Quiz 4

Question 1

Describe the relationship between the molecular size of an alkane and its viscosity

Answer 1

The greater the molecular size of an alkane the more viscous(the thicker it is)

Question 2

Describe the relationship between molecular size of on alkane and its flammability

Answer 2

The greater the molecular size an alkane, less flammable it is

Question 3

Define hydrocarbon

Answer 3

A compound made of atoms of carbon and hydrogen only

Question 4

Name the homologous series of hydrocarbons that has double bonds

Answer 4

The alkenes

Question 5

Name the process used to separate the compounds in crude oil

Answer 5

Fractional distillation

Question 6

Name 5 fuels obtained from crude oil

Answer 6

Petrol
Diesel
Kerosene
Heavy fuel oil
Liquefied petroleum gases

Question 7

Explain how different fractions are separated from crude oil in fractional distillation

Answer 7

Crude oil is vaporised and the gases enter the fractionating column

There is a temperature gradient in the column

The gases rise up the column and condense at different levels based on their boiling points

Question 8

Explain how crude oil and natural gas is formed

Answer 8

Ancient plankton died and were covered in sediments

Subjected to high temperature and pressure over millions of years

Question 9

Name 2 types of cracking

Answer 9

Catalytic cracking and steam cracking

Question 10

Name the general products of cracking

Answer 10

Short alkanes and alkenes

Question 11

Name the substances that make up the majority of crude oil

Answer 11

Hydrocarbons

Question 12

Name the first 4 alkanes

Answer 12

Methane
Ethane
Propane
Butane

Question 13

State the conditions required for catalytic cracking

Answer 13

High temperature and a catalyst

Question 14

State the term used to describe families of carbon-containing compounds

Answer 14

Homologous series

Question 15

Name the homologous series of hydrocarbons which make up the majority of crude oil

Answer 15

The alkanes