Group 2

• What is the trend in melting points in group 2 and why?

  Decreases from Ca due to weaker attraction between cations and delocalised electrons

  Mg is the exceptions and has the lowest melting point
• What is the trend in ionisation energy down Period 2?

  Decreases due to increased shielding- less electrostatic attraction between cations and delocalised electrons
• What is the trend in atomic radius down a group? Why?

  Increases. Due to additional electron shells being added, leading to increased distance between the nucleus and outer electrons.
• What is the Trend fro atomic radius in Group 2? Why?

  Increases Shielding effect
• What is the trend in reactivity going down group 2?

  Increases as it becomes easier to remove outer electrons as atomic radius increases
• When Group 2 metals react with water, what are the products?

  Metal Hydroxide and Hydrogen
• Write the equation for Mg reacting with Steam

  Mg + H2O ---> MgO + H2
• What is the trend in solubility of the hydroxides down group 2?

  Increases
• What is the trend of pH in the Group 2 Hydroxides as you go down the group?

  Increases
• Which is the least soluble group 2 Hydroxide?

  Magnesium Hydroxide
• What is the practical application of Magnesium Hydroxide?

  Milk of Magnesia - an indigestion remedy
• What is the practical application of Calcium Hydroxide?

  Used in agriculture to raise the pH of Soil
• What is another name for Calcium Hydroxide?

  Slaked lime
• What is the trends in solubility of Group 2 Sulphates as you move down the group?

  Decreases
• How can you test for sulphate ions?

  Add Barium chloride solution.
• What will a positive test for sulphate look like?

  A white ppt of Barium sulphate is produced
• What is the practical application of Barium sulphate?

  Can be used in X-Rays and is given to patients as a barium meal
• Why is Barium sulphate safe to be ingested in the body despite its toxicity?

  It is insoluble
• What is the overall equation for Titanium extraction?

  TiCl4 + 2Mg → Ti + 2MgCl2