The reactions of Group 2 elements with oxygen and water

AIM    Describe the reactions of Group 2 elements with oxygen and with water and explain the trend in reactivity

The Group 2 elements are reactive metals. They react with oxygen and water as follows:

    METAL + OXYGEN = METAL OXIDE

    METAL + WATER = METAL HYDROXIDE + HYDROGEN

    METAL + STEAM = METAL OXIDE + HYDROGEN

     Video - The reaction of magnesium with oxygen

     Video - The reaction of calcium with water

   Video - The reaction of magnesium with steam

QUESTIONS

1    Give the key observations (what do you see?) during each of the reactions.

2    Write word and symbol equations, including state symbols, for each of the reactions.

3    Explain why the reactions are described as redox reactions.

4    Which is the more reactive element - magnesium or calcium? Explain your choice using experimental observations.

5    Calcium oxide reacts with water to from calcium hydroxide. Calcium hydroxide is not very soluble in water.

    (a)    Write and equation for the reaction between calcium oxide and water.

    (b)    Give two properties of calcium hydroxide solution.