Science lesson 15 Gas Behaviour
You need to inflate balloons. You know that the temperature will rise 15 degrees between blowing up the balloons, and the balloons being needed. What must you do.
You know the temperature will increase, so the volume of gas in the balloons will also increase. To stop the balloons from bursting you must not completely fill them
What factor is kept unchanged when demonstrating Charles's law
pressure
What units are used to measure area
square meters m^2
Volume
the amount of space that matter fills
pressure
the force pushing on a surface divided by the area of that surface
What happens to the gas particles in the balloon as the gas is warmed
the gas particles move faster and further apart. They have more energy
When working with a gas, it is helpful to know
its volume, temperature and pressure
In what units is area measured in if pressure is measured in pascals
m^2
Temperature
measure of the average energy of random motion of the particles of a substance.
What could cause a helium balloon to burst as it rises in the atmosphere
As the balloon rises, pressure decreases on the outside of the helium balloon, this causes the balloon to expand (volume of the balloon increases). The would eventually stretch the balloon so much that it would burst
Describe how the motions of gas particles are related to the pressure exerted by the gas
As the moving gas particles collide with the walls of their container, they push on the container walls
How does Boyle's law describe the relationship between gas pressure and volume
At constant temperature, when gas pressure increases, gas volume decreases.
If pressure is measured in pascals, in what units must force be measured in
Newtons
What units are used to measure Force
Newtons (N)
What units are used to measure pressure
Pascals (Pa) or kilopascals (kPa)
What formula to you use to calculate pressure
Pressure = force / area
A machine exerts a force of 252N on a piston having an area of 0.430m^2. What is the pressure on the piston
Pressure= F/A Pressure= 252N/0.430m^2 Pressure = 586 Pa
Why does pumping more air into a basketball increase the pressure inside the ball
The greater the number of gas particles inside the basketball results in more collisions which increase the outward push of the gas
When the temperature of a gas at constant volume is decreased what happens to the pressure of the gas
it decreases
Boyle's law
When the pressure of a gas at constant temperature is increased the volume of the gas decreases. When the pressure is decreased the volume increases
Explain why increasing the temperature of a gas in a closed rigid container causes the pressure in the container to increase
When the temperature increases, gas particles move faster and collide more frequently with greater force. If the container is rigid, it cannot expand and the pressure increases.
Charles's law
When the temperature of a gas is increased at constant pressure, its volume increases. When the temperature of a gas is decreased at constant pressure, its volume decreases
When the temperature of a gas at constant volume is increased what happens to the pressure of the gas
it increases
What is the relationship between temperature and pressure
at temperature increases, pressure increases
