Chemistry C8 (Chemical Analysis) 0.0 / 5 ? ChemistryAnalysing substancesGCSEAQA Created by: julian hayterCreated on: 17-01-22 17:00 What is a pure substance? a single element or compound, not mixed with any other substance. 1 of 38 How do pure substances melt/boil? at specific temperatures 2 of 38 In everyday language, what can a pure substance mean? a substance that has had nothing added to it 3 of 38 What is a formulation? a mixture that has been designed as a useful product 4 of 38 How are formulations made? By mixing components in carefully measured quantities (so product has required properties) 5 of 38 What are examples of formulations? fuels, cleaning agents, paints, medicines, alloys, fertilisers and foods 6 of 38 Which type of separation method can be used to separate mixtures to help identify substances chromatography 7 of 38 What 2 phases does chromatography involve? stationary and mobile phases 8 of 38 How can the Rf value be calculated? distance moved by substance/ distance moved by solvent 9 of 38 What type of compound will produce a single spot in all solvents pure 10 of 38 How do you test for hydrogen? squeaky pop from burning splint 11 of 38 How do you test for oxygen? glowing splint relights 12 of 38 How do you test for CO2? limewater (calcium hydroxide) goes milky (cloudy) 13 of 38 How do you test for chlorine? damp litmus paper bleaches and turns white 14 of 38 What can flame tests be used to produce distinctive colours of? metal ions 15 of 38 What colour flame does lithium compounds go to? crimson 16 of 38 What colour flame does sodium compounds go to? yellow 17 of 38 What colour flame does potassium compounds go to? lilac 18 of 38 What colour flame does calcium compounds go to? orange-red 19 of 38 What colour flame does copper compounds go to? green 20 of 38 what solution can be used to identify positive ions? sodium hydroxide (NaOH) 21 of 38 what colour precipitate is formed for magnesium, aluminium and calcium ions in NaOH? white 22 of 38 which ion dissolves in excess NaOH? aluminium 23 of 38 what colour precipitate is formed by copper from NaOH? blue 24 of 38 what colour precipitate is formed by iron(ll) from NaOH? green 25 of 38 what colour precipitate is formed by iron(lll) from NaOH? brown 26 of 38 what do carbonates react with to from CO2? dilute acids 27 of 38 how can CO2 be identified? if limewater goes milky 28 of 38 what charge to halide ions have? - (negative) 29 of 38 what 2 solutions are needed for halide ions to be identified? silver nitrate solution and dilute nitric acid 30 of 38 what colour are chlorides? white 31 of 38 what colour are bromides? cream 32 of 38 what colour are iodides? yellow 33 of 38 what 2 solutions are needed for sulfate ions to be identified? dilute hydrochloric acid and barium chloride solution 34 of 38 what colour precipitate is produced from sulfate ions in solution? white 35 of 38 what sort of methods can elements and compounds be identified by? Instrumental methods 36 of 38 what are instrumental methods like? accurate, sensitive and rapid 37 of 38 what is an example of an instrumental method used to analyse metal ions? Flame emission spectroscopy 38 of 38
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