C9 - crude oil

Question 1

what is a hydrocarbon

Answer 1

a molecule made of only carbon and hydrogen atoms

Question 2

what is crude oil

Answer 2

a mixture of different hydrocarbons formed from dead animals and plants that were squished by layers of sediment at the bottom of the ocean

Question 3

what is the formula for alkanes

Answer 3

Cn H2n+2

Question 4

what is the difference between saturated and unsaturated (hydrocarbons)

Answer 4

saturated only contains single covalent bonds, unsaturated contains double or triple bonds

Question 5

what is a homologous series

Answer 5

a group of molecules with the same general formula and functional group

Question 6

what is the order of prefixes for hydrocarbons

Answer 6

meth, eth, prop, but, pent, hex, sept, oct

Question 7

how do you name an alkane

Answer 7

the prefix is decided by the longest chain of carbons, then any extra carbons coming off are named as their longest chain and the carbon on the main chain they come off of, then a kane at the end

Question 8

what properties of alkanes increase/decrease as you make the chain longer

Answer 8

boiling point increases because higher imf
viscosity increases
flammability and volatility decrease

Question 9

why do you need to do fractional distillation to crude oil

Answer 9

to separate it into different hydrocarbons with different boiling points

Question 10

why are hydrocarbons bad for environment (2 things)

Answer 10

fracking for oil bad, release greenhouse gases when burnt

Question 11

what is cracking

Answer 11

breaking a hydrocarbon into smaller ones to get more useful small chain hydrocarbons