Experiment - physical changes
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This document provides instructions for an experiment to observe physical changes by dissolving copper sulfate crystals in water and evaporating the solution. Students are asked to add copper sulfate crystals to water, stir to dissolve, observe, then evaporate the water and observe again. The aim is to identify physical changes and discuss whether any results are reversible.
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Experiment - physical changes
- 1. PHYSICAL CHANGES YEAR 8 – CHEMICAL CHANGES
- 2. AIM To observe physical changes.
- 3. EQUIPMENT • copper sulfate crystals • spatula • 100 ml beaker • stirring rod • bunsen burner • evaporating basin
- 4. RISK ASSESSMENT Risk Injury Prevention Write your risk assessment here.
- 5. METHOD 1. Pour 50 ml of distilled water into a 100 mL beaker. 2. Add a few crystals of copper (II) sulfate to the distilled water using a spatula. 3. Use a stirring rod to dissolve completely. 4. Record your observations. 5. Transfer some of your solution into an evaporating basin. 6. Set up the bunsen burner equipment for heating and place the evaporating basin on top. 7. Leave the beaker there until almost all the water has evaporated. Turn off the bunsen. 8. Record your observations.
- 6. RESULTS Record your observations here.
- 7. DISCUSSION 1. Using your results, identify some common signs that show a physical reaction has taken place. 2. Were any of your results reversible? Explain why this may or may not be so?
- 8. CONCLUSION Write your conclusion here.