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
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.