F2 IS WS05 Answers

1st Term WS 05 Submission date：_____________ Name：______________________ Class & no.：2 _________(     )

7.2       Burning

B. The fire triangle

i      Words to know:

	English term	Write the words again	Chinese term
1	Fire triangle		火三角
2	Necessary conditions		必須條件
3	Fuel		燃料
4	Oxygen		氧
5	High temperature		高溫
6	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	•	Fuel
Pour water on the fire	•High temperature
Use the carbon dioxide extinguisher	•Oxygen	•	Oxygen
Use fire beaters to beat burning plants	•Oxygen
Use the fire blanket to put out fire	•Oxygen	•	High temperature
Set up a fire break by removing trees	•Fuel