Trends in period 3 0.0 / 5 ? ChemistryTransition metalsA2/A-levelAQA Created by: jamey_brewsterCreated on: 28-03-19 11:14 What is the trend in melting points of period 3 oxides? * MgO>Al2O3>SiO2>Na2O>P4O10>SO3>SO2 1 of 6 What is the pH of NaOH compared to Mg(OH)2? NaOH = 14, Mg(OH)2 = 9 (magnesium oxide is sparingly soluble). 2 of 6 Why is NaOH(aq) strongly alkaline? It contains the oxide ion (O2-) which is a very strong base and so readily accepts H+ from water to produce hydroxide ions. 3 of 6 Why is Al2O3 insoluble? * Its bonding has covalent character, so is too strong for the ions to be separated. 4 of 6 Why is SiO2 insoluble? It has a macromolecular structure, with strong covalent bonds between all atoms. 5 of 6 What is produced when a period 3 oxide reacts with an acid/base? A salt + water 6 of 6
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