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HSC Chemistry > module seven - revision deck > Flashcards

module seven - revision deck Flashcards

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1
Q

alkane general formula

A

CnH2n+2

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2
Q

characteristics of alkanes, alkenes and alkynes

A

saturated hydrocarbons
non-polar
dispersion forces
generally low boiling points, increase as carbon chain increases

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3
Q

alkene general formula

A

CnH2n

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4
Q

Alkyne general formula

A

CnH2n-2

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5
Q

alcohol general formula

A

CnH2n+1OH

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6
Q

primary alcohol

A

one in which only one carbon atom is bonded to the carbon atom attached to the OH group

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7
Q

carbonyl function group

A

oxygen double bonded to a carbon

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8
Q

aldehyde

A

carbonyl group attached to a terminal carbon atom of the chain
suffix -anal

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9
Q

ketone

A

carbonyl group attached to a middle carbon

suffix - anone

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10
Q

carboxyl group

A

carbon double bonded to an oxygen and a hydroxyl group

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11
Q

amine general formula

A

R-NH2

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12
Q

amines

A

contained NH2 attached to a hydrocarbon chain
can be classified as either primary, secondary or tertiary depending on how many hydrocarbon groups are attached to the nitrogen

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13
Q

amide

A

contains a carbon double bonded to an oxygen as well as an NH2 group
formed from carboxylic acids when the hydroxyl group is replaced by an amine group

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14
Q

amide general formula

A

RCONH2

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15
Q

isomer

A

molecules that have the same molecular formula but their atoms are arranged differently

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16
Q

chain isomers

A

involve rearrangement of the carbon skeleton

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17
Q

position isomers

A

made by moving the position of the functional group

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18
Q

functional group isomers

A

compounds with the same molecular formula but a different functional group

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19
Q

intramolecular bonds in alkanes, alkenes, alkynes

A

strong covalent bonds

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20
Q

shape of single bonded carbon molecules

A

tetrahedral with a bond angle of 109.5 degrees

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21
Q

shape of carbon carbon double bond

A

trigonal planar with bond angle of 120 degrees

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22
Q

shape of carbon carbon triple bond

A

linear with a bond angle of 180 degrees

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23
Q

environmental impact of hydrogens

A

mining for crude oil and natural gas is often ocean-based
oil spills can cause severe environmental damage
burning fossil fuels releases carbon dioxide, a greenhouse gas
production and transport of fossil fuels causes methane emissions

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24
Q

Exxon Valdez Oil Spill

A

1989 Exxon Valdez oil spill in alaska saw 41 million litres of oil spilled, contaminating > 1800km of coast lines, causing four human deaths and hundreds of thousands of animal deaths

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25
Q

greenhouse gas definition

A

cause heat to be trapped in the earth’s atmosphere causing global warming

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26
Q

economic impact of hydrocarbons

A

reliable energy source for industries
global economy is reliant on effective and reliable transportation which is primarily fuelled by hydrocarbons
leads to job creation

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27
Q

sociocultural impacts of using hydrocarbons

A

polymers are used in packaging, clothing, homewares, varnishes and adhesives
can be used to create medicines and pharmaceutical drugs
reliable and quick source of energy to power our lives
relatively inexpensive and accessible source of energy

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28
Q

addition reactions

A

unsaturated molecules undergo addition reactions where two or more molecules are joined to form a larger molecule

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29
Q

halogenation

A

alkene + halogen –> dihaloalkane

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30
Q

hydrogenation

A

alkene + hydrogen –> alkane

usually occurs in the presence of a metal catalyst such as nickel, platinum, palladium or rhodium

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31
Q

hydration

A

alkene + water –> alcohol

requires a dilute sulfuric acid catalyst

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32
Q

hydrogen halide addition

A

alkene + hydrogen halide –> haloalkane

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33
Q

Markovnikov’s rule

A

when a compound of the form HX is added to an asymmetrical alkene, the hydrogen becomes attached to the carbon with more hydrogens already attached to it

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34
Q

substitution reactions

A

occur in saturated molecules where one species on a molecule is replaced by another

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35
Q

alkane substitution with halogens

A

alkane + halogen –> haloalkane + hydrogen halide
the halogen molecule is broken up in the presence of UV light, creating a free radical
the free radical replaces one of the hydrogens on the alkane creating a haloalkane and a hydrogen halide

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36
Q

properties of alcohols

A

polar molecule due to hydroxyl group
higher boiling points than respective alkanes
increased branching lowers the boiling point due to weaker dispersion forces
small alcohols are more soluble in water
flammable

37
Q

enthalpy of combustion of alcohols

A

enthalpy of combustion refers to the change in the total energy of a system during a combustion reaction

