4.1.2 Chemical Properties

• Alkaline earth metals react with water to form metal hydroxides and hydrogen
• Match the alkaline earth metal with its reactivity with water:

  Beryllium ↔️ No reaction

  Magnesium ↔️ Slow reaction

  Calcium ↔️ Moderate reaction

  Strontium ↔️ Strong reaction

  Barium ↔️ Very strong reaction
• The reactivity of alkaline earth metals with water increases down the group.
• Alkaline earth metals react with oxygen to form metal oxides
• Match the alkaline earth metal with its reactivity with oxygen:

  Beryllium ↔️ Slow reaction

  Magnesium ↔️ Burns brightly

  Calcium ↔️ Moderate reaction

  Strontium ↔️ Reactive

  Barium ↔️ Very reactive
• Barium reacts most vigorously with oxygen compared to other alkaline earth metals.
• Alkaline earth metals react with acids to form metal salts and hydrogen
• Match the alkaline earth metal with its reactivity with acids:

  Beryllium ↔️ Slow reaction

  Magnesium ↔️ Moderate reaction

  Calcium ↔️ Strong reaction

  Strontium ↔️ Very strong reaction

  Barium ↔️ Explosive reaction
• The increasing atomic size down the group leads to lower ionization energy, increasing reactivity with acids.
• Alkaline earth metals react with nitrogen to form metal nitrides
• Match the alkaline earth metal with its reactivity with nitrogen:

  Beryllium ↔️ No reaction

  Magnesium ↔️ Reacts when heated

  Calcium ↔️ Reacts slowly

  Strontium ↔️ Reacts more vigorously

  Barium ↔️ Reacts rapidly
• The reactivity of alkaline earth metals with nitrogen increases down the group due to decreasing ionization energies.
• What is the general reaction when alkaline earth metals react with water?

  Metal Hydroxide + Hydrogen
• Beryllium reacts with water even when heated.

  False
• Magnesium reacts slowly with hot water to form magnesium hydroxide and hydrogen
• Order the alkaline earth metals from least reactive to most reactive with cold water:

  1️⃣ Magnesium

  2️⃣ Calcium

  3️⃣ Strontium

  4️⃣ Barium
• What is the trend in reactivity of alkaline earth metals with water as you move down the group?

  Reactivity increases
• Match the alkaline earth metal with its reaction with oxygen:

  Beryllium ↔️ Forms thin oxide layer

  Magnesium ↔️ Burns brightly

  Calcium ↔️ Moderate reaction

  Strontium ↔️ Reactive

  Barium ↔️ Very reactive
• Beryllium forms a thick oxide layer on its surface when reacting with oxygen.

  False
• The reactivity of alkaline earth metals with oxygen increases down the group
• What type of gas is released when alkaline earth metals react with acids?

  Hydrogen
• Barium reacts explosively with acids due to its high ionization energy.

  False
• The reactivity of alkaline earth metals with acids increases down the group due to lower ionization energy
• Order the alkaline earth metals from least reactive to most reactive with nitrogen:

  1️⃣ Beryllium

  2️⃣ Magnesium

  3️⃣ Calcium

  4️⃣ Strontium

  5️⃣ Barium
• What is the trend in reactivity of alkaline earth metals with nitrogen as you move down the group?

  Reactivity increases
• Beryllium reacts with nitrogen to form beryllium nitride.

  False
• Match the compound type with its solubility trend down the group:

  Hydroxides ↔️ Increases

  Sulfates ↔️ Decreases
• For sulfates, the increase in hydration enthalpy is less significant than the increase in lattice enthalpy
• Why does the solubility of sulfates decrease down the group?

  Higher lattice enthalpy