Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

AL Chemistry (Edexcel) 2024 MT > TOPIC 6 - Organic chemistry I > Flashcards

TOPIC 6 - Organic chemistry I Flashcards

You may prefer our related Brainscape-certified flashcards:
AP® Chemistry flashcards Periodic Table flashcards Chemistry 101 flashcards Organic Chemistry 101 flashcards
1
Q

What is a general formula?

A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What is the general formula for alkanes?

A

CnH2n+2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What is the general formula for alkenes?

A

CnH2n

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What is the general formula for alcohols?

A

CnH2n+1OH

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What is the molecular formula?

A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What is the empirical formula?

A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What is the structural formula?

A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is the skeletal formula?

A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What is the displayed formula?

A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What is a homologous series?

A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What is the functional group for alkenes?

A

C=C

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What is the functional group for alcohol?

A

-OH

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What is the functional group for an aldehyde?

A

R-C=O

(double bond with oxygen at the end of the carbon chain)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What is the functional group for ketones?

A

Double bond with oxygen in the middle of te carbon chain.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What is the functional group for carboxylic acids?

A

COOH

(double bond with O and single bond with OH)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What is the formula for cyclopentane?

A

C5H10

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What is a polymerisation reaction?

A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

What is a hydrolysis reaction?

A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

What is an elimination reaction?

A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

What is an addition reaction?

A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

What is a substitution reaction?

A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

What does a curly arrow in a mechanism show?

A

The movement of a pair of electrons

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

What is the mechanism for the reaction of OH- with bromoethane?

A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

What type of reaction is this?

A

Nucleophilic substitution

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

What is heterolytic fission?

A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

What is homolytic fission?

A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

What is the initiation step of this reaction?

A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

What is the propagation step of this reaction?

A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

What is the termination step for this reaction?

A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

Can we make only chloromethane with free radical substitution of chlorine with methane?

A

No. The chain reaction will keep going and di- and trichloromethane can be formed apart from chloromethane.

However adding excess methane can help to get just chloromethane.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
31
Q

How is crude oil separated using fractional distillation?

Give the range of temps used.

A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
32
Q

What is the use of the gas (shorter) fraction?

A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
33
Q

What is the use of the petrol fraction?

A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
34
Q

What is the use of the kerosene?

A

*Kerosene*

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
35
Q

What is the use of diesel oil?

A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
36
Q

What is the use of fuel oil?

A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
37
Q

What is the use of bitumen?

A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
38
Q

Why do we use cracking?

A

Larger fractions are broken into lighter, more demanded fractions.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
39
Q

What are the conditions for thermal cracking?

A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
40
Q

What type of products does thermal cracking produce?

A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
41
Q

What are the conditions for catalytic cracking?

A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
42
Q

What are the typical products of catalytic cracking?

A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
43
Q

What are the advantages of catalytic cracking?

A

Lowers temperature and pressure needed.

Lowers the cost and speeds up the reaction.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
44
Q

Why are alkanes reformed?

A

To avoid knocking, which is when straight chain alkanes explode upon compression. This reduces the efficiency of the engine. Therefore they are turned into branched and cyclic alkanes to increase the efficiency.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
45
Q

What are the conditions for reforming alkanes?

A

Platinum catalyst (Pt)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
46
Q

How does burning hydrocarbons cause acid rain?

A
  • Sulfur impurities are burnt and so SO2 is produced. The sulfur dioxide then reacts with water in the atmosphere to create sulfuric acid.
  • Nitrogen and oxygen react in the high temp/pressure inside the engine and create NOx which then reacts with water in the atmosphere to create nitric acid.
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
47
Q

Why is there E/Z isomerism in some alkenes?

A

Atoms can’t rotate around the carbon double bond.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
48
Q

What do the CIP rules say to naming geometrical isomers?

A

Take into account the groups whose first element directly bonded to the carbon has the highest atomic number.

If they are the same, take into account the next element.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
49
Q

What does E mean in geometrical isomerism?

A

The groups are in different sides (trans)

50
Q

What does Z mean in geometrical isomerism?

A

The groups are in the same side (cis)

51
Q

What is an electrophile?

A

An electron pair acceptor, a species that lacks electrons.

52
Q

What is the generic mechanism for the electrophilic addition of to alkenes?

A
53
Q

What are the conditions for the addition of hydrogen (hydrogenation/saturation) of alkenes?

A

150ºC and Nickel catalyst.

54
Q

What is the test for alkenes?

A

Add bromine water to alkene. If the alkene is present, the mixture should turn from brown-orange to colourless.

55
Q

What is the mechanism for the addition of bromine to alkenes?

