ES 1-Halogens 0.0 / 5 ? ChemistryThe Periodic TableASOCR Created by: anabobCreated on: 18-01-18 20:07 which group are the halogens? group 7 1 of 19 are halogens naturally found in elemental form? no, in compunds like calcium fluoride 2 of 19 how are they found in elemental form? in diatomic molecules linked by a single covalent bond 3 of 19 whats the difference between a halogen and a halide? halogens- elemental, halides- ions/salts 4 of 19 whats the appearance of the first four halogens? F2- pale yellow gas, Cl2- green gas, Br2- dark red volatile liquid, I2- grey solid 5 of 19 what are four properties that occur as you go down group 7? _darker in colour _increase in boiling/melting point_changes from gas to liquid to solid_becomes less volatile 6 of 19 how does the halogen solubility change down group 7? there's no trend, but all halogens are more soluble in organic solvents than in water 7 of 19 when dissolved in cyclohexane, what colour are cl2, br2 and I2? cl2 is pale green, br2 is orange and I2 is violet 8 of 19 why are the halogens reactive? because they have 7 outer electrons so gain an electron easily 9 of 19 why is fluorine the most reactive halogen/strongest oxidising agent? because its a small atom so theres a strong attraction between additional electrons and the positive nucleus as theres less shielding 10 of 19 how do you write an ionic equation? remove unchnaged spectator ions 11 of 19 whats an oxidising and reducing agent? reducing agent is oxidised, oxidsing agent is reduced 12 of 19 how do you write a half equation? one equation shows a species gaining electrons (reduced) X + e-> X- the other shows a species losing electrons (oxidised) X- > e +X 13 of 19 what's a displacement reaction? when a (halogen) pushes out a less reactive halogen from a compound 14 of 19 what can be added to reactions involving halogens to make colour chnages more distinct? an organic solvent 15 of 19 what are the colours of the silver halides? AgCl is white, AgBr is cream, AgI is pale yellow 16 of 19 how can you distinguish between silver halides? What is formed? adding ammonia solution. AgCl is soluble, AgBr is partially soluble, AgI is insoluble 17 of 19 whats the general equation for the reaction when a solution of silver ions is added to a solution containing the halides? Ag+ (aq) + X- (aq) ---> AgX (s) 18 of 19 what is the charge of group 7 ions? -1 19 of 19
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