Skip to content

Course home

Organic chemistry

Organic chemistry

EasyMedium
1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162
Question 7

Crude oil is a complex mixture of organic compounds that serves as a vital source of energy and chemical raw materials.

a.

Almost all of the compounds in crude oil are hydrocarbons. Name the two chemical elements that constitute a hydrocarbon.

[1]
b.

Crude oil is processed in an industrial refinery using fractional distillation.

State what is meant by the chemical term fraction in this context.

[1]
c.

Describe the industrial process of fractional distillation used to separate crude oil into different fractions.

[3]
d.

The list below shows four different fractions obtained from crude oil:

refinery gaseskerosenedieselbitumen \text{refinery gases} \quad \text{kerosene} \quad \text{diesel} \quad \text{bitumen} refinery gaseskerosenedieselbitumen

Which of these fractions has the lowest boiling point?

[1]
e.

Which of these fractions is the most viscous?

[1]
f.

When fuels like kerosene are burned under conditions of insufficient oxygen, incomplete combustion occurs.

Name the dangerous gas produced during this incomplete combustion.

[1]
g.

Explain why this gas is hazardous to human health.

[2]
Markscheme

Organic chemistry Questions

  1. IGCSE
  2. /Chemistry
  3. /Organic chemistry

Question bank