A
56
Q

What is the product for the hydration of alkenes?

A

Alcohols

57
Q

What are the conditions for the hydration of alkenes?

A

Steam+alkene.

Phosphoric acid catalyst.

300ºC and 60atm.

58
Q

Is the yield high for the hydration of alkenes?

A

At first no, the reaction is reversible with a yield of 5%. However the alkene is recycled and the overall yield is 90-95%.

59
Q

What is the product of an alkene with acidified potassium manganate?

A

Alcohol (diol)

60
Q

What is the colour change for the oxidation of alkenes into diols using acidified potassium manganate?

A

Purple to colourless.

61
Q

What is added to alkenes to form a halogenoalkane?

(not free radical substitution)

A

Hydrogen halide.

62
Q

What is the mechanism for the reaction between alkenes and hydrogen halides?

A
63
Q

What is the order in stability of the different carbocations?

A
64
Q

Why are seconary and tertiary carbocations more stable?

A

Alkyl groups push electrons towards the positive carbon making it more stable so it has a higher chance of being formed.

65
Q

In the reaction of prop-1-ene with hydrogen bromide, which is the major product: 2-Bromopropane or 1-bromopropane?

Why?

A
66
Q

Show the addition polymerisation of propene to create poly(propene).

A
67
Q

How can plastics be recycled?

A

Some, like poly(propene) can be re-moulded into new objects.

Others are cracked into its monomers and the monomers are used to make more plastic.

68
Q

What are the advantages of incinerating plastics?

A

Heat produced can be used to generate electricity.

Avoid incorrect disposal of plasics (since they aren’t biodegradable)

69
Q

What is a disadvantage of incinerating plastics and how is it fixed?

A

Toxic gases can be released (like HCl, released by burning PVC)

Flue gas scrubbers are used to neutralise acidic gases (like HCl) by firing a base at the gases.

70
Q

What metals do catalytic convertes often contain?

A

Platinum, rhodium and iridium metals

71
Q

WHat do catalytic converters do?

A
  • Convert carbon monoxide to carbon dioxide.
  • Covert NOx into nitrogen and oxygen.
  • Burn unburnt hydrocarbons into water and carbon dioxide.
72
Q

How is biodiesel obtained?

A

Refining oil and fats

73
Q

How is biogas obtained?

A

From the breakdown of organic matter.

74
Q

How is bioethanol obtained?

A

Sugar is fermented to produce ethanol.

75
Q

What are the advantages of biofuels?

A
76
Q

What are the disadvantages of biofuels?

A
77
Q

What is a sigma bond?

A

The bond formed when two s orbitals overlap.

78
Q

What is a pi bond?

A

Bond formed when two p orbitals overlap, forming an oblong shape.

79
Q

Why do sigma bonds have a higher bond enthalpy than pi bonds?

A

Sigma bonds have more electron density (electrons are in a sphere between the two nuclei while in pi bonds it is just surrounding them).

Therefore electrostatic force of attraction is bigger in sigma bonds, so higher bond enthalpy.

80
Q

Why are alkenes more reactive than alkanes?

A

They have a sigma and a pi bon, so high electron density. Electrons in the pi bond stick out a bit and the pi bond has a lower bond enthalpy.

This therefore makes it easier to the pi bond to be broken and so it is more reactive.

81
Q

What are the products for the reaction between halogenoalkanes and water?

A

Alcohol and hydrogen halide.

82
Q

What are the conditions needed for water to react with halogenoalkanes to produce an alcohol?

A

Heat the mixture as water reacts slowly with the halogenoalkane.

83
Q

What type of reaction is the reaction between halogenoalkanes and water to give an alcohol and a hydrogen halide?

A

Nucleophilic substitution

84
Q

Why do halogenoalkanes become more reactive as we go down the group?

A

Halide ion is bigger so there’s less attraction between the nucleus and the bonding electrons (distance, shielding) therefore the bond is weaker and so the bond enthalpy is lower and therefore the bond is easier to break.

85
Q

If we add If we react chlor, bromo and iodo alkanes with silver nitrate, in what order do the precipitates appear?

A
  1. Yellow ppt (AgI)
  2. Cream ppt (AgBr)
  3. White ppt (AgCl)
86
Q

What is the order in reactivity (from most reactive to least) for the primary, secondary and tertiary halogenoalkanes?

A
  1. Tertiary
  2. Secondary
  3. Primary
87
Q

What is a nucleophile?

A

An electron pair donor.

88
Q

What are the products for the reaction between a halogenoalkane and a source of OH- ions (i.e. NaOH) with water as a solvent?

A

Alcohol + metal halide

89
Q

What are the conditions for the reaction between OH- (aq) ions and a halogenoalkane?

