a. i. The Group 1 metal lithium reacts in a similar way to sodium. It reacts with oxygen, producing lithium oxide. Write the balanced symbol equation, including state symbols, for this reaction.

ii. Lithium also reacts with chlorine. Write the balanced symbol equation, including state symbols, for this reaction.

b. i. The Group 2 metal calcium reacts more vigorously with cold water than magnesium does, forming an alkaline solution. Write the balanced symbol equation, including state symbols, for this reaction.

ii. The solution formed when 0.01mol of calcium react completely with 1 dm³ of water is more alkaline than the solution formed when 0.01mol of magnesium react completely with 1dm³ of water. Explain why.