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- Q1
If a balloon is squeezed, what happens to the pressure of the gas inside the balloon?
It stays the same.
It decreases.
It increases.
The pressure depends on the type of gas in the balloon.
30s - Q2
According to Charles’ Law as the volume occupied of a given sample of gas at constant pressure is decreased, the temperature will
The change cannot be predicted.
decrease.
become zero.
increase.
30s - Q3
If a sample of helium gas has a volume of 120 mL and a pressure of 850mm Hg, what is the new volume if the pressure is changed to 425 mm Hg?
240 mL
120 mL
60 mL
The change cannot be predicted.
30s - Q4
Which statement best explains why a hot-air balloon rises when the air in the balloon is heated?
The temperature of a gas is directly related to its volume. Thus, the volume of the balloon increases, making the density smaller. This lifts the balloon.
The temperature of the gas is directly related to its pressure. The pressure therefore increases, and this lifts the balloon.
Hot air rises inside the balloon, and this lifts the balloon.
Some of the gas escapes from the bottom of the balloon, thus decreasing the mass of gas in the balloon. This decreases the density of the gas in the balloon, which lifts the balloon.
30s - Q5
Which phenomenon best illustrates Charles’ Law?
The leavening agent causing the fluffiness of cake products
Carbon dioxide is dissolved in water.
Expansion of the balloon as it is being submerged in hot water
Breathing apparatus being used by a patient
30s - Q6
A balloon with a volume of 200mL at 30 °C is submerged in hot water to obtain a temperature of 50 °C. Which of the following is expected to happen to the volume of the balloon if the pressure is kept constant?
The volume of the balloon will become lower than 200 mL
The volume of the balloon will become higher than 200 mL.
The volume of the balloon will stay the same.
There is not enough data.
30s - Q7
Why is gas easier to compress than liquid and solid?
Its volume increases more under pressure than an equal volume of liquid does.
The volume increases more under pressure than an equal volume of solid does
The volume of gas particles is larger compared to the overall volume occupied by the gas.
The space between gas particles is much larger than the space between liquid or solid particles.
30s - Q8
Consider a 1.0 L container of Neon gas at 273 K and 1 atm. In which of the following conditions will the average kinetic energy increase?
I. The temperature increased to 1000 °C.
II. The temperature is decreased to 500 °C.
III. The volume has decreased to 0.5 L.
IV. The number of moles of neon is doubled.
B. II only
C. I and III
D. I, II, and IV
A. I only
30s - Q9
When the Kelvin temperature of an enclosed gas doubles, how do the particles of the gas move at a certain temperature?
Decrease in average kinetic energy
Move faster
Strike the walls of the container with less force
Decrease in volume
30s - Q10
Which type of gas is the basis for the kinetic-molecular theory?
Perfect gas
Real gas
Ideal gas
Smelly gas
30s - Q11
Jane can still pump air in the party balloon even though it is already inflated. What explains this phenomenon?
Balloons are made up of plastic.
Balloons look better if their size is bigger.
Air molecules can be compressed.
The air inside the balloon is hot.
30s - Q12
What happens to the lungs of a scuba diver as it moves closer to the seafloor?
The lungs expand.
There is no change in the lungs.
The lungs compress.
The lungs explode.
30s - Q13
Records show that the incidence of tire explosion is high during the summer season. Which of the following gives the best explanation for this observation?
Vehicles’ tires are not well maintained
High temperature during the summer season causes the air inside the tire to expand.
There is too much air inside the tires.
There are more travelers during summer vacation.
30s - Q14
If the temperature of a fixed quantity of gas decreases and the pressure remains unchanged,
its volume is neglected.
its volume is unchanged.
its volume increases
its volume decreases
30s - Q15
How can you possibly prove that gases have negligible mass?
Feel the weight of the samples on both hands.
Put a balloon in a digital balance before and after you fill it with air
Ask two persons to hold a box filled with air.
Support your claim through an equation.
30s