PRE-ASSESSMENT

Last summer vacation, the Cruz family decided to go to Pagudpod, Ilocos Norte to have a beach party. On their way to Ilocos, all of them were surprised when the tire suddenly exploded. What is the probable explanation for the blown out tire during a long summer drive?

• High temperature causes a decrease in volume.

• The amount of the gases inside the tire is increased.

• The mass of the gases inside the tire increases causing a blown up tire.

• The volume of gases increases as the temperature increases, causing a blown up tire.

What happens to the density of a gas as its volume decreases at constant pressure and temperature?

• decreases

• stays the same

• increases

• unpredictable

What law explains the mechanism of gas compressor?

• Boyle’s Law

• Combined Gas Law

• Charles’ Law

• Ideal Gas Law

What gas law best explains the explosion of the heated aerosol container?

• Boyle’s Law

• Combined Gas Law

• Charles’ Law

• Ideal Gas Law

What will happen to the gas pressure as the temperature increases, if the amount and volume of the gas are kept constant?

• the gas pressure decreases

• the gas pressure increases

• the gas pressure remains the same

• there is no significant effect

Which of the following phenomena best illustrates Charles’ Law?

• carbon dioxide being dissolved in water

• expansion of the balloon as it is being submerged in hot water

• breathing apparatus being used by a patient

• leavening agent causing the fluffiness of cake products

What is most likely to happen when an aerosol can is heated?

• the can will be deformed

• the can will stay the same

• the can will eventually explode

• the can will tarnish

Jane can still pump air in the party balloon even though it is already inflated. What explains this phenomenon?

• balloons look better if its size is bigger

• balloons are made up of plastic

• the air inside the balloon is hot

• air molecules can be compressed

Determine what will happen to the temperature of a confined gas as the pressure decreases.

• the gas temperature stays the same

• the gas temperature decreases

• the gas temperature increases

• there is no enough data

A balloon with a volume of 200 mL at 30°C is submerged in hot water to obtain a temperature of 50°C. Find out what will happen to the volume of the balloon, provided the pressure remains the same.

• the volume of the balloon will become higher than 200 mL

• the volume of the balloon will become lower than 200 mL

• the volume of the balloon will stay the same

• there is no enough data