Organic compounds 1 Flashcards
What is a homologous series?
Groups of compounds that share a general formula and have similar chemical properties
What are alkanes?
Single bonds between carbons
What are alkenes?
Double bond between two carbons
What are alkynes?
Triple bonds between two carbons
Names given for the number of carbons 1-8?
1) meth
2) eth
3) prop
4) but
5) pent
6) hex
7) hept
8) oct
What is a structural isomer?
Molecules with the same chemical formula but where the atoms are arranged differently within the molecule
What is an unsaturated molecule?
A hydrocarbon containing a double or a triple bond
What is a hydrocarbon?
Compounds consisting of hydrogen and carbon only, bonded together covalently
What is crude oil?
Mixture of various hydrocarbons with different chain lengths
How is crude oil separated?
Fractional distillation
How does fractional distillation separate substances?
According to their boiling points
Use of refinery gas (LPG)?
Domestic gas
Use for petrol (light gasoline)?
Production of petrol
Use for naphta?
Plastic and petrol production
Use for kerosene/paraffin?
Aviation and home heating fuel
Use for diesel oil/gas oil?
Motor fuel
What does octane number mean?
The tendency of a fuel to resist auto-ignition
What fuel has an octane number of 0?
Heptane
What fuel has an octane number of 100?
2,2,4-trimethyl-pentane
What are the 4 processes used to produce petrol?
Isomerisation
Catalytic cracking
Dehydrocyclisation
Adding oxygenates
What is catalytic cracking?
Breaking a long chan into several smaller chains
What is isomerisation?
Changing long, straight chains into short, branched chains
What is dehydrocyclisation?
Removing hydrogen and changing a chain into a ring
What is adding oxygenates?
Add substances like methanol, ethanol and MTBE
What hydrocarbons produce when burned?
Carbon dioxide and water
What are mercaptans?
Substance added to refinery gas to give it a distinctive smell
Uses for ethyne?
Welding or cutting
What is auto-ignition?
Ignition in an internal combustion engine before a spark is produced.
What is an aliphatic compound?
Any hydrocarbon not containing a benzene ring.
What chemicals are used to prepare ethyne?
Water and calcium dicarbide
What chemicals are used to produce ethene?
Ethanol and aluminium oxide