Science lesson 15 Gas Behaviour

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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


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