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Fire Triangle

In this worksheet, students will look at the fire triangle and what is required for combustion and also the safety aspects in terms of what is required to fight fires.

'Fire Triangle' worksheet

Key stage:  KS 3

Curriculum topic:   Chemistry: Chemical Reactions

Curriculum subtopic:   Types of Chemical Reactions

Difficulty level:  

Worksheet Overview

QUESTION 1 of 10

For combustion to take place, three things must be present:

 

1. Fuel - the substance that burns, e.g. wood, oil.

2. Oxygen - when a fuel is burned it is reacting with the oxygen in the air.

3. Heat - this ignites the fuel and keeps the fire burning.

 

This can be represented in a diagram known as the Fire Triangle:

Fire triangle

 

The three essential ingredients for a fire are shown in the fire triangle. If any one of these ingredients is removed the fire will go out.

 

Fire fighters will try to remove one side of the triangle to extinguish a fire. There are several ways to extinguish a fire.  Here are some:

 

 Fire buckets Fire blanket Fire extinguisher Fire hose

 

Sand - When sand is added to a fire it removes the oxygen.

Fire Blankets - Fire blankets can be wrapped around burning objects or people. The blanket stops oxygen getting to the flame.

Carbon dioxide (CO2) - Carbon dioxide fire extinguishers are sprayed onto the fire to remove the oxygen.

Water - Water can be added to fires to remove the heat. Water must never be used on an electrical fire or any burning oil. Adding water to burning oil will cause the cause the fire to become fiercer. Shown below is a picture of what happens when water is added to burning oil in a chip pan (not good!):

 

Burning chip pan

 

If you ever experience a chip pan fire in your home place a damp towel over the pan, call 999 and leave the house.

Which if the following is the correct hazard symbol for a flammable substance?

 

A B C


A

B

C

Tick the substances below that are required for combustion to take place.

Heat

Water

Petrol

Fuel

Oxygen

Carbon dioxide

Which of the following substances can be used to extinguish a fire?

Petrol

Wood

Carbon dioxide

Oxygen

Water

Sand

Which of the following should never be added to an electrical fire?

Water

Sand

Carbon dioxide

Fire blanket

Tim is filling his petrol mower and accidentally spills some of the petrol. Which of the following should be added to to the spillage to prevent fire?

Sand

Carbon dioxide

Fire blanket

Someone has left the chip pan on and it has just begun to burn.

Listed below is a list of things that you should do to help . Put the list into the correct order.

 1st2nd3rdNEVER
Call 999
Place a damp towel over the pan
Pour water onto the burning oil
Leave the house

Which of the following should be found in every home (as recommended by the fire service), to protect you and your home from fire? Tick all the answers that you think are necessary.

Smoke alarm

Fire blanket

Sprinkler system

Carbon dioxide fire extinguisher

  • Question 1

Which if the following is the correct hazard symbol for a flammable substance?

 

A B C


CORRECT ANSWER
B
EDDIE SAYS
This hazard symbol must appear on all flammable substances used in science lab.
  • Question 2

Tick the substances below that are required for combustion to take place.

CORRECT ANSWER
Heat
Fuel
Oxygen
EDDIE SAYS
Heat, Fuel and Oxygen are the three sides of the fire triangle. Petrol is an example of a fuel, which is why "fuel" is better here. Water and CO2 are products of the fire.
  • Question 3

Which of the following substances can be used to extinguish a fire?

CORRECT ANSWER
Carbon dioxide
Water
Sand
EDDIE SAYS
There are many ways to put out a fire but carbon dioxide, water and sand are amongst the most common.
  • Question 4

Which of the following should never be added to an electrical fire?

CORRECT ANSWER
Water
EDDIE SAYS
Water should never be added to an electrical fire as it will increase the risk of electric shock and may cause further fires.
  • Question 5

Tim is filling his petrol mower and accidentally spills some of the petrol. Which of the following should be added to to the spillage to prevent fire?

CORRECT ANSWER
Sand
EDDIE SAYS
Sand would prevent oxygen getting to the fuel and will reduce the risk of it igniting. Fire blankets would be too small to cover such a spillage and the risk would still remain when the blanket is removed.
  • Question 6

Someone has left the chip pan on and it has just begun to burn.

Listed below is a list of things that you should do to help . Put the list into the correct order.

CORRECT ANSWER
 1st2nd3rdNEVER
Call 999
Place a damp towel over the pan
Pour water onto the burning oil
Leave the house
EDDIE SAYS
If the fire is burning too much simply leave the house and call 999 from a mobile or use a neighbour's phone. NEVER tackle a fire yourself unless you are completely sure you can do it safely and quickly.
  • Question 7

Which of the following should be found in every home (as recommended by the fire service), to protect you and your home from fire? Tick all the answers that you think are necessary.

CORRECT ANSWER
Smoke alarm
Fire blanket
Carbon dioxide fire extinguisher
EDDIE SAYS
It is very important that you are aware of fire safety procedures - if you aren't, make sure you do some research to be completely sure. It could be a matter of life and death!
---- OR ----

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