Chemistry 9701/22 — May/June 2018
Cambridge AS Level · AS Level Structured Questions · worked solutions for every part, with the mark scheme
Topics Chemical Bonding · Atoms, Molecules and Stoichiometry · Group 2 · Equilibria · Electrochemistry · Hydrocarbons · +4 more
Sodium and magnesium are the first two elements in the third period.
Sodium and magnesium both react with cold water to produce the same type of product in solution. With sodium the solution is clear but with magnesium it appears cloudy.
Write an equation for the reaction of magnesium with cold water.
Suggest why the solution is cloudy after the reaction of magnesium with cold water.
Group 2 elements, including magnesium, react with oxygen and with dilute acids. There are trends in both the physical and chemical properties of the elements and their compounds down the group. Reactivity generally increases from Mg to Ba.
Explain why there is a general increase in reactivity from Mg to Ba.
Give two observations for the reaction of magnesium with oxygen. Write an equation for this reaction. Include state symbols.
Write an equation for the reaction of magnesium with sulfuric acid.
Suggest why there is a general decrease in the melting points of the elements down Group 2.
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