Question 16
Think like a scientist: Displacing metals. You need solutions of copper sulfate, magnesium sulfate, iron sulfate and zinc sulfate; small pieces of iron, zinc, copper and magnesium; test tubes, a rack, forceps and safety glasses. Read all instructions and prepare a results table. Fill three tubes about one third full with copper sulfate solution. Add iron to one, magnesium to another and zinc to the third. Leave for a few minutes, observe and record. Repeat with magnesium sulfate and copper, iron and zinc; iron sulfate and copper, magnesium and zinc; zinc sulfate and copper, iron and magnesium. Carry out only with teacher supervision and an approved risk assessment.
