Chemistry- General Quiz 0.0 / 5 ? ChemistryAcids, bases and saltsAtoms and compoundsStructure and bondingTesting and analysing substancesIGCSEEdexcel Created by: tasha_0803Created on: 06-04-15 14:39 What is the general formula for alkanes? CnH2n+2 1 of 17 Isotopes have a different number of what? Neutrons 2 of 17 The relative mass of an electron is what? 1/2000 3 of 17 In group 1, how does the reactivity change as you go down the group? It increases 4 of 17 Metals that are more reactive than carbon are extracted in what way? Electrolysis 5 of 17 In a flame test, Lithium burns with which colour flame? Red 6 of 17 When adding sodium hydroxide solution, Copper forms a what colour precipitate? Blue 7 of 17 The two conditions/elements needed for rust are what? Water and oxygen 8 of 17 Acid+base--->??? Salt + water 9 of 17 Which structure conducts electricity when molten or dissolved? Giant ionic 10 of 17 What is the name of the ore in which aluminium is found? Bauxite 11 of 17 Why is cryolite added in the extraction of aluminium? It lowers the melting point 12 of 17 What are the three raw materials in the blast furnace? Iron oxide, coke, limestone 13 of 17 Moles= ??? Mass/ Mr 14 of 17 Phenolphthalein is what colour in acids? Colourless 15 of 17 In the excess solid method, you need what type of base and an acid? Insoluble 16 of 17 Concentration=??? Moles/volume 17 of 17
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