A

Heat under reflux NaOH(aq)

(or other OH- source)

90
Q

What is the mechanism for the reaction between a halogenoalkane and OH- (aq)?

A
91
Q

What are the products for the reaction between a halogenoalkane and potassium cyanide (or other cyanide ion source)?

A

Nitrile (+1 carbon in chain) and a salt i.e. potassium halide.

92
Q

What are the conditions for the reaction between halogenoalkanes and potassium cyanide?

A

Heat ethanolic potassium cyanide under reflux.

93
Q

What type of reaction is the reaction between halogenoalkanes and cyanide ions?

A

Nucleophilic substitution

94
Q

What is the reaction mechanism for the reaction between a halogenoalkane and ethanolic potassium cyanide?

A
95
Q

What are the products for the reaction between a halogenoalkane and ammonia?

A

Amine (fishy smell) and ammonium halide.

96
Q

what are the conditions for the reaction between a halogenoalkane and ammonia?

A

Heat witn excess ethanolic ammonia

97
Q

What is the mechanism for the reaction between a halogenoalkane and ethanolic excess ammonia?

A
98
Q

What is are the products for the reaction between OH- ions dissolved in ethanol and a halogenoalkane?

A

Alkene + metal halide + water

99
Q

What are the conditions for the reaction between a halogenoalkane and NaOH dissolved in ethanol?

A

Heat ethanolic sodium hydroxide under reflux.

100
Q

What type of reaction is the reaction between a halogenoalkane and NaOH dissolved in ethanol?

A

Elimination

101
Q

What is the mechanism for the reaction between a halogenoalkane and NaOH dissolved in ethanol?

A
102
Q

During the reaction with a halogenoalkane, how do the hydroxide ions behave as when dissolved in water?

A

Nucleophile

103
Q

During the reaction with a halogenoalkane, how do the hydroxide ions behave as when dissolved in ethanol?

A

Base (accepts an H+)

104
Q

What is the equation for the reaction between an alcohol and phosphorous pentachloride to make a halogenoalkane?

A
105
Q

What is the equation for the reaction between an alcohol and HCl to make a halogenoalkane?

A
106
Q

When reacting to make halogenoalkanes, write, from slowest to fastest, at which speed do the different alcohols (primary, secondary…) react.

A

primary, secondary, tertiary.

107
Q

What are the conditions to form a bromoalkane from an alcohol?

A

Add NaBr and acid catalyst (50% sulfuric acid)

108
Q

How is a bromoalkane made from an alcohol?

A

NaBr reacts with sulfuric acid to create HBr.

Then:

R-OH + HBr > R-Br + H2O

109
Q

What type of reaction is the production of a halogenoalkane from an alcohol?

A

Nucleophilic subsitution.

110
Q

What are the conditions to create an iodoalkane from an alcohol?

A

Heat under reflux alcohol, red phosphorus and iodine.

111
Q

How is an iodialkane made from an alcohol?

A

The red phosphorous reacts with the idine in situ to make PI3.

Then:

112
Q

What are the products for the dehydration of alcohols?

A

alkene + water

113
Q

What are the conditions for the dehydration of alcohols?

A

Acid catalyst (sulfuric acid H2SO4 or phosphoric H3PO4)

114
Q

In the dehydration of alcohols, where can the doublebond form in the resulting alkene?

A

Either side of the carbon bonded to the -OH.

115
Q

What is the colour seen when potassium dichromate (K2Cr2O7) is reduced to Cr3+ during the oxidation of alcohols?

A

Orange to green

116
Q

How do the different alcohols oxidise when heated under reflux with potassium dichromate?

A

1ary - aldehyde and further oxidises to carboxylic acid

2ary - ketone

3ary - isn’t oxidised by potassium dichromate.

117
Q

What is fehling solution?

A

Cu2+ dissolved in NaOH.

118
Q

What is benedict’s solution?

A

Cu2+ ions dissolved in sodium carbonate.

119
Q

How can fehling and benedict’s solution indicate if there’s an aldehyde or a ketone?

A

Aldehyde - blue to brick red.

Ketone - No colour change. remains blue.

120
Q

How can you use the technique of separation to purify an organic product?

A
  • Add an aqueous layer to dissolve aqueous impurities.
  • Remove the aqueous layer and keep the organic layer.
  • Add anhydrous CaCl2 - it is a dehydrating agent and will remove the remaining aqueous solution.
  • Filter the drying agent.
121
Q

How do impurities affect boiling point?

A

Higher boiling point and substance boils over a bigger range.

AL Chemistry (Edexcel) 2024 MT (20 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions