Good Science Victorian Curriculum Year 7

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INVESTIGATIONS Investigation 5.5 Froth flotation KEY SKILL IDENTIFYING AND MANAGING RELEVANT RISKS Brainstorm with a partner to identify three possible hazards or risks that may be involved in this investigation. Suggest one way that each hazard or risk could be reduced. AIM To investigate the froth flotation process MATERIALS • kerosene • liquid detergent • mixture of 3 parts sand to 1 part iron filings • water • teaspoon • large test tube • rubber stopper 20 min Level 1 METHOD 1 Pour one teaspoon of the sand and iron mixture into the test tube. 2 Add water until the test tube is about half full, then insert the stopper and shake the test tube for 10 seconds. Record your observations. 3 Remove the stopper and add 3 drops of kerosene and 7–8 drops of detergent. Insert the stopper and shake the test tube for another 10 seconds. Record your observations. QUESTIONS 1 What did you observe in the test tube after you added the kerosene and detergent? 2 Explain why the iron filings acted as they did. 3 Suggest how froth flotation could be used in industrial separation. CONCLUSION Copy and complete: ‘The results show that: (respond to the aim)’. KEROSENE IS A HAZARD. IT IS HIGHLY FLAMMABLE. NEVER USE IT NEAR MATCHES OR OPEN FLAME. NEVER INHALE OR INGEST IT. WASH YOUR HANDS IMMEDIATELY IF IT COMES INTO CONTACT WITH YOUR SKIN. 158 GOOD SCIENCE VICTORIAN CURRICULUM 7
INVESTIGATIONS Investigation 5.6A Evaporating a solution KEY SKILL IDENTIFYING LIMITATIONS TO THE METHOD AND SUGGESTING IMPROVEMENTS When you write a formal investigation report there is always a discussion section that includes a discussion of potential errors. These errors are limitations (or problems) with the method. For each error, you list a way to control it (your suggested improvement). Hint #1: Brainstorm three potential errors that might have occurred in this investigation that could have affected or changed the results you collected (for example, if through human error something was not measured accurately). Now work with a partner to suggest ways each error could be controlled. AIM To investigate what happens when a solution evaporates Copper sulfate solution Evaporating basin Gauze mat MATERIALS • copper sulfate solution • evaporating basin • Bunsen burner • heatproof mat 30 min Level 2 • tripod • gauze mat • matches METHOD 1 Place a small amount (5 mL) of copper sulfate solution in an evaporating basin. 2 Set up the apparatus as shown and put on your safety glasses. 3 Place the evaporating basin on the gauze mat and heat the solution. 4 Record your observations as the water evaporates. 5 Turn off the Bunsen burner before the last few drops evaporate. QUESTIONS 1 Describe the copper sulfate solution prior to the evaporation. 2 Describe the substance after evaporation had occurred. 3 Describe a safety precaution required for this investigation. 4 What happened to the water from the copper solution in this experiment? CONCLUSION Copy and complete: ‘The results show that: (respond to the aim)’. Bunsen burner Heatproof mat AN OPEN FLAME IS A HAZARD. TAKE CAUTION. IF YOU BURN YOURSELF, TELL YOUR TEACHER IMMEDIATELY AND PLACE THE BURNT AREA UNDER COLD RUNNING WATER FOR 20 MINUTES. COPPER SULFATE IS TOXIC. IF YOU COME INTO CONTACT WITH THE SOLUTION, TELL YOUR TEACHER IMMEDIATELY AND WASH IT OFF YOUR SKIN. ALWAYS WEAR SAFETY GLASSES. 159
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GOOD SCIENCE VICTORIAN CURRICULUM Y
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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 1: SCIENCE SKILLS 3 SEE-KNO
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CHAPTER 1: SCIENCE SKILLS 2 Get to
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CHAPTER 1: SCIENCE SKILLS 3 Organis
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Test tube brush Test tube Beaker Br
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CHAPTER 2: CLASSIFICATION 2 3 Livin
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CHAPTER 2: CLASSIFICATION 2 Seeds,
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CHAPTER 2: CLASSIFICATION Figure 2.
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CHAPTER 2: CLASSIFICATION 3 Bacteri
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CHAPTER 3: ECOSYSTEMS 3 SEE-KNOW-WO
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CHAPTER 3: ECOSYSTEMS 3 Decomposers
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CHAPTER 3: ECOSYSTEMS Table 3.2 Org
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CHAPTER 3: ECOSYSTEMS 3 Symbiosis i
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CHAPTER 3: ECOSYSTEMS 2 3 Some micr
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CHAPTER 3: ECOSYSTEMS 2 3 Removing
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CHAPTER 3: ECOSYSTEMS FINAL CHALLEN
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CHAPTER 5: MIXTURES 3 SEE-KNOW-WOND
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CHAPTER 5: MIXTURES 2 3 Filtration
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CHAPTER 5: MIXTURES 2 Distillation
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CHAPTER 5: MIXTURES 2 3 A separatin
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CHAPTER 5: MIXTURES FINAL CHALLENGE
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CHAPTER 6: EARTH, THE SUN AND THE M
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CHAPTER 7: EARTH’S RESOURCES 23 S
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Page 195 and 196: INDEX Aboriginal and Torres Strait
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Good Science Victorian Curriculum Year 7

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