Which description best fits the particles in a gas?
They vibrate slowly about a fixed point
They vibrate quickly, free to move around other particles
They move quickly and randomly in all directions
What happens to atmospheric pressure as the altitude increases?
It increases
It stays the same
It decreases
What causes the pressure that a gas exerts?
Collisions with the particles on the walls of the container
The charge of the particles
The size of the particles
When a gas is heated but the volume does not change, which of these statements is true?
The force per collision increases only
The number of collisions per second increases only
Both the force per collision and the number of collisions per second increase
What property of a gas is linked to its temperature?
The average kinetic energy of gas particles
The weight of the gas particles
When a gas is compressed at a constant temperature, which of these statements is true?
What will happen to the volume of a gas if the pressure on it increases by a factor of 3?
It increases by a factor of 3
It gets 3 times smaller
A container of gas has volume 4 m3. The pressure in the container is 10 kPa. What will the volume of the gas be if the container is compressed to 2 m3?
20 kPa
2.5 kPa
0.40 kPa
To test how the pressure of a gas varies with its volume, which other variable must be controlled?
The amount of lighting in the laboratory
The temperature
Making sure the weather is the same outside
A bicycle pump becomes warmer when it compresses air. Why is this?
The person pumping has made the gas hot by the heat from her hands
The pressure has risen
Work has been done in squashing the gas