Group 2: Reactions, Solubility and Thermal StabilitySign up
understand reasons for the trend in ionisation energy down Groups 1 and 2 · understand reasons for the trend in reactivity of the elements down Group 1 (Li to K) and Group 2 (Mg to Ba) · know the reactions of the elements of Group 1 (Li to K) and Group 2 (Mg to Ba) with oxygen, chlorine and water · know the reactions of: (i) oxides of Group 1 and 2 elements with water and dilute acid; (ii) hydroxides of Group 1 and 2 elements with dilute acid · know the trends in solubility of the hydroxides and sulfates of Group 2 elements · understand the reasons for the trends in thermal stability of the nitrates and the carbonates of the elements in Groups 1 and 2 in terms of the size and charge of the cations involved · understand the formation of characteristic flame colours by Group 1 and 2 compounds in terms of electron transitions (students will be expected to know the flame colours for Group 1 and 2 compounds) · know experimental procedures to show: (i) patterns in the thermal decomposition of Group 1 and 2 nitrates and carbonates (students will be expected to know tests for carbon dioxide and oxygen; and to recognise nitrogen dioxide by its colour and acidic pH); (ii) flame colours in compounds of Group 1 and 2 elements · know reactions, including ionic equations where appropriate, for identifying: (i) carbonate ions, CO3^2-, and hydrogencarbonate ions, HCO3^-, using an aqueous acid to form carbon dioxide (and testing the gas with limewater); (ii) sulfate ions, SO4^2-, using acidified barium chloride solution; (iii) ammonium ions, NH4+, using sodium hydroxide solution and warming to form ammonia (and testing with litmus and HCl fumes)
