Particle Model & Pressure Practice Questions

The gas produces a force on the inside wall of the container.

Tick one box to show the direction of this force.

• The force acts parallel to the wall.
• The force acts at right angles to the wall.
• The force acts at 45° to the wall.
• The force acts along the wall in random directions.

Explain how the molecules of the gas produce a pressure on the walls of the container.

Which statements describe the air particles inside the football?

Tick two boxes.

• The particles move in random directions.
• The particles all move at exactly the same speed.
• The particles collide with each other and with the inside surface of the ball.
• The particles vibrate about fixed positions.
• The particles move in circular paths around the inside of the ball.

While the student is pumping, the barrel of the pump becomes warm.

Complete the sentence.

Doing work on the gas in the pump increases the ______ energy of the gas.

Complete the table.

State the relationship between the pressure and the volume of the gas shown by the data in the table.

Give one condition that must be true for this relationship to apply.

Name the independent variable and the dependent variable in this investigation.

Give one control variable in this investigation.

What was the range of temperature used in the investigation?

From ______ °C to ______ °C

The student concluded:

"The pressure of the gas is directly proportional to the temperature in °C."

Use the data in the table to explain why this conclusion is not correct.

Calculate the total volume of the helium at a pressure of $1.0 \times 10^{5}\ \mathrm{Pa}$.

Total volume = ______ $\mathrm{m^3}$

Each balloon holds $5000\ \mathrm{cm^3}$ of helium when it is full.

Calculate the maximum number of balloons that can be filled from the cylinder.

Calculate the volume of the bubble at the surface of the lake.

Volume = ______ $\mathrm{cm^3}$

As the bubble rises, its volume increases and the pressure of the air inside it decreases.

Use the particle model to explain why the pressure decreases.

While the cyclist pushes the handle of the pump in, the temperature of the air inside the pump increases.

Explain why.

Later, the bicycle is left in bright sunshine and the air inside the tyre becomes hotter.

The volume of the tyre does not change.

Explain why the pressure of the air inside the tyre increases.

The plunger is pushed in slowly until the pressure of the air inside the syringe is $250\ \mathrm{kPa}$.

Calculate the distance the plunger moves.

Distance = ______ cm

Give two assumptions that were made in the calculation in part (a).