Alkanes + Alkenes

Question 1

Cracking

Answer 1

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.

Question 2

Cracking equation

Answer 2

Longer Alkanes –> shorter alkanes + alkenes

Question 3

Shorter Alkanes

Answer 3

used as fuel

Question 4

Alkene

Answer 4

used to make polymers.

Unsaturated contains double carbon carbon bond

Question 5

Polymers

Answer 5

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

Question 6

Saturated

Answer 6

single bond . Alkanes

Question 7

Unsaturated

Answer 7

double bonds.Alkenes

Question 8

Crude oil

Answer 8

finite resource mixture of different length hydrocarbons

Question 9

Alkanes gen formula

Answer 9

CnH2n+2

Question 10

Homologous series

Answer 10

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

Question 11

Conditions for cracking

Answer 11

• Silica
• 600 degrees

Question 12

conditions for polymerisation

Answer 12

• high temp
• catalyst

Question 13

alkene gen formula

Answer 13

CnH2n

Question 14

Alkene + Br2

Answer 14

Test for Alkene

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

Question 15

Molecular formula

Answer 15

actual numbers of each element in a compound

Question 16

First four Alkanes mnemonic

Answer 16

Monkeys eat peanut butter

Question 17

First four Alkanes

Answer 17

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

Question 18

Methane structural formula

Answer 18

CH4

Question 19

Ethane structural formula

Answer 19

CH3 CH3

Question 20

Propane structura formula

Answer 20

CH3 CH2 CH3

Question 21

Butane structural formula

Answer 21

CH3CH2CH2CH3

Question 22

Alkanes with halogens in the presence of UV light equation

Answer 22

Halogen +alkane –UV–>Halogenalkane+ hydrogen halide

• substitution reaction

Question 23

First two Alkenes

Answer 23

Ethene + Propene

Question 24

Ethene structural formula

Answer 24

CH2 CH2

Question 25

alkenes with bromine

Answer 25

alkene + Bromine —> dibromoalkane

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

Question 26

Bromine water + Alkene

Answer 26

goes COLOURLESS

Question 27

Bromine water + Alkane

Answer 27

doesnt react remains orange

Question 28

functional group of Alkene

Answer 28

Functional group of alkenes is: C=C

Question 29

Alkanes with halogens in the presence of UV light example

Answer 29

Br2+c2h6 —UV–> C2H5Br + HBr

Question 30

what is polymerisation?

Answer 30

condensation reaction

Question 31

Problems of addition polymers

Answer 31

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

Question 32

bio polyesters

Answer 32

are biodegradable

Question 33

Alcohol functional group

Answer 33

contain -OH
eg . Methanol is CH3OH

Question 34

Ethanol can be oxidised

Answer 34

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

Question 35

product of ethene and bromine

Answer 35

dibromoethane