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Chemistry > Alkanes + Alkenes > Flashcards

Alkanes + Alkenes Flashcards

1
Q

Cracking

A

Turning longer Alkanes into shorter more useful Alkenes that can be used as fuel because they are less viscous, flammable and burn with a clean flame.

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2
Q

Cracking equation

A

Longer Alkanes –> shorter alkanes + alkenes

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3
Q

Shorter Alkanes

A

used as fuel

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4
Q

Alkene

A

used to make polymers.

Unsaturated contains double carbon carbon bond

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5
Q

Polymers

A

Very large molecules made when smaller molecules join together (monomers).

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6
Q

Saturated

A

single bond . Alkanes

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7
Q

Unsaturated

A

double bonds.Alkenes

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8
Q

Crude oil

A

finite resource mixture of different length hydrocarbons

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9
Q

Alkanes gen formula

A

CnH2n+2

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10
Q

Homologous series

A

Series of compounds with same general formula, same functional groups and similar chemical properties

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11
Q

Conditions for cracking

A
  • Silica
  • 600 degrees
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12
Q

conditions for polymerisation

A
  • high temp
  • catalyst
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13
Q

alkene gen formula

A

CnH2n

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14
Q

Alkene + Br2

A

Test for Alkene

Bromine will turn from orange to colourless in the presence of Alkene

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15
Q

Molecular formula

A

actual numbers of each element in a compound

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16
Q

First four Alkanes mnemonic

A

Monkeys eat peanut butter

17
Q

First four Alkanes

A

Methane - Ch2
Ethane- C2h4
Propane- C3h5
Butane- C4H6

18
Q

Methane structural formula

A

CH4

19
Q

Ethane structural formula

A

CH3 CH3

20
Q

Propane structura formula

A

CH3 CH2 CH3

21
Q

Butane structural formula

A

CH3CH2CH2CH3

22
Q

Alkanes with halogens in the presence of UV light equation

A

Halogen +alkane –UV–>Halogenalkane+ hydrogen halide

  • substitution reaction
23
Q

First two Alkenes

A

Ethene + Propene

24
Q

Ethene structural formula

A

CH2 CH2

25
Q

alkenes with bromine

A

alkene + Bromine —> dibromoalkane

  • addition reaction
  • involves removal of c=c double bond
26
Q

Bromine water + Alkene

A

goes COLOURLESS

27
Q

Bromine water + Alkane

A

doesnt react remains orange

28
Q

functional group of Alkene

A

Functional group of alkenes is: C=C

29
Q

Alkanes with halogens in the presence of UV light example

A

Br2+c2h6 —UV–> C2H5Br + HBr

30
Q

what is polymerisation?

A

condensation reaction

31
Q

Problems of addition polymers

A
  • not biodegradeable
  • produce carbon dioxide when burned
  • carbon dioxide is produced which contributes to global warking
32
Q

bio polyesters

A

are biodegradable

33
Q

Alcohol functional group

A

contain -OH
eg . Methanol is CH3OH

34
Q

Ethanol can be oxidised

A
  • burning in air
  • reaction with oxygen in air to form ethanoic acid microbial oxidation
  • Heating w/ potassium dichromate to
35
Q

product of ethene and bromine

A

dibromoethane

Chemistry (8 decks)

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