There are lots of random reactions in AQA A level chemistry that appear throughout the course, which could come up in your exams. Whilst it's not essential to have all of these equations memorised, being familiar with these equations will surely have a great impact on your performance, allowing you...
Inorganic Chemistry
Reactions of Group 2 Elements with Water
• Mg + H2O ! MgO + H2 (with steam)
• Mg + 2H2O ! Mg(OH)2 + H2 (with warm water)
• Ca + 2H2O ! Ca(OH)2 + H2
• Sr + 2H2O ! Sr(OH)2 + H2
• Ba + 2H2O ! Ba(OH)2 + H2
Uses of Group 2 Elements
• TiCl4 (g) + 2Mg (l) ! Ti (s) + 2MgCl2 (l) (Extraction of titanium with magnesium)
• Mg(OH)2 + 2HCl ! MgCl2 + 2H2O (Magnesium hydroxide in medicine)
• Ca(OH)2 + CO2 ! CaCO3 + H2O (Limewater testing for CO2)
• CaO (s) + 2H2O (l) + SO2 (g) ! CaSO3 (s) + 2H2O (l) (Removing SO2 with CaO)
• CaCO3 (s) + 2H2O (l) + SO2 (g) ! CaSO3 (s) + 2H2O (l) + CO2 (g) (Removing SO2 with CaCO3)
Reactions of Group 7 Elements with Sulfuric Acid
• NaCl (s) + H2SO4 (l) ! NaHSO4 (s) + HCl (g) (white misty HCl fumes)
Reactions of Period 3 Elements with Oxygen
• 4 Na + O2 ! 2 Na2O (yellow flame, white solid, vigorous)
• 2 Mg + O2 ! 2 MgO (white flame, white solid, vigorous)
• 4 Al + 3 O2 ! 2 Al2O3 (white flame, white solid, slow)
• Si + O2 ! SiO2 (white flame, white solid, slow)
• P4 + 5 O2 ! P4O10 (white flame, white solid, spontaneously combusts)
• S + O2 ! SO2 (pale blue flame, colourless gas, burns steadily)
• 2 S + 3 O2 ! 2 SO3 (pale blue flame, colourless gas, burns steadily)
Reactions of Period 3 Oxides with Water
• Na2O + H2O ! 2 NaOH (NaOH strong base)
• MgO + H2O ! Mg(OH)2 (Mg(OH)2 sparingly soluble)
• P4O10 + 6 H2O ! 4 H3PO4 (H3PO4 weak acid with many H+ ions)
• SO2 + H2O ! H2SO3 (H2SO3 weak acid)
• SO3 + H2O ! H2SO4 (H2SO4 strong acid)
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