Organic Chemistry Flashcards
What are hydrocarbons
Compounds made of hydrogen and carbon
What is crude oil made of a mixture of
Hydrocarbons
What types of bonds do alkanes have
Only single bonds
What types of bonds do alkenes have
Double bonds
General formula for alkane
Cn Hn+2
General formula for alkene
Cn Hn
Which hydrocarbons are saturated
Alkanes
Which hydrocarbon can form more bonds
Alkenes
What are alkanes similarities with each other
Similar chemical different physical
The longer the chain of the hydrocarbon
Higher melting point
First 4 alkanes
Methane
Ethane
Propane
Butane
Why is fractional distillation used
To separate hydrocarbons (crude oil)
How does a fractionating distillation work
Crude oil is heated in a fractionating column by a preheater
The shorter hydrocarbon with lower boiling point go on the top
Why do shorter chain hydrocarbons have a lower boiling point
Weaker intermolecular forces
What is the order of what is deposited at the fractionating column
Fuel Gas
Petrol
Naphtha
Kerosine
Diesel
Fuel Oil
Residue
Molecular formula of butane
C4 H10
What is complete combustion
Where there is enough oxygen for something to burn
Products of complete combustion
Water
Carbon dioxide
Products of incomplete combustion
Water
Carbon Monoxide
Carbon particulate
Example of thermal decomposition reaction
Cracking
What is Cracking
Braking of large alkane into smaller alkane and alkene
2 types of cracking
Catalytic
Steam
Catalytic cracking
Heating hydrocarbon to 550C over catalyst like ceramic
Steam cracking
Hydrocarbon to 800C
What happens with alkanes in bromine water and why
Remains orange because alkanes are already saturated
What happens with alkenes in bromine water and why
Turns clear as alkenes can react
Use of poly(ethene)
Plastic bag