All Saints Secondary
Science Faculty
UNIT 2 HOMEWORK 10 – FIRE
1.
For a fire to burn, three things are needed.
a) What are those three things?
b) What is another word for burning?
c) When anything burns it reacts with the oxygen in the air.
Write a word equation to describe methane burning to produce
carbon dioxide and water.
2.
The three things needed for a fire to burn can be shown in a
diagram called the fire triangle.
a) Draw a diagram to show the fire triangle.
b) What is removed from the fire triangle when water is used to
put out a fire made of burning wood?
d) Why should you not throw water on a chip pan fire?
e) Explain why throwing sand over burning petrol will put out the
fire.
Int 1 Chemistry
Unit 2 Homework
All Saints Secondary
Science Faculty
UNIT 2 HOMEWORK 11 – FINITE RESOURCES
1.
The Fossil fuels were formed millions of years ago
a) Name the 4 fossil fuels.
b) How were they made?
2.
Fossil fuels are described as finite resources.
a) What does the term finite mean?
b) What problems can you see happening if we continue to use
fossil fuels at the rate that we do?
c) Explain why transporting oil can be dangerous to the
environment.
3.
Fossil fuels are made up mainly of compounds called hydrocarbons.
a) What elements do hydrocarbon compounds contain?
b) When a hydrocarbon burns in plenty of oxygen two products are
made. What are they?
c) The following apparatus proves that the above products are
made.
B
C
Describe what you would see in both B and C.
Int 1 Chemistry
Unit 2 Homework
All Saints Secondary
Science Faculty
UNIT 2 HOMEWORK 12 – RENEWABLE RESOURCES
1.
The fossil fuels are finite resources. This means they will run out
eventually and cannot be replaced.
a) What name do we give to fuels which can be replaced?
b) What source of energy can sugar can be used for?
c) What source of energy can be obtained from water?
2.
Biogas contains a renewable source of energy.
a) What is it?
b) How is it made?
c) How can it be used?
Int 1 Chemistry
Unit 2 Homework
All Saints Secondary
Science Faculty
UNIT 2 HOMEWORK 13 – IMPORTANT PROCESSES
1.
Copy and complete the following passage using the word bank below.
fuels
distillation
boiling point
diesel
petrol
jet
hydrocarbon
Crude oil is a mixture of ……………………………… It can be separated
into fractions using fractional ……………………………… The fractions
have different …………………… ………………… ranges. The main use of the
fractions is as ………………… These include ……………………, …………………….
and kerosene. Kerosene is used in …………… aircraft.
2.
As the molecular size of the fractions change so do their
properties, such as boiling point, viscosity, flammability and ease of
evaportation.
a) Petrol vaporises and burns more easily than diesel. Which is
made of the bigger molecules?
b) Lubricating oil is more viscous than petrol. What does this
mean?
3.
Fractional distillation of crude oil produces more long chain
hydrocarbons than we need and not enough of the smaller ones like
petrol and diesel.
a) What name do we give to the process where long chain
hydrocarbons and broken up into smaller more useful molecules?
b) Give the chemical formula for X in the following reaction.
C6H14  C4H10  X
Int 1 Chemistry
Unit 2 Homework
All Saints Secondary
Science Faculty
UNIT 2 HOMEWORK 14 – POLLUTION PROBLEMS
1.
The burning of hydrocarbons can produce many pollutants.
a) What is a pollutant?
b) When a hydrocarbon burns in a poor supply of oxygen a
poisonous gas is produced. What is it?
c) What other pollutant is produced?
d) Incomplete combustion of diesel produces what harmful
substance?
2.
All fossil fuels contain a small amount of sulphur. When the fuels
are burned sulphur dioxide can be produced.
a) In what way does sulphur dioxide harm the environment?
b) What two elements present in air combine in car engines to
form a poisonous gas?
c) How does this product harm our environment?
3.
Years ago lead compounds were added to petrol to improve the way
the petrol was burned. Nowadays the use of lead in petrol is
banned.
a) Why is the use of lead compounds in petrol not permitted
anymore?
b) In place of lead compounds, petrol is further refined and called
‘unleaded’ petrol. What toxic fumes are produced when
unleaded petrol is burned?
c) Explain what a catalytic converter does and how it can reduce
air pollution.
Int 1 Chemistry
Unit 2 Homework
All Saints Secondary
Science Faculty
UNIT 2 HOMEWORK 14 – REVISION
FOR
ACCESS TEST
Part A
1.
Which word describes the behaviour of oil and grease when they
are added to water?
soluble
2.
or
Which of the following words best describes a silk fibre?
natural
3.
or
synthetic
Which gas do burning substances react with?
nitrogen
4.
insoluble
or
oxygen
Which of the following is an example of a fossil fuel?
wood
or
peat
Part B
5.
Cleaning chemicals break up oil and grease into small droplets.
Name a manufactured product that contains cleaning chemicals.
6.
The results of testing some fibres are shown in the table.
Which fibre could withstand the use of a hot iron, but would dry
only slowly when wet?
Fibre
wool
nylon
cotton
Terylene
7.
Heat Resistance
poor
poor
good
moderate
Drying rate
poor
good
poor
good
Putting a damp towel over a chip pan fire can successfully put out
the flames. Explain how this works.
Int 1 Chemistry
Unit 2 Homework
All Saints Secondary
8.
Science Faculty
The world’s fossil fuels are finite resources. Explain what is meant
by the term ‘finite’.
9.
The index of a book contains the following references to fuels.
On which page would you expect to find out about natural gas?
Subject
coal
gas
oil
peat
wood
10.
Page Number
16
5
72
38
29
Air pollution from cars has been reduced by the use of catalytic
converters.
What happens to pollutant gases when they pass through a
catalytic converter?
Int 1 Chemistry
Unit 2 Homework