Formative Practice 7.2 – Science Form 1 Chapter 7

Question 1:
Define combustion.

Answer:
Combustion is the reaction when a substance is heated with oxygen and releases heat and light energy.

Question 2:
What are the conditions needed for combustion?

Answer:
The presence of oxygen, heat and fuel

Question 3:
Luqman uses a fire blanket to put out a small fire at his house. How does the fire blanket work?

Answer:
Fire blanket is a special blanket made of fire-resistant substances. This blanket covers the fire and prevents oxygen from seeping below the blanket which will eventually extinguish the fire.

Question 4:
Give four ways to prevent fire.

Answer:
(a) Always be aware of electrical appliances used.

(b) Keep matches and lighters in a safe place.

(c) Keep flammable substances away from fire.

(d) Do not throw cigarette butts when they are still burning.

(e) Do not plug in too many appliances to a single electrical source.

(f) Install fire alarm at home.

Question 5:
Metals like potassium and sodium are kept in paraffin oil. Why?

Answer:
Potassium and sodium metals are flammable when exposed to air.