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chem > topic 4b: halogens > Flashcards

topic 4b: halogens Flashcards

1
Q

f2 at room temperature

A

pale yellow gas

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2
Q

cl2 at room temperature

A

pale green gas

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3
Q

br2 at room temperature

A

red liquid with orange vapours

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4
Q

i2 at room temperature

A

grey solid
sublimes to purple gas

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5
Q

melting point and boiling point down group 7

A
  • INCREASES
  • more electrons
  • stronger london forces
  • more energy required to separate molecules
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6
Q

electronegativity down group 7

A
  • decreases
  • atomic radii increase
  • more shells, more shileding
  • greater distance from positive nucleus to electrons
  • weaker ESA
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7
Q

oxidising strength down group

A

DECREASES. ie fluroine is strongest oxidising agent

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8
Q

cl displaces

A

br and i

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9
Q

br displaces

A

i only

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10
Q

i displaces

A

NO ONE
- weakest oxidising agent

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11
Q

colour of solution when CHLORINE is displaced

A

colourless

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12
Q

colour of organic solvent when chlorine is displaced

A

colourless

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13
Q

colour of solution when bromine is displaced

A

yellow

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14
Q

colour of solution when iodine is displaced

A

brown solution

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15
Q

colour of orhanic solution when bromine dispalced

A

yellow

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16
Q

colour of organic solvent when iodine displaced

A

PURPLE

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17
Q

iodine oxidising power

A

WEAKEST

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18
Q

cl2 + h2o

A

hcl + hclo

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19
Q

chlorine with water tests

A
  • ## damp blue litmus / UI goes red (and then litmus bleached)
20
Q

cl2 + COLD DILUTE NaOH

A

nacl + naclo + h2o

21
Q

cl2 HOT CONCENTRATED NaOH

A

3cl2 + 6naoh = 5nacl + naclo3 +3h2o

22
Q

group 1 fluorides and chlorides + acid

A
  • acid base reaction
  • h2so4 not a strong enough oxidising agent
23
Q

reactions of group 1 halides + acids the halides act as

A

reducing agents therefore NaI is the strongest reducing agent

24
Q

effect of too much HClO

A
  • corrosive, toxic etc
25
Q

test for halide

A
  • nitric acid
  • silver nitrate
  • obserbe ppt
26
Q

purpose of adding nitric acid in the test for halides

A

react with any carbonates to prevent formation of silver carbonate ppt

27
Q

halid test : chrlodie

A

white ppt (agcl)

28
Q

halide test: bromide

A

cream ppt (AgBr)

29
Q

halide test: iodide

A

yellow ppt (AgI)

30
Q

AgCl + dilute ammonia

A

dissolves, colourless soludtion

31
Q

AgBR + dilute ammonia

A

nothing
in CONC ammonia, dissolves to form colourless solution

32
Q

hydrogen halide + ammonia

A

ammonium halide
white smoke

33
Q

NaCl + h2so4

A

= Na2SO4 + HCl

34
Q

NaF + H2SO4

A

= Na2SO4 (solid) + HF (gas)

35
Q

HX gas observation

A

steamy fumes

36
Q

NaBr + H2SO4

A
  • br- strong reducing agent
    1. 2NaBr + H2SO4 = Na2SO4 + 2HBr
    2. 2Hbr + H2SO4 = Br2 + SO2 + 2H2O
37
Q

NaI + H2SO4

A
  • I- strongest reducing agent
    1. NaI + H2SO4 = Na2SO4 + HI
    2. HI + H2SO4 = H2O + SO2 + I2
    3. 6HI + SO2 = H2S + 3I2 + 2H2O
38
Q

bromine issue

A

corrosive
wear gloves

39
Q

OVERALL NaBr + H2SO4

A

2NaBr + 2H2SO4 = Br2 + Na2SO4 + SO2 + 2H2O

40
Q

organic layer in the halide displacement

A

X2 dissolved in cyclohexane

41
Q

what type of reaction is NaCl or NaF and h2so4

A

ACID BASE
not redox as nothing changes oxidation state !!!!!!1

42
Q

agbr + CONC ammonia give the complex ion formula

A

Ag[NH3]2 +

43
Q

agno3 + f2

A

no observation as AgF is soluble

44
Q

in a separating funnel, the organic layer is

A

ON TOP
aqueous layer underneath

45
Q

hydrogen halides solubility

chem (29 decks)

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