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Higher chemistry > Section 6 homologous series > Flashcards

Section 6 homologous series Flashcards

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1
Q

Homologous series definitions

A

A family of chemicals with the same general formula and similar chemical properties.

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2
Q

Alkanes general formula

A

CnH2n+2

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3
Q

Alkenes general formula

A

CnH2n

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4
Q

Cycloalkanes general formula

A

CnH2n

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5
Q

Naming hydrocarbons

A

Branch chain position (numbers)
Number of branch chains (prefix)
Name branch chains
Name of main chain
Position of any functional groups.

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6
Q

saturation test

A

Add bromine water to the hydrocarbon, if the colour remains orange, the chemical is saturated.

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6
Q

Unsaturation test

A

Add bromine water to the hydrocarbon, if the colour goes from orange to colourless, the chemical is unsaturated.

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7
Q

Why is bromine water used in bromine water test

A

It has the best colour change/ most distinctive colour change.

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8
Q

Alkanes saturation

A

Saturated

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9
Q

Alkenes saturation

A

Unsaturated

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10
Q

Cycloalkanes saturation

A

Saturated

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11
Q

Alkene addition reaction types

A

Hydrogenation
Hydration
Halogenation

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12
Q

Saturated definition

A

Where a molecule has only single bonds between the carbon atoms.

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13
Q

UnSaturated definition

A

Where a molecule contains a carbon to carbon double/triple bond.

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14
Q

Addition definition

A

Where a molecule reacts with a unsaturated molecule, breaking apart the carbon to carbon double/ triple bond and saturating the molecule.

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15
Q

Hydration definition

A

Where a water molecule is added to an unsaturated chemical, breaking apart the carbon to carbon double/ triple bond and saturating the molecule.

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16
Q

Hydrogenation definition

A

Where a hydrogen molecule is added to an unsaturated molecule, breaking apart the carbon to carbon double / triple bond and saturating the molecule.

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17
Q

Halogenation definition

A

Where a halogen molecule is reacted to an unsaturated molecule to break apart the carbon to carbon double / triple bond and saturate the molecule.

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18
Q

Alkene hydration

A

Alkene + water —> alcohol

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19
Q

Alkene hydrogenation

A

Alkene + hydrogen —-> alkane

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20
Q

Alkene Halogenation

A

Alkene + halogen —-> saturated dihalogen Alkane

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21
Q

Isomer definition

A

A molecule with the same general formula but a different structural formula and different chemical properties.

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22
Q

Rules of hydrocarbon boiling point

A

As the length of the chain increases the number of electrons increases, which increases the force of the London dispersion forces, meaning more heat energy is required to break the intermolecular forces .meaning the melting and boiling point increases

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23
Q

Volatility

A

The measure of how easily something evaporates

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24
Q

Hydrocarbons volatility rule

A

As the chain length increases the number of electrons increases, this increases the force of the London dispersion forces, which means that more heat energy is required for the molecule to evaporate, decreasing the volatility.

25
Q

Solubility rule hydrocarbons

A

Hydrocarbons are non polar molecules, since they do not have PD -PD intermolecular forces, and don’t contain hydrogen bonding either, meaning they don’t dissolve in water but do in non polar liquids/ solutions.

26
Q

Functional group definition

A

The part of a molecule which is responsible for the molecules chemical properties.

27
Q

Alkenes functional group

A

Carbon to carbon double bond

28
Q

Alcohols functional group

A

Hydroxyl

29
Q

General formula of alcohols
(Alkanols)

A

CnH2n+1OH

29
Q

General formula of alcohols
(Alkanols)

A

CnH2n+1OH

30
Q

Alcohol boiling point rule

A

As the number of carbons in the chain increases the London dispersion forces increases, due to the increase in the number of electrons, meaning the MP and BP increase due to more energy being required to break apart these intermolecular forces.

