ES 1-Halogens

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  • Created by: anabob
  • Created on: 18-01-18 20:07
which group are the halogens?
group 7
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are halogens naturally found in elemental form?
no, in compunds like calcium fluoride
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how are they found in elemental form?
in diatomic molecules linked by a single covalent bond
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whats the difference between a halogen and a halide?
halogens- elemental, halides- ions/salts
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whats the appearance of the first four halogens?
F2- pale yellow gas, Cl2- green gas, Br2- dark red volatile liquid, I2- grey solid
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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
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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
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when dissolved in cyclohexane, what colour are cl2, br2 and I2?
cl2 is pale green, br2 is orange and I2 is violet
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why are the halogens reactive?
because they have 7 outer electrons so gain an electron easily
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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
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how do you write an ionic equation?
remove unchnaged spectator ions
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whats an oxidising and reducing agent?
reducing agent is oxidised, oxidsing agent is reduced
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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
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what's a displacement reaction?
when a (halogen) pushes out a less reactive halogen from a compound
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what can be added to reactions involving halogens to make colour chnages more distinct?
an organic solvent
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what are the colours of the silver halides?
AgCl is white, AgBr is cream, AgI is pale yellow
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how can you distinguish between silver halides? What is formed?
adding ammonia solution. AgCl is soluble, AgBr is partially soluble, AgI is insoluble
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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)
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what is the charge of group 7 ions?
-1
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Card 2

Front

are halogens naturally found in elemental form?

Back

no, in compunds like calcium fluoride

Card 3

Front

how are they found in elemental form?

Back

Preview of the front of card 3

Card 4

Front

whats the difference between a halogen and a halide?

Back

Preview of the front of card 4

Card 5

Front

whats the appearance of the first four halogens?

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