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chemistry > group 2 and 7 > Flashcards

group 2 and 7 Flashcards

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1
Q

what is a reducing agent ?

A

electron donor

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2
Q

what is the trend in reducing strength of halides ?

A

increases down the group because ionic radius increases therefore weaker attraction between outer electron and nucleus

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3
Q

which halides undergo redox reactions with h2so4 ?

A

bromine
iodine

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4
Q

br- is strong enough to reduce h2so4 into …

A

so2

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5
Q

I- is strong enough to reduce h2so4 into

A

so2
s
h2s

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6
Q

what is are the observations of the following

so2
s
h2s

A

acidic gas
yellow solid
bad egg smell

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7
Q

what is the observation of I2 in redox reaction

A

black solid

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8
Q

What is the observation of Br2 in redox reaction

A

brown fumes

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9
Q

Balance the half equation

h2so4 -> so2

A

2e- + 2h+ + h2s04-> so2 +2h20

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10
Q

balance the half equation

h2so4 -> s

A

6e- + 6h+ + h2so4 -> s + 4h20

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11
Q

balance the half equation

h2so4 -> h2s

A

6e- + 6h+ h2so4 -> h2s + 4h2o

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12
Q

which halides undergo acid base reactions ?

A

F
Cl
Br
I

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13
Q

Give The general formula for a acid base reaction with a halide.

A

h2so4 + NaX -> Nahso4 + hX

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14
Q

what are the observations for HF and HCl

A

misty fumes

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15
Q

why is nitric acid added before the test for halide tests

A

to remove carbonate impurities which would give false positive

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16
Q

What is the observation for each halide test ?

A

F no precipitate
Cl white precipitate
Br cream precipitate
I yellow precipitate

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17
Q

what is a precipitate ?

A

when 2 solutions react to form a solid

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18
Q

how would you distinguish between Br Cl I

A

add dilute nh3 and cl precipitate will dissolve
add conc nh3 and Br precipitate will dissolve
I precipitate remains

19
Q

what is the general formula for the precipitates formed in halide tests ?

A

AgX

20
Q

what solution is added to test for halides

A

Silver nitrate (AgNO3)

21
Q

what is a oxidising agent ?

A

electron acceptor

22
Q

what is the trend in oxidising ability in halogens

A

decreases down the group because radius increases therefore weaker attraction between nucleus and incoming electrons

23
Q

what is the difference between a halide and a halogen ?

A

Halide is a group 7 ion
halogen is a group 7 atom (diatomic)

24
Q

what can displace I ?

A

Cl
Br

25
Q

what’s the ionic equation for the displacement of I by Cl

A

Cl2 + 2I- -> 2Cl- + I2

26
Q

what is the observation for Br2 in displacement reaction ?

A

orange solution

27
Q

what is the observation for I2 in displacement reaction ?

A

Black solid

28
Q

what are the uses for chlorine

A

to kill bacteria in water
production of bleach

29
Q

why is chlorine added to water in low concentrations ?

A

Its toxic

30
Q

what is the equation for prodution of bleach with cold dilute aqueous sodium hydroxide ?

A

Cl2 + 2NaOH -> NaCl + NaClO(Bleach) + H2O

31
Q

what is the trend in reactivity for group 2 ?

A

increases down the group

32
Q

What is the observation for the reaction of Mg with steam ?

A

White solid (MgO)
bright light

33
Q

what is used to extract Ti from TiCl4 ?

A

magnesium

34
Q

What is the trend i solubility of group 2 hydroxides ?

A

Increases down the group

35
Q

What is the test for Mg2+ ions ?

A

add Sodium hydroxide to form a white precipitate

36
Q

what is the test for OH- ions ?

A

add magnesium nitrate to from white precipitate

37
Q

what are the uses of magnesium hydroxide ?

A

indigestion relief

38
Q

what is the trend of solubility in group 2 sulphates ?

A

decreases down the group

39
Q

what is the test for Ba2+ ions ?

A

add H2SO4 which forms a white precipitate

40
Q

what is the test for sulphate ions ?

A

Add Barium chloride which forms a white precipitate

41
Q

what is the test for carbonate ions ?

A

add any acid which forms a effervescence

42
Q

what are the uses for barium sulphate ?

A

Taking x rays of the stomach

43
Q

why is it okay to consume barium sulphate although it is toxic ?

A

It is insoluble

chemistry (17 decks)

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