenary: Thinking about particles and matter/particle theory to explain density density changes at different temperatures. Consider All Possibilities: The volume Exceeding of a substance changes. (Possible Use quantitative information on answers: it is a gas that has been put expansion and contraction. into a bigger/smaller container; it has Working Scientifically been heated and has expanded; it Describe how to measure the volume of has been cooled and has contracted.) regular and irregular objects. Change the subject of a simple mathematical formula. Lesson 8Ib: Changing state Learning objectives Exemplar teaching activities Differentiation Resources Maths skills Practical skills Developing Starter: Handwarmer n/a Resources n/a Students gently Recall that ice is less dense than Show students the type of from 8Ib heat a beaker water. that uses a state change to Exploring of ice and Describe the ways in which the volume produce heat. Flex the handwarmer Science. record the and density changes during the before setting it off to show that it is temperature at transition are different from other liquid, then click the disc and pass it regular intervals materials. around to allow students to feel the until the ice has Explain how chemical changes are warmth. Ask them to use ideas about melted and the different from physical changes and particles to explain why it feels warm. water has been
Use the particle model of matter to explain expansion and contraction at different temperatures. State what is meant by density and recall its units and the factors that affect it. Securing Describe how the volumes and densities of substances change at different temperatures. Identify some consequences of changing the temperature of objects or substances, such as structures expanding or contracting. Explain how density depends on mass and volume. Use the particle model of matter/particle theory to explain density changes at different temperatures. Exceeding Use quantitative information on expansion and contraction. Working Scientifically Describe how to measure the volume of regular and irregular objects. Change the subject of a simple mathematical formula. Exploring: Expansion and contraction Students research some uses for expansion and contraction, and some problems caused by these (and how the problems are overcome). Explaining: Bimetallic strip Show students a bimetallic strip and explain that it is made from two different metals stuck together. Show what happens when it is heated and ask them to suggest why this happens. Ask them to predict what will happen when it cools and why. Plenary: Thinking about particles and density Consider All Possibilities: The volume of a substance changes. (Possible answers: it is a gas that has been put into a bigger/smaller container; it has been heated and has expanded; it has been cooled and has contracted.) cooling a bimetallic strip. Lesson 8Ib: Changing state Learning objectives Exemplar teaching activities Differentiation Resources Maths skills Practical skills Developing Recall that ice is less dense than water. Describe the ways in which the volume and density changes during the transition are different from other materials. Explain how chemical changes are different from physical changes and Starter: Handwarmer Show students the type of that uses a state change to produce heat. Flex the handwarmer before setting it off to show that it is liquid, then click the disc and pass it around to allow students to feel the warmth. Ask them to use ideas about particles to explain why it feels warm. n/a Resources from 8Ib Exploring Science. n/a Students gently heat a beaker of ice and record the temperature at regular intervals until the ice has melted and the water has been
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