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Hot Stuff Activity 3: What’s cooking? Year 7 Upgrade
A teaching sequence from the Cook unit of upd8 wikid Year 7 Upgrade
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7E Learning Cycle – Hot Stuff
Students become Ally, a trainee chef at Gastro Heaven Apply ideas about heat transfer to different contexts The boss, Gordo, finds out if Ally knows how food gets hot and cooks The chefs test Ally’s understanding of the processes that make food hot – AfL Ally forms her own ideas about heat transfer to learn Gordo’s secrets Gordo has Ally apply his ‘secrets’ about energy transfer to cooking processes Jimella models the heat transfer processes for Ally 2 © Association for Science Education and Centre for Science Education 2010 This page may have been changed from the original 2
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Objectives: Use a model to explain how heat energy is transferred.
Explain Gordo’s three secrets using particle theory. 3 Activity 3: What’s cooking? 3
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Engage Elicit Explore Explain Elaborate Extend Evaluate What differences are there when heat travels in solids, liquids and gases? 4 Activity 3: What’s cooking?
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Engage Elicit Explore Explain Elaborate Extend Evaluate 1 Gordo’s three secrets: There are THREE ways that energy moves causing heating: CONDUCTION, CONVECTION and RADIATION. You feel the strong heating above the Bunsen because the gases expand when heated and rise. This is CONVECTION. When you put a gauze on the Bunsen it heats up red hot. This makes infrared rays. This is heat RADIATION. The desk under the bunsen gets hot as the heat travels from particle to particle in the solid bench. This is CONDUCTION. 5 Activity 3: What’s cooking?
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Why do you think metal is a faster conductor than wood?
Engage Elicit Explore Explain Elaborate Extend Evaluate Gordo’s first secret SS1 Conduction is the term used for when heat travels from particle to particle in a solid. Particles in solids are in a fixed position. Heat energy makes them vibrate faster. As the particles vibrate faster they knock into their neighbours and pass the faster vibrations to them. The heat travels up the handle making the whole spoon too hot to touch. Why do you think metal is a faster conductor than wood? 6 Activity 3: What’s cooking?
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Do you think convection can happen in solids?
Engage Elicit Explore Explain Elaborate Extend Evaluate Gordo’s second secret Convection is the term used for when heat travels in liquids and gases. Particles in liquids and gases are moving about in a random way. Heat energy makes the particles move faster. Because the particles move faster they take up more room and the liquid or gas expands. The expanded material is less dense and floats up away from the heat. Do you think convection can happen in solids? 7 Activity 3: What’s cooking?
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Why is radiation the only way that heat can travel through space?
Engage Elicit Explore Explain Elaborate Extend Evaluate Gordo’s third secret Radiation is the term used when heat energy travels in rays. Radiation does not need particles to move. Heat rays travel in straight lines and make heat shadows just like light. Why is radiation the only way that heat can travel through space? 8 Activity 3: What’s cooking?
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Use diagrams to explain how each secret makes the heat move.
Engage Elicit Explore Explain Elaborate Extend Evaluate SS2 What happens as heat cooks the food? You will need to understand this to be a chef. Draw me a poster to show each of Gordo’s secrets at work moving heat from the Bunsen. Use diagrams to explain how each secret makes the heat move. – For ‘bench heat’ explain how the particles’ movement makes this secret work. – For ‘rising’ heat’ explain what happens to the particles for this secret to work. – For ‘gauze heat’ explain how the heat travels through the air. Make sure it’s clear – Gordo wants to see it. 9 Activity 3: What’s cooking?
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And this time describe them correctly!
Engage Elicit Explore Explain Elaborate Extend Evaluate You’re back at last. Did you learn about heat transfer – or are you still useless? Match the cooking methods to the correct secret. Stir-fry Grilled Boiled Roast Fried Spit-roast And this time describe them correctly! Toasted sandwich Barbecue Steamed Deep-fried Conduction Gordo’s first secret Convection Gordo’s second secret Radiation Gordo’s third secret 10 Activity 3: What’s cooking?
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Picture credits Boiling wort 4 brettanomyces Picture Slide Credit
Activity from the Cook! unit © Association for Science Education and Centre for Science Education Teachers and others who download this material may use it freely within their institution. For any other usage consult the upd8 team, ASE and upd8 are not responsible for any revision that may be made to the material after it has been downloaded.
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