Group 2 elements share common chemical properties.

1. (a)(i)Calcium reacts in cold water more quickly than magnesium because more energy is required to remove the outer electrons in magnesium. This occurs even though calcium atoms have a greater nuclear charge. Explain why more energy is required to remove the outer electrons in magnesium than in calcium.[2]
2. (a)(ii)0.001 mol of strontium reacts with an excess of cold water. When the reaction is complete a colourless solution is seen. Construct the equation for the reaction of strontium with cold water. Include state symbols.[2]
3. (a)(iii)0.005 mol of calcium and 0.005 mol of strontium are added separately to two beakers. Each beaker contains 100 cm³ of cold water. At the end of each reaction a white solid and a colourless solution are seen in both beakers. Predict which element, calcium or strontium, produces the more alkaline solution. Explain your answer.[2]
4. (a)(iv)Describe one observation when magnesium carbonate is added to excess dilute sulfuric acid.[1]
5. (b)(i)From the information given, state two similarities and one difference that metal X and its compounds have with Group 2 metals and their compounds.[3]
6. (b)(ii)Write the formula of the oxide of X.[1]
7. (b)(iii)Write an equation for the reaction of XCO3 when it is heated.[1]