physical properties Flashcards

1
Q

what do halogens exist as?

A

diatomic molecules

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2
Q

state the appearances of F, Cl, Br and I at room temp

A

F = pale yellow gas
Cl = pale green gas
Br = brown liquid
I = grey solid which sublimes to purple vapor

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3
Q

describe the trend in boiling point down the group

A
  • increases
  • atomic radius and relative mass increase
  • so london forces are stronger so more energy required
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4
Q

describe the trend in electronegativity down the group

A
  • decreases
  • atomic radius and shielding increase
  • so nuclear attraction decreases and electrons are less easily gained
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5
Q

describe the trend in reactivity down the group

A
  • decreases
  • atomic radius increases
  • nuclear attraction decreases
  • electrons less easily attracted
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6
Q

what does the reactivity trend of halogens mean in terms of displacement?

A
  • more reactive halogens displace less reactive halides
  • halogens are less easily oxidised down the group so they displace halides LOWER DOWN
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