BRAINCAKEPeriod 3 Elements and Oxides
Revision notes for Period 3 Elements and Oxides in AQA Chemistry (7405). Read the start of any lesson here, then sign in free for the whole lesson, the R.E.C.I.P.E. recall steps and the quiz.
- Period 3 ElementsPeriod 3 is the third row of the Periodic Table: sodium, magnesium, aluminium, silicon, phosphorus, sulfur, chlorine and argon.
- Reactions of Sodium and Magnesium with WaterSodium reacts vigorously with cold water.
- Reactions of Period 3 Elements with OxygenThe Period 3 elements from sodium to sulfur all burn when heated in oxygen, forming an oxide.
- Period 3 OxidesThe oxides formed by the Period 3 elements are Na2O, MgO, Al2O3, SiO2, P4O10, SO2 and SO3.
- Melting Points of Period 3 OxidesThe melting points of the Period 3 oxides follow from their structure and bonding.
- Reactions of Period 3 Oxides with WaterWhen the Period 3 oxides are added to water, the metal oxides form hydroxides and the non-metal oxides form acids.
- pH of Period 3 Oxide SolutionsThe pH of the solution formed when each Period 3 oxide is added to water: • Na2O: pH 14 (strongly alkaline) • MgO: pH about 9 to 10 (weakly…
- Acid-Base Character of Period 3 OxidesAcross Period 3 the oxides change from basic, through amphoteric, to acidic.
- Amphoteric Aluminium OxideAn amphoteric oxide reacts with both acids and bases.
- Equations for Period 3 Oxides with Acids and BasesYou need to be able to write equations for the Period 3 oxides reacting with simple acids and bases.