C9

Question 1

what are most of the compounds in crude oil?

Answer 1

hydrocarbons, which contain only hydrogen and carbon atoms.

Question 2

are alkanes saturated or unsaturated hydrocarbons?

Answer 2

saturated hydrocarbons.

Question 3

list the chemical formula of methane, ethane, propane, butane.

Answer 3

CH4
C2H6
C3H8
C4H10

Question 4

what is the general formula for an alkane?

Answer 4

CnH2n+2

Question 5

what is the display formula for ethane?

Answer 5

H H
| |
H-C-C-H
| |
H H

Question 6

what are fractions?

Answer 6

liquids with different boiling ranges separated from a mixture of liquids (crude oil)

Question 7

functional group for alkene , alcohol , carboxylic acids

Answer 7

C=C , -OH , -COOH

Question 8

alkene formula

Answer 8

CnH2n

Question 9

alcohol formula

Answer 9

CnH(2n+1)OH

Question 10

carboxylic acid formula

Answer 10

CnH(2n+1)COOH

Question 11

why are different hydrocarbons collected at different levels of a fractional distillation column?

Answer 11

different hydrocarbons have different boiling points (so they condense at different levels)

Question 12

fractions with smaller hydrocarbon molecules and lower boiling temps have …

Answer 12

lower viscosities , very flammable , produce little smoke

Question 13

word equation for the complete combustion of ethane

Answer 13

ethane + oxygen -> carbon dioxide + water

Question 14

when pure hydrocarbons burn completely…

Answer 14

they are oxidised to carbon dioxide and water