A student says, 'Potassium and iron are both metals, so they must behave in the same way.' Which observation shows that the student is wrong?
Both metals conduct electricity when they are solid
Both metals have a shiny surface when freshly cut
Potassium reacts violently with water but iron does not
Both metals form positive ions when they react
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.