Revision

What does a foam fire extinguisher do?

What is the test for oxygen?

• Glowing splint test
• Flame test
• Spark test
• Burning splint test

What does a carbon dioxide fire extinguisher do?

• It generates water to put out the fire.
• It suffocates the fire by displacing oxygen with carbon dioxide gas.
• It increases the temperature to extinguish the fire.
• It creates a barrier to prevent the fire from spreading.

Why is hydrogen not very reactive in the air

• Not a lot in the air

• It’s very light

• It doesn’t feel like it

• Because it’s not the same as oxygen

Name different type of fuels

• gasoline, diesel

• wind energy, solar energy

• propane, coal

• Banana, potato

How much percentage is oxygen in the air

Which gas is most commonly used in the process of carbonation of soft drinks?

• Oxygen

• Nitrogen

• Carbon dioxide

• Helium

What does carbon dioxide do to lime water

• Turns lime water red
• Forms a black precipitate of calcium carbonate
• Causes lime water to evaporate
• Turns the lime water cloudy

Which type of fire extinguisher is most suitable for electrical fires?

• Water fire extinguisher

• Foam fire extinguisher

• Dry powder fire extinguisher

• Carbon dioxide fire extinguisher

What is the primary danger of using water to extinguish an oil fire?

• It can cause the fire to spread.

• It increases the temperature of the oil.

• It reacts chemically with the oil.

• It evaporates too quickly to extinguish the fire.