Magnesium, calcium, and barium are Group 2 alkaline earth metals.
Which statement correctly describes the trends in observations and properties when equal moles of these three metals are added to separate beakers of cold water?
They all float on the surface, reactivity increases down the group, and the pH of the resulting mixture decreases from magnesium to barium.
They all sink to the bottom, reactivity decreases down the group, and the solubility of the resulting hydroxides decreases from magnesium to barium.
They all sink to the bottom, reactivity increases down the group, and the pH of the resulting mixture increases from magnesium to barium.
Some float and some sink, they all react rapidly with cold water to release oxygen gas, forming acidic solutions.
41 exam-style questions on OCR GCSE Chemistry Predicting chemical reactions. Each one has a worked solution and a mark scheme showing where the marks go.