Alcohols also have higher melting and boiling points than other homologous series, due to the hydroxyl containing PD PD and Hydrogen bonding van def waals

31
Q

Volatility of alcohols

A

Have lower volatility than other homologous series due to hydroxyl group and hydrogen bonding and PD PD van der waals

32
Q

What are diols and triols

A

Where an alcohol has more hydroxyl functional groups -2and3 - making them more soluble in water, have a higher mp and bp and less volatile.

33
Q

Alcohols solubility in water

A

Soluble because of hydrogen bonding in the hydroxyl group
As number of hydroxyls increases the solubility increases
As the chain length increases the hydroxyl group becomes less significant and the solubility decreases.

34
Q

Primary alcohols

A

Alcohols where the carbon bonded to the hydroxyl group is only bonded to one other carbon.

35
Q

Secondary alcohols

A

Alcohols where the carbon bonded to the hydroxyl group is only bonded to two other carbons.

36
Q

Tertiary alcohols

A

Alcohols where the carbon attached to the hydroxyl group is bonded to three other carbon atoms.

37
Q

Functional group of carboxylic acids

A

COOH (carboxyl)

38
Q

General formula of carboxylic acids

A

CnH2n+1COOH

39
Q

Carboxylic acids solubility
In water

A

They are soluble due to the hydroxyl group in the carboxyl functional group, which contains hydrogen bonding and PDPD van der waals

40
Q

Carboxylic acids volatility

A

They are less volatile than other homologous series due to the carboxyl functional group containing PDPD and hydrogen bonding.
As the length of a chain increases the volatility decreases due to London dispersion forces.

40
Q

Carboxylic acids volatility

A

They are less volatile than other homologous series due to the carboxyl functional group containing PDPD and hydrogen bonding.
As the length of a chain increases the volatility decreases due to London dispersion forces.

41
Q

Carboxylic acid boiling point rule

A

As the carbon chain increases the
boiling point increases due to London dispersion forces getting stronger, since there is more electrons.
It has higher boiling point than other homologous series due to the carboxyl group.

42
Q

Carboxylic acid reactions with metal oxides

A

Propanoic acid + sodium oxide —-> sodium propanoate + water

43
Q

Carboxylic acid reaction with metal hydroxide

A

Propanoic acid + sodium hydroxide —-> sodium propanoate + water

44
Q

Carboxylic acid reaction with metal carbonate

A

Propanoic acid + sodium carbonate —-> sodium propanoate + carbon dioxide + water

45
Q

Oxidation in carbon compounds

A

An increase in the oxygen to hydrogen ratio within a carbon compound.

46
Q

Reduction in carbon compounds

A

A decrease in the oxygen to hydrogen ratio within a carbon compound.

47
Q

Primary alcohol oxidation

A

Aldehydes and then carboxylic acids

48
Q

Secondary alcohol oxidation

A

Ketones

49
Q

Aldehyde and ketone functional group

A

Carbonyl (C=O)

50
Q

Difference between an aldehyde and a ketone

A

Aldehydes are formed by oxidation of primary alcohols, whereas ketones are formed by oxidation of secondary alcohols
Aldehydes have the carbonyl functional group at the end of the chain, ketones have their functional group in the middle of the chain.
Aldehydes can be oxidised further whereas ketones cannot be oxidised further.

51
Q

Aldehydes suffix

A

Al

52
Q

Ketones suffix

A

One

53
Q

Ketones homologous series

A

Alkanones

54
Q

Aldehydes homologous series

A

Alkanals

55
Q

Alcohols oxidising agents

A

Acidified dichromate (orange -blue/green)
heated copper oxide (black to orange)

56
Q

Tertiary alcohols oxidation

A

Cannot oxidise

57
Q

Oxidising agents for distinguishing between aldehydes and ketones

A

Fehlings solution (blue to red/brown in aldehydes)
Tollen’s reagent (clourless to silver mirror in aldehydes)
Acidified dichromate ions (orange to green/blue in aldehydes)

Higher chemistry (10 decks)

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