Good Science Victorian Curriculum Year 7

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INVESTIGATIONS Investigation 5.7A Separating colours using paper chromatography KEY SKILL WRITING A RESEARCH QUESTION Turn the aim of this investigation into a question that asks what you are trying to discover. This is called a research question. Hint #1: Make sure that your research question has a question mark at the end. Hint #2: Your research question can also be used as a title for an experiment report. 30 min Level 2 QUESTIONS 1 Which confectionery colours are single substances and which ones are mixtures? 2 How many different dyes are needed to make all the confectionery colours? CONCLUSION Copy and complete: ‘The results show that: (respond to the aim)’. AIM To investigate how chromatography can be used to separate colours MATERIALS • coloured confectionery; e.g. jelly beans, Skittles, Smarties • small beaker of water • filter paper • plastic pipette • watchglass METHOD 1 Place a sample of your chosen confectionery on a watchglass, then put 2 drops of water on the sample. 2 When the colour starts to dissolve, use an eyedropper to collect some coloured solution. 3 Add 1 drop of the coloured solution in the middle of the filter paper. The filter paper can be placed on an empty beaker. 4 Add 1 drop of water and observe what happens. Record your observations. 5 Repeat steps 1–4 using a different coloured lolly. 6 Describe what happens to the sample as the solvent (water) is added. NEVER EAT ANYTHING IN THE SCIENCE LABORATORY. 162 GOOD SCIENCE VICTORIAN CURRICULUM 7
INVESTIGATIONS Investigation 5.7B Separating two immiscible liquids TEACHER DEMONSTRATION AIM To investigate using a separating funnel to separate oil and water MATERIALS • 2 × 25 mL measuring cylinders • oil • water • separating funnel • retort stand with bosshead and clamp • retort ring • measuring cylinder • 2 × 100 mL conical flasks Oil Water Separating funnel Conical flask 30 min METHOD 1 Your teacher will set up the separating equipment as shown. 2 They will measure 20 mL of water and transfer it into the separating funnel. 3 Your teacher will measure 20 mL of oil and transfer it into the separating funnel. 4 They will stopper the funnel and shake it. Next, they will place the funnel back into the retort ring and observe the mixture separating. Record your observations. 5 After two obvious layers have formed, your teacher will slowly open the tap and collect the bottom liquid into a flask. Observe the transfer of the contents into a measuring cylinder and measure the volume of the liquid collected. 6 Once your teacher pours out the remaining liquid, measure the volume collected. Record your observations. QUESTIONS 1 Describe what happened to the mixture when the separating funnel was shaken. 2 Explain why the mixture settled out after some time. 3 Consider the volumes you started with for each liquid and the volumes you recovered at the end. How would you describe the efficiency of separating a mixture using a separating funnel? CONCLUSION Copy and complete: ‘The results show that: (respond to the aim)’. 163
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GOOD SCIENCE VICTORIAN CURRICULUM Y
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MAKE EVERY LESSON A GOOD LESSON
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Chapter 5 Mixtures . . . . . . . .
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VICTORIAN CURRICULUM SCIENCE LEVELS
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CHAPTER 5: MIXTURES 2 Distillation
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Good Science Victorian Curriculum Year 7

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