Aqa A-Level Chemistry: Group 2 Study Guide Rated A+

Reactivity with water down the group {Ans: Increases. This is because the ionisation energy decreases so there are more molecules with enough energy for a successful reaction due to increased successful collisions}When an element from group 2 reacts with liquid water: {Ans: X + 2H2O -> X(OH)2 + H2}Melting point {Ans: Decreases. Trend in melting point down the group. This is because the delocalised electrons are further from the nucleus as the atomic radius increases}How long it takes for pure titanium to be extracted? {Ans: 2 - 3 days}Uses of Mg(OH)2 {Ans: Laxatives and Antacids}Atomic Radius {Ans: Increases. Trend in atomic radius down the group. This trend is due to more orbitals and a weaker nuclear charge as the charge is offset by the shielding that has come about from more orbitals}Use of Ca(OH)2 {Ans: Neutralise Soil}What do you add to the solution before adding BaCl2 to ensure that no CO2 is formed? {Ans: HCl}Trend in solubility of sulphates going down the group {Ans: Decreases}How to test for sulphate ions {Ans: BaCl2}Uses of BaSO4, this is due to its insolubility, despite its toxicity {Ans: X-Rays and GI Tract}Reactivity