Potassium is stored under oil. Nickel is used to make coins and is stored in the open air.
Explain why potassium is stored under oil but nickel is not.
Give two properties of nickel, other than its reactivity, that make it more suitable than potassium for making coins.
Nickel reacts slowly with oxygen when it is heated. The only product is nickel(II) oxide, NiO\text{NiO}NiO.
Write the balanced symbol equation for this reaction.
40 exam-style questions on AQA GCSE Chemistry 1.3 Properties of transition metals, covering 1.3.1 Comparison with Group 1 elements and 1.3.2 Typical properties of transition metals. Each one has a worked solution and a mark scheme showing where the marks go.