An industrial chemist investigates the relative reactivity of five different metals, to assess their suitability for displacing copper from industrial waste streams, by adding each metal to a sample of aqueous copper(II) sulfate and measuring the maximum temperature increase. In each trial, 1.5 g of granular metal is used.
State two control variables concerning the copper(II) sulfate solution that must be kept constant to ensure the experimental results are valid.
110 exam-style questions on Edexcel GCSE Chemistry 5.1 Obtaining and using metals, covering 5.1.1 The reactivity series of metals, 5.1.2 Displacement reactions as redox reactions, 5.1.3 Extracting metals from ores by reduction, 5.1.4 Biological methods of metal extraction, 5.1.5 Resistance to oxidation and recycling metals, and 5.1.6 Life cycle assessment. Each one has a worked solution and a mark scheme showing where the marks go.