chem organic (crude oil) retrieval

what is crude oil formed from

ancient biomass/plankton

what is crude oil

a mixture of hydrocarbons

why is crude oil a finite resource

it will eventually run out

give the name of a molecule made of hydrogen and carbon only

hydrocarbon

what is the name of the alkane with one carbon

methane

what is the name of the alkane with two carbons

ethane

what is the name of the alkane with three carbons

propane

what is the name of the alkane with four carbons

butane

what is the general formula for alkanes

CnH2n+2

what is the name of the process used to separate crude oil into useful fractions

fractional distillation

what is the name given to a mixture of hydrocarbons with similar boiling points

a fraction

as hydrocarbons get longer what happens to their boiling points

their boiling point increases

As hydrocarbons get longer what happens their viscosity

their viscosity increases

As hydrocarbons get longer what happens their flammability?

their flammability decreases

What do we call a substance which releases energy when combusted?

a fuel

What gas do fuels react with during combustion?

oxygen

What are the products for the complete combustion of a hydrocarbon?

carbon dioxide and water

What are the products for the incomplete combustion of a hydrocarbon?

carbon monoxide and water

OR

carbon (soot) and water

What is the name of the process that breaks down long hydrocarbons into smaller molecules?

cracking

Why do we break down long hydrocarbons?

smaller hydrocarbons are more useful

What conditions are needed for cracking?

high temperature, steam, catalyst

how are alkenes different to alkanes

they contain a carbon - carbon double bond

why are alkenes useful

they can be used for making polymers and other chemicals

what is the test for alkenes

add bromine water

what is the positive result of the alkene test

bromine water turns from orange to colourless