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Chemistry may mock (mine) > paper 2 questions > Flashcards

paper 2 questions Flashcards

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1
Q

what is the reaction mechanism when Ethan and chlorine react in UV light

A

free radical substitution

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2
Q

what is the name of this alkane

A

4-ethyl-3-methylheptane

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3
Q

explain why different alkanes in crude oil can be separated by fractional distillation

A

different alkanes have different boiling points because of different chain lengths

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4
Q

complete the equation

C8H18 >

A

C8H18>C2H4+C6H14

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5
Q

write the equation using displayed formula

A

c6h14 >c6h12 (circle) + h2

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6
Q

which of these has the formula c6h10

A

c

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7
Q

what is the systematic name of this alkene

A

c 2,3dimethylbut-1-ene

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8
Q

two reactions of ethene are shown complete the table

A

1 product > c2h5br

2 condition> steam and acid

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9
Q

draw the structure of the polymer formed

h h
|   |
c=c 
|.   |
h  ch2ch3
A

picture

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10
Q

calculate the number of molecules in 70g of but-1-ene

A

moles=mass/ram
70/56=1.25
1.25 x avagragdros

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11
Q

the skeletal formulae of four organic compound are shown which can be hydrolysed to form methanol

A

compound q

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12
Q

the skeletal formulae of four organic compound are shown which produces co2 when it reacts with sodium hydrogen carbonate

A

compound p

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13
Q

describe the structures of compound t u v justify your answers

A

picture

  • u is a ketone because it gives an orange precipitate with Bradys and doesn’t give a precipitate with feelings
  • t is a secondary alcohol because it was oxidised to a ketone
  • v is an ester as alcohol react with acyl chlorides to for esters
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14
Q

complete the reaction for the reaction of phenol with excess bromine water

A

add picture

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15
Q

compare and contrast the bromination of phenol with the bromination of benzene

A
  • both undergo electrophilic substitution
  • no need for a halogen carrier with phenol
  • oxygens lone pair of electrons interacts with the benzene ring of delocalised electrons so electrophilic attack is more likely
  • tri substitution of phenol compared to mono for benzene
  • phenol requires bromine in aqueous solution and room temp but benzene requires liquid bromine and heating under reflux
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16
Q

mechanism for no2+ and phenol to produce 4-nnitrophenol

A

add picture (mechanism book)

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17
Q

what is the mass in grams from 0.94g if the yield is 15%

A

0.21 (B)

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18
Q

draw 2 structural isomers of 4-nitrophenol which have a benzene ring

A

add pic ( put in book)

19
Q

draw a section of each polymer showing 2 repeat units

A

add picture and in book

20
Q

deduce the two monomers needed to produce the polyamide

A

HOOC-(CH2)4-COOH
and
H2N-(CH2)4-NH2

21
Q

deduce the single monomer that could produce the polyamide shown

A

H2N-(CH2)4-NH2

22
Q

draw the enantiomers of 2-hydroxypropanoic acid

A

add pictures

23
Q

state how separate samples of these two enantiomers could be distinguished in a labatory

A

they rotate the plane of plane polarised light equally and in opposite directions

24
Q

the reaction of ethane and chlorine in the uv radiation produces chloroethane this reaction is classified as

A

substitution

25
Q

the black smoke produced from the incomplete combustion of alkane fuels is

A

carbon particulates

26
Q

a reaction of hexane is shown below this is best described as

A

reforming

27
Q

the skeletal formula of declin is

A

c10h18 (c)

28
Q

explain the trend in reactivity of the iodoalkanes

A

reactivity increases down group 7 because the c-x bond enthalpy decreases

29
Q

write the mechanism for the reaction of sodium hydroxide and 1 bromoethane

A

add picture in mechanism book

30
Q

give the reagents that are used to test that bromide ions are formed in the reaction mixture

A

nitric acid and silver nitrate (solution) positive result is a cream/ off where percipitate

31
Q

draw the skeletal formula of all the alkanes that can be produced

A

picture

32
Q

explain why ethene has a boiling point of 104 where as ethanol has 78

A
  • only ethanol has hydrogen bonding (as well as DD +LF)
  • ethene only as London forces
  • more energy is required to break the stronger IMF
33
Q

balance the ionic half equation for the reduction of dichromate

A

14,6,2,7,

orange, colourless, green colourless

34
Q

state how the granules prevent bumping

A

they provide a surface for bubbles to form so distribute the heat more evenly

35
Q

which alcohol would be oxidised under reflux to produce this carboxylic acid

A

2-methylpropan-1ol

36
Q

using the apparatus for distillation instead of reflux is not effecient. why?

A

ethanol would be oxidised to ethanal because ethanal has a low boiling temperature so would distil before ethanoic acid can be formed

37
Q

which of these represent a non cyclic hydrocarbon

A

c6h14 (d)

38
Q

how many structural isomers are there with the molecular formula c5h12

A

3 (B)

39
Q

how many pi and sigma bonds are there in one molecule of cyclohexane

A

16 sigma 1 pi (D)

40
Q

what is the increase in the total volume when 100cm3 of ethane is burned

A

50 (A)

41
Q

suggest the identity of the cyclic hydrocarbon by calculating the molecular formula

A

vol of co2=125
x=125/25=5
(25+25(5+y/4)-75=125
y=8

42
Q

draw the mechanism for the reaction between propene and iodine monochloride to form the major product

A

picture + mechanism book

43
Q

calculate the % by mass of the limonene oil

A 
moles br2 = (30.6 x0.2)/1000
mol of limo 0.00612/2=0.00306
mass of limo =136
oil= 0.00306x136=0.41616
0.41616/0.5 x 100=83.2%

Chemistry may mock (mine) (3 decks)

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