A student investigates the reactivity of four different metals by adding them to dilute sulfuric acid and measuring the maximum temperature rise. The student uses a 1 cm strip of each metal ribbon.
State two control variables concerning the sulfuric acid that must be kept constant to ensure the 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.