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chemistry > alkanes/ alkenes > Flashcards

alkanes/ alkenes Flashcards

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1
Q

alkanes

A

saturated hydrocarbons

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2
Q

saturated

A

contains single C-C bonds only

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3
Q

naming alkanes

A

all end in ane
start depends on no. C
1 - Meth…
2 - Eth…
3 - Prop…
4 - But…
5 - Pent…

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4
Q

homologous series

A
  • have similar chemical properties
  • have same functional group
  • have same general formula
  • differ from next member by a CH2 unit
  • shows gradual trend in physical properties
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5
Q

functional group

A

a group of atoms responsible for the chemical properties of a compound
eg functional group of alkanes is a single C-C (saturated bond)

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6
Q

molecular formula

A

shows exact no. atoms of each element present in a molecule

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7
Q

displayed formula

A

shows how atoms are arranged using lines to represent covalent bonds between atoms

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8
Q

structural formula

A

shows how atoms are arranged - without using lines to represent covalent bonds between atoms

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9
Q

general formuka

A

shows the simplest algebraic formula of a member of a homologous series

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10
Q

general formula of alkanes

A

CnH2n+2

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11
Q

why alkanes get thicker as length of carbon chain increases

A

larger so stronger intermolecular forces, more energy needed to overcome forces so alkanes are thicker as chain lengths increases

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12
Q

alkenes

A

unsaturated hydrocarbons

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13
Q

unsaturated

A

contains a double C=C bond

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14
Q

why no methene

A

can’t have a double bone with only one carbon

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15
Q

functional group of alkenes

A

double C=C bond

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16
Q

alkenes come from

A

cracking long chain alkanes

17
Q

general alkene formula

A

CnH2n

18
Q

alkenes displayed formula

A

can have the double bond between any of the carbons leading to alternate forms of each alkene

19
Q

why do mtp/bp increase alkenes

A

more carbons so bigger molecules
intermolecular forces stronger
more energy to overcome

20
Q

small molecule alkanes uses

A

FUELS
- combust easily

21
Q

alkene uses

A

polymers
plastics

chemistry (17 decks)

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