Organic chem

Question 1

State the combustion reaction for alkanes (use CH4)xc

Answer 1

CH4 + 2O2 –> CO2 + 2H20

Question 2

Alkane substitution reaction with chlorine

CH4 + Cl2 –> ?

Answer 2

CH4 + Cl2 –> CH3Cl +HCl

Question 3

Do most organic cmpds dissolve in water? why?

Answer 3

No, they are largely covalent and not polar

Question 4

Saturated compound

Answer 4

Carbon atom joined by single covalent bonds

Question 5

Unsaturated cmpds

Answer 5

Carbon atom joined by double or triple covalent bonds

Question 6

Are Alkanes saturated

Answer 6

yes

Question 7

Formula for alkanes

Answer 7

CnH(2n+2)

Question 8

Formula for alkenes

Answer 8

CnH2n

Question 9

C2H4 + H20 –>

Answer 9

C2H5OH

Question 10

bromine test of unsaturation: When added to a unsaturated organic cmpd: ________-

Answer 10

the brown colour of bromine will turn colourless

Question 11

Are alkenes saturated

Answer 11

No

Question 12

How polymerisation happen for alkenes

Answer 12

C = C double bond in each monomer breaks, allowing monomers to join

Question 13

how is ethene formed from ethanol

Answer 13

Heat ethanol with H2SO4 (dehydrating agent)

Question 14

How ethanol form carboxylic acid, state eqn

Answer 14

oxidation

C2H5OH + 2[O] –> CH3COOH + H20

Question 15

Carboxylic acid general formula

Answer 15

CnH(2n+1)COOH

Question 16

Ester formation formula

Answer 16

Ethonoic acid + ethanol –> ester + water

Question 17

Methanoic acid + butanol –> ________

Answer 17

Buthyl Methanoate + water

Question 18

How make ethanoic acid (2)

Answer 18

Fermentation

Oxidation from ethanol

Question 19

Petroleum gases use

Answer 19

Bottled gas for gas cooker

Question 20

Petrol/Gasoline

Answer 20

Fuel for motor cehicles

Question 21

Naphtha uses

Answer 21

feedstock for petrochemicals

Question 22

Kerosene/ paraffin

Answer 22

fuel for jet aircraft; fuel for oil stoves

Question 23

diesel oil

Answer 23

fuel for diesel engines

Question 24

lubricating oil

Answer 24

lubricant in engines; for making waxes and polishes

Question 25

bitumen

Answer 25

to surface roads

Question 26

What is cracking

Answer 26

Breaking larger hydrocarbon molecules into smaller molecules

Question 27

Product of cracking

Answer 27

smaller molecules of alkanes, alkenes and hydrogen

Question 28

Thermal cracking

Answer 28

alkanes heated to high temp under high pressure

Question 29

Catalytic cracking

Answer 29

alkane molecules passed over a catalyst at high temp.

Question 30

Alcohol formula

Answer 30

CH(2n+1)OH

Question 31

Complete combustion general formula

Answer 31

CxHy + (x+y/4) O2 –> xCO2 + y/2 H2O

Question 32

what happens when there isnt enough oxygen for combustion

Answer 32

incomplete combustion happens, which result in production of carbon monoxide or soot

Question 33

What is a isomer

Answer 33

molecules that hv same molecular formula, but diff arrangement of atoms in space