CHEMISTRY PAPER 2 ORGANIC AND PHYSICAL
COMPLETE EXAM PRACTICE WITH MARK
SCHEME
◉ How do you write a balanced symbol equation for the complete
combustion of a hydrocarbon? Answer: Balance left hand side
Balance right hand side.
Balance anything left to balance
◉ What is crude oil? Answer: A mixture of hydrocarbons
◉ How is crude oil formed? Answer: It is a fossil fuel formed over
millions of years when plankton and other sea creatures die, fall to
the sea bed and become covered by layers of sand and silt. Sand and
silt means that no oxygen gets to the dead bodies. The heat and
pressure builds up and slowly turns them to hydrocarbons.
◉ Are fossil fuels finite? Answer: Yes.
◉ How do you seperate diffrent compounds from crude oil? Answer:
Using fractional distillation
◉ What does LPG mostly conatin? Answer: Butane & Propane
,◉ What is the order of the boiling points in fractional distillation?
R,P,N,K,D,L,F,B Answer: Refinery Gas / Light Ends
Petrol / Gasoline
Naphtha
Kerosene
Diesel / Gas Oil
Lubricating Oil
Fuel Oil / Heavy Distillates
Bitumen / Residue
◉ What is the boiling point of refinery gas in fractional distillation?
Answer: (Lowest boiling point, often <25°C)
◉ What is the boiling point of petrol in fractional distillation?
Answer: Approx. 40-100°C
◉ What is the boiling point of Naphtha in fractional distillation?
Answer: approx. 100-150°C
◉ What is the boiling point of Kerosene in fractional distillation?
Answer: approx. 150-240°C
, ◉ What is the boiling point of Disel Oil in fractional distillation?
Answer: approx. 220-300°C
◉ What is the boiling point of Lubricating Oil in fractional
distillation Answer: approx. 300-400°C
◉ What is the boiling point of Heavy Oil in fractional distillation?
Answer: approx. 350-400°C
◉ What is the boiling point of Butimen or residue in fractional
distillation? Answer: (Highest boiling point, >400°C or non-
vaporizing)
◉ How does fractional distillation work? Answer: The crude oil is
heated until most of it has turned into a gas.
They then enter a fractionating column which has a gradient of hot
to cold.
The longer hydrocarbons have higher boiling points so they
condense back into liquids straight away. The shorter hydrocarbons
have lower boiling points so they turn into liquid much later on
when it's cooler.
Crude Oil is left sperated out into differnt fraction. W
COMPLETE EXAM PRACTICE WITH MARK
SCHEME
◉ How do you write a balanced symbol equation for the complete
combustion of a hydrocarbon? Answer: Balance left hand side
Balance right hand side.
Balance anything left to balance
◉ What is crude oil? Answer: A mixture of hydrocarbons
◉ How is crude oil formed? Answer: It is a fossil fuel formed over
millions of years when plankton and other sea creatures die, fall to
the sea bed and become covered by layers of sand and silt. Sand and
silt means that no oxygen gets to the dead bodies. The heat and
pressure builds up and slowly turns them to hydrocarbons.
◉ Are fossil fuels finite? Answer: Yes.
◉ How do you seperate diffrent compounds from crude oil? Answer:
Using fractional distillation
◉ What does LPG mostly conatin? Answer: Butane & Propane
,◉ What is the order of the boiling points in fractional distillation?
R,P,N,K,D,L,F,B Answer: Refinery Gas / Light Ends
Petrol / Gasoline
Naphtha
Kerosene
Diesel / Gas Oil
Lubricating Oil
Fuel Oil / Heavy Distillates
Bitumen / Residue
◉ What is the boiling point of refinery gas in fractional distillation?
Answer: (Lowest boiling point, often <25°C)
◉ What is the boiling point of petrol in fractional distillation?
Answer: Approx. 40-100°C
◉ What is the boiling point of Naphtha in fractional distillation?
Answer: approx. 100-150°C
◉ What is the boiling point of Kerosene in fractional distillation?
Answer: approx. 150-240°C
, ◉ What is the boiling point of Disel Oil in fractional distillation?
Answer: approx. 220-300°C
◉ What is the boiling point of Lubricating Oil in fractional
distillation Answer: approx. 300-400°C
◉ What is the boiling point of Heavy Oil in fractional distillation?
Answer: approx. 350-400°C
◉ What is the boiling point of Butimen or residue in fractional
distillation? Answer: (Highest boiling point, >400°C or non-
vaporizing)
◉ How does fractional distillation work? Answer: The crude oil is
heated until most of it has turned into a gas.
They then enter a fractionating column which has a gradient of hot
to cold.
The longer hydrocarbons have higher boiling points so they
condense back into liquids straight away. The shorter hydrocarbons
have lower boiling points so they turn into liquid much later on
when it's cooler.
Crude Oil is left sperated out into differnt fraction. W
