Fuels And Thermo Flashcards
Give two commercial sources of hydrogen gas
Electrolysis of water
Steam reforming of natural gas
State two main advantages of using H2 as a fuel
Low polluting
High octane number
What are the two main hydrocarbon components of LPG
Propane, butane
What is the purpose of adding mercaptans to natural gas
To give gas a smell
Give an example of an oxygenate used in petrol
Methanol
Why are oxygenates added to petrol
To reduce pollution caused by fuel
What term is used to describe compounds that have the same molecular formula but different structural formula
Structural isomers
What is the advantage of adding tetraethyllead to petrol
To increase octane number
Why was the use of tetraethyllead discontinued
Toxic
How would you expect boiling points of petrol and diesel to compare
Diesel has a higher boiling point
What is a gas produced by anaerobic bacterial decomposition of animal waste
Methane
Give a major use of methane
Fuel
Why is the concentration of Methane in atmosphere a cause of concern
Global warming
Why do high molecular mass alkanes have high boiling points
Stronger intermolecular bonds
Write a balanced equation for the dehydrocylisation of oil refining
C7H16 -> C6H5CH3
What is the purpose of dehydrocyclisation in oil refining
Increase octane number of a fuel
Identify a physical property that is the basis for hydrocarbons being isolated as naphtha
boiling points
Give a major use for kerosene and residue
Kerosene - jet fuel
Residue - roofing
Name the oil refining process that converts octane into 224
Isomerisation
Name the oil refining process that converts octane into ethylbenzene
Dehydrocyclisation
