Chemistry 9701 · AS & A Level · Group 2

Group 2 — practice question

The table shows some data for compounds of two elements in Group 2 of the Periodic Table. Calcium compounds: - decomposition temperature of carbonate: $840\ ^\circ\text{C}$ - solubility of sulfate: $4.66 \times 10^{-3}\ \text{mol / 100 g of water}$ - solubility of hydroxide: $1.53 \times 10^{-3}\ \text{mol / 100 g of water}$ Element Z: - decomposition temperature of carbonate: $?$ - solubility of sulfate: $?$ - solubility of hydroxide: $2.00 \times 10^{-5}\ \text{mol / 100 g of water}$ What are the missing values for element Z?

  • Adecomposition temperature $350\ ^\circ\text{C}$; solubility of sulfate $1.83 \times 10^{-1}$
  • Bdecomposition temperature $350\ ^\circ\text{C}$; solubility of sulfate $7.11 \times 10^{-5}$
  • Cdecomposition temperature $1100\ ^\circ\text{C}$; solubility of sulfate $1.83 \times 10^{-1}$
  • Ddecomposition temperature $1100\ ^\circ\text{C}$; solubility of sulfate $7.11 \times 10^{-5}$

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