38
Q

combustion of alcohols

A

alcohols burn in oxygen, forming water and carbon dioxide

39
Q

dehydration of alcohols

A

alcohol –> alkene + water

requires a concentrated acid or aluminium oxide catalyst as well as heat

40
Q

substitution with HX

A

alcohol + hydrogen halide –> alkyl halide + water

in reactions with hydrogen halides, tertiary are most reactive

41
Q

oxidation of alcohols

A

requires an oxidising agent as potassium permanganate or acidified potassium

primary alcohol –> aldehydes –> carboxylic acids

secondary alcohol –> ketones

tertiary alcohols do not undergo oxidation

42
Q

production of alcohols from alkenes

A

alkene + water in the presence of sulfuric acid –> alcohol

43
Q

production of alcohol from halogenated organic compounds

A

haloalkane + water –> alcohol + hydrogen halide

44
Q

production of alcohol from fermentation

A

C6H12O6 –> 2C2H5OH + 2CO2

temperature must be kept low, slightly acidic pH, anaerobic conditions, yeast catalyst

45
Q

formation of fossil fuels

A

form from the remains of ancient plants, animals and microorganisms and are a non-renewable resource
coal forms when wood degrades over a long period of time. Black coal has the highest carbon percentage, so it releases the most heat. Coal is used to generate 75% of electricity in Australia
crude oil is a mixture of hydrocarbons consisting mostly of alkanes of different lengths. It’s separated into its constituents using fractional distillation
natural gas is mostly made up of methane

46
Q

biofuels

A

derived from plant material like sugar cane, vegetable oils and grains

47
Q

biogas

A

biogas is a mixture of gases that are released during the anaerobic breakdown of organic waste such as sewage, agricultural waste, rubbish and food waste

48
Q

bioethanol

A

bioethanol can be formed through the fermentation of starch

bioethanol is blended with regular petrol to make e10

49
Q

biodiesel

A

biodiesel is a fuel containing a mixture of esters. These esters are derived from vegetable oils or animal fats like palm oil, canola oil and lard through the process of transesterification

50
Q

energy release - natural gas vs. bioethanol

A

natural gas releases 54kJ/g while bioethanol releases only 30kJ/g

51
Q

properties of alcohols - boiling point

A

boiling point increases as the molecule size increases and are a lot higher than the parent alcohol. this is due to the presence of dipole-dipole forces and hydrogen bonds
increased branching reduces the strength of dispersion forces so long alcohols have higher boiling points than branched alcohols.
the more crowded the hydroxyl group, the harder it is to form hydrogen bonds, so boiling point decreases from primary to tertiary

52
Q

properties of alcohols - solubility

A

small alcohols dissolve easily in water because the new hydrogen bonds formed with water have a similar strength to the exisiting hydrogen bonds between alcohols molecules

in larger alcohols, the hydrocarbon chain can only form dispersion forces with the water molecules, which aren’t as strong as the existing hydrogen bonds

53
Q

properties of aldehydes and ketones

A

carbonyl group is highly polar resulting in the formation of dipole-dipole bonds. this results in higher boiling points than alkanes/alkenes but lower boiling points than alcohols
more soluble in water than hydrocarbons but less soluble than alcohols

54
Q

formation of amines

A

hydrogens from ammonia are replaced with an alkyl group

55
Q

primary, secondary and tertiary amines

A

primary amines are when one hydrogen from the ammonia is replaced with an alkyl group
secondary amines form when two hydrogens from the ammonia molecule are replaced with alkyl groups
tertiary amines are when all three hydrogens are replaced with alkyl groups

56
Q

properties of amines

A

polar molecules with high boiling points due to hydrogen bonds - lower boiling points than alcohols as nitrogen is less electronegative than oxygen

57
Q

amides properties + test

A

polar molecules with high boiling points due to hydrogen bonds

to test for an amide: add sodium hydroxide solution and heat. if it gives off ammonia when heated, but not when cold, it is an amide.
ammonia is characterised by its odour and it turns red litmus paper blue

58
Q

carboxylic acid properties

A

weak acids
more polar than alcohols and have high boiling points due to the presence of hydrogen bonds
shorter chains are soluble in water, but solubility decreases as length of carbon chain increases

59
Q

comparing boiling point of organic compounds

A

alkanes, alkenes, alkynes - esters - amines - alcohols - carboxylic acids - amides

alkanes and alkenes have relatively low boiling points since they have only dispersion forces
haloalkanes have much higher boiling points due to their polarity
the more electronegative atoms in a molecule, the more hydrogen bonds can form and therefore the higher boiling point
aldehydes and ketones can’t form hydrogen bonds so they have lower boiling points
carboxylic acids have higher boiling points than alcohols
amides have the highest boiling point as they contain both oxygen and nitrogen
amines generally have lower boiling points than organic compounds with oxygen

