© Association for Science Education and Centre for Science Education 2010 This page may have been changed from the original Drunk? Fake! sequence

© Association for Science Education and Centre for Science Education 2010 This page may have been changed from the original 2 7E Learning Cycle Students watch the distillation of the guard’s juice Was the guard drunk on duty? Did his orange juice contain alcohol? Students give initial ideas Students use the web page to work out a way of separating the alcohol from the juice Students write a report on what they have found out Students learn about how distillation works © Association for Science Education and Centre for Science Education 2010This page may have been changed from the original

© Association for Science Education and Centre for Science Education 2010 This page may have been changed from the original Objectives: Use distillation to separate a mixture of liquids. Describe what happens to particles in distillation. Activity 5: Drunk? 3

© Association for Science Education and Centre for Science Education 2010 This page may have been changed from the original Activity 5: Drunk? 4 Engage ElicitExploreExplainElaborateExtendEvaluate Do these particle diagrams show pure substances or mixtures? We need to think about pure liquids and mixtures for the next part of the case.

© Association for Science Education and Centre for Science Education 2010 This page may have been changed from the original Activity 5: Drunk? 5 So what? The gallery owner didn’t believe our drugging story. He thinks that the guard had alcohol in his juice and he fell asleep drunk. He didn't do his job and stop the burglary. The owner wants to sue him! We’d better check if the juice has alcohol in it. But how? Do alcohol and juice have different physical properties? Let’s do an Internet search. Engage ElicitExploreExplainElaborateExtendEvaluate The crime scene investigators found half a glass of orange juice on the guard’s desk.

© Association for Science Education and Centre for Science Education 2010 This page may have been changed from the original Activity 5: Drunk? 6 Everything you need to know about science ScienceAnswers.com What does it mean when we say that something is pure? A pure substance is something that contains only one type of particle. The opposite of pure is a mixture. Pure substances have the same properties. Examples: Pure water contains only water particles. It always has a melting point of 0 °C and a boiling point of 100 °C. Pure ethanol (alcohol) contains only ethanol particles. It boils at 78 °C, it is highly flammable and it is soluble in water. Pure salt (sodium chloride) contains only sodium chloride particles. It has a melting point of 801 °C and a boiling point of 1465 °C. It is soluble in water. If we mix substances together we make mixtures. Examples: Sea water is a mixture of water, salt and other things (like fish!). Because the water has a boiling point much lower than salt, we can get salt from seawater by evaporation. Even though we sometimes call fruit juice pure, it is in fact a mixture of mainly water with other substances. Alcoholic drinks are a mixture of ethanol and water. To make them stronger, the alcohol can be distilled. Engage ElicitExploreExplainElaborateExtendEvaluate

© Association for Science Education and Centre for Science Education 2010 This page may have been changed from the original Activity 5: Drunk? 7 Engage ElicitExploreExplainElaborateExtendEvaluate I can show you a simple way of getting pure water from a mixture. Did you predict any problems with using this distillation technique for the guard’s juice? mixture of ink and water This page may have been changed from the original

© Association for Science Education and Centre for Science Education 2010 This page may have been changed from the original 8 Engage ElicitExploreExplainElaborateExtendEvaluate Activity 5: Drunk? What state are the the particles in at each stage? mixture in the flask leaving the flask top of the condenser bottom of the condenser SS1/2

© Association for Science Education and Centre for Science Education 2010 This page may have been changed from the original 9 Engage ElicitExploreExplainElaborateExtendEvaluate So, the technique of distillation will separate out alcohol and water. What shall we do next? Try it out on the guard’s juice! OK! But how will we know if there’s alcohol in the juice? Activity 5: Drunk? This page may have been changed from the original

© Association for Science Education and Centre for Science Education 2010 This page may have been changed from the original Activity 5: Drunk? 10 Well, that’s good evidence that the gallery owner’s theory is wrong. The guard’s juice has no alcohol in it. Engage ElicitExploreExplainElaborateExtendEvaluate Prepare a statement that includes: what we did how the technique works what would happen to juice with alcohol in it what we saw when we did the test. Make sure your science is spot on, Billie. I've got a feeling the owner is going to be hard to convince!

© Association for Science Education and Centre for Science Education 2010 This page may have been changed from the original Activity 5: Drunk? 11 So our evidence proves beyond all reasonable doubt that it was not the guard’s fault that he couldn’t stop the burglar? Are you sure, Dragon? Engage ElicitExploreExplainElaborateExtendEvaluate Brilliant, Billie. We have used science to prove that the guard is innocent. There is no way that the gallery owner can sue him for not doing his job properly now!

© Association for Science Education and Centre for Science Education 2010 This page may have been changed from the original Picture Slide Credit Picture credits Activity from the Forensics 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.