F2 1st Term IS WS 05 Answers

7.2       Burning

B. The fire triangle

i      Words to know:

	English term	Write the words again	Chinese term
1	Fire triangle	Fire triangle	火三角
2	Necessary conditions	Necessary conditions	必須條件
3	Fuel	Fuel	燃料
4	Oxygen	Oxygen	氧
5	High temperature	High temperature	高溫
6	Go out	Go out	熄滅

i      Fill in the blanks:

1        Fuel, oxygen and a sufficiently high temperature form the fire triangle.

2        Burning takes place only when all the necessary conditions of a fire triangle are present.

These conditions are fuel, oxygen and a sufficiently high temperature.

7        If any one of the conditions of a fire triangle is removed, the fire will go out.

8        When a fire breaks out, we should:

           -         keep calm;

           -         leave the flat using stairway and must not use the lift;

           -         call the Fire Services Department by dialling ‘999’ when you are safe.

          

i      Drawing:

Draw a fire triangle in the following space.

Refer to P.20 Fig. 7.7

i      Matching:

Ways to put out fire	Removed conditions of fire triangle
Turn off the gas tap of Bunsen burner	•Fuel
Pour water on the fire	•High temperature
Use the carbon dioxide extinguisher	•Oxygen
Use fire beaters to beat burning plants	•Oxygen
Use the fire blanket to put out fire	•Oxygen
Set up a fire break by removing trees	•Fuel