Exploring Gas Demonstrations and Reactions

What is the primary purpose of rapidly pushing down the plunger in the fire syringe demonstration?

• To mix the cotton fiber thoroughly inside the cylinder

• To release the cotton fiber from the cylinder

• To decrease the air pressure inside the cylinder

• To rapidly increase the air pressure inside the cylinder, thus increasing temperature

Why is it necessary to rapidly increase the pressure inside the fire syringe?

• To make the demonstration more visually appealing

• To increase the temperature sufficiently to ignite the cotton

• To cool down the air inside

• To create a vacuum

What scientific principle is demonstrated by the fire syringe experiment?

• Boyle's Law

• Charles's Law

• The principle of conservation of mass

• The principle of conservation of energy

What happens to the cotton fiber as a result of the increased pressure and temperature in the fire syringe demonstration?

• The cotton fiber turns into a liquid

• The cotton fiber remains unchanged

• The cotton fiber disintegrates

• The cotton fiber catches on fire

Why does the cotton fiber catch fire in the fire syringe demonstration?

• Because the cotton is treated with chemicals

• Due to friction against the cylinder walls

• Because of the rapid increase in air pressure and temperature

• Due to the presence of oxygen

What is the initial step in preparing the soda bottle for the second demonstration?

• Placing the bottle in sunlight

• Filling the bottle with hot water

• Freezing the bottle

• Shaking the bottle vigorously

What is the effect of swirling hot water in the soda bottle?

• It heats the air inside the bottle

• It cleans the bottle

• It cools down the bottle

• It creates a vortex

What is the purpose of tightening the cap very quickly after dumping out the water in the soda bottle demonstration?

• To maintain the temperature of the hot water

• To prevent air from entering the bottle

• To trap the water vapor inside the bottle

• To increase the pressure inside the bottle

What observable effect occurs to the soda bottle as the water vapor inside cools?

• The bottle remains unchanged

• The bottle implodes slightly due to decreased air pressure

• The bottle's color changes

• The bottle expands

What does the rapid cooling of the bottle demonstrate?

• Thermal expansion

• Thermal contraction

• The indestructibility of plastic

• The effect of gravity on liquids