60
Q

comparing solubility of organic compounds

A

non-polar hydrocarbons are insoluble in water
small polar molecules can form hydrogen bonds with water molecules making them soluble - solubility decreases as the molecule gets larger
in organic solvents, hydrocarbons and haloalkanes are soluble
solubility of polar organic molecules in organic solvents increases as they become larger
branching reduces the boiling point and solubility of organic compounds in water

61
Q

formation and structure of esters

A

formed by combining an alcohol with a carboxylic acid
similar structure to carboxylic acids, except that an alkyl group is attached to the oxygen rather than a hydrogen atom
concentrated sulfuric acid is used as a catalyst and it is also heated to speed up the reaction
reflux is used

62
Q

properties of esters

A

tend to be liquid at room temperature
boiling points are much lower than carboxylic acids of similar masses as their main forces are dipole-dipole
most are not very soluble in water, but are in organic molecules

63
Q

reflux process

A

reactants are heated for an extended period of time without any loss of reactants or products
as the mixture is heated, the volatile components evaporate and move into a vertical condenser where the gases are cooled so they return to the reaction mixture in the flask

64
Q

organic components of reflux mixture

A

ester
carboxylic acid
alcohol

65
Q

inorganic components of a reflux mixture

A 
water
sulfuric acid (present in ion form)
66
Q

substitution reaction to form amines

A

haloalkane + ammonia –> amine + ammonium salt

67
Q

condensation reaction to produce primary amides

A

carboxylic acid + ammonia –> primary amide + water

68
Q

condensation reaction to produce secondary amides

A

carboxylic acid + primary amine –> secondary amine + water

69
Q

LDPE production

A

produced using high temperatures ad pressure

70
Q

LDPE structure

A

significant branching and is an amorphous polymer

71
Q

LDPE properties and uses

A

low density, lower melting point, lightweight and flexible

used to make plastic bags, soft toys and plastic food wrap

72
Q

HDPE production

A

produced using lower pressures and temperatures and a Ziegler-Natta Catalyst

73
Q

HDPE structure

A

unbranched, crystalline polymer. this structure allows it to form stronger dispersion forces

74
Q

HDPE properties and uses

A

higher melting point and less flexibility
used for plastic water bottles, shampoo bottles and recycling bins
hdpe is more opaque, rigid and has higher tensile strength compared to ldpe

75
Q

polyethylene monomer

A

(CH2CH2)n

76
Q

vinyl chloride monomer (chloroethene)

A

(CH2CHCl)n

77
Q

PVC structure

A

mainly amorphous because of the way the chlorine atoms stick out from the chain and their size
dipole-dipole forces due to the highly electronegative chloride

78
Q

PVC properties and uses

A

tends to be hard and rigid and is one of the most widely used polymers
high melting point
plasticisers are sometimes added to make the polymer softer and more flexible
used for electrical insulation, garden hoses and drainage and sewerage pipes

79
Q

styrene monomer

A

(CH2CHC6H5)n

80
Q

polystyrene structure

A

mainly amorphous because of the way the phenyl ring sticks out from change
no polar bonds due to the symmetry of the phenyl ring so only weak dispersion forces

81
Q

polystyrene properties and uses

A

tends to be clear, hard and brittle, however it is readily softened and moulded on heating and becomes rigid when cooled
used to make car battery cases, disposable drink cups and foam packaging materials

82
Q

tetrafluoroethylene monomer

A

(CF2CF2)n

83
Q

formation of PTFE

A

manufacturing process involves the synthesis of chloroform, fluorospar and sulfuric acid. some steps require temperatures of around 700 degrees

84
Q

PTFE properties and uses

A

commonly known as teflon - the non-stick surface on pans
also used to treat carpets and fabrics to make them stain resistant
very strong and is used to make high grade electrical insulation and pipe thread sealant
properties are due to the polar carbon-fluorine bonds and dipole-dipole interactions between the polymer chains

85
Q

Nylon -6,6

A

formed from hexandioic acid and 1,6-hexanediamine

(COC4H8CONHC6H12NH)n

86
Q

nylon-6,6 properties and uses

A

hydrogen bonds
strong fibres with high tensile strength
used to make clothing and fabrics, ropes and fishing lines and even machinery parts
properties are determined by the length of the monomer’s carbon chain. as chain length increases, absorbency and melting point decrease due to less hydrogen bonding

87
Q

Polyethene Terephthalate

A

PTE is formed from monomers 1,4- benzenedioic acid and 1,2 - ethanediol

88
Q

Polyethene Terephthalate properties and uses

A

polar ester group forms strong dipole-dipole forces between chains, making it a strong polymer
used to make clothing and fabric as well as recycable plastic bottles and packaging

HSC Chemistry (6 decks)

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