Physics Paper 1 (copy) Particle Model of Matter for Separate Science yr 10

What is the equation to work out density?

Density = Mass÷ volume

What is the standard unit for density?

Kg/m³

When a substance changes state what happens to the mass?

It stays the same

Why is a physical change different from a chemical change?

In physical changes the material recovers its original properties if the change is reversed

What do we call the energy stored inside a system by the particles that make up the system?

Internal Energy

What is the internal energy of a system made up of

The total kinetic and potential energy of all the particles

What effect does a change of state have on the overall temperature of a system?

None

What does the increase in temperature of a material depend on?

* The mass of the substance
* The type of material
* The energy input into the system

What is the energy needed for a substance to change state called?

Latent heat

What is the amount of energy required to change the state of one kilogram of a substance with no change in temperature?

Specific Latent Heat

What can a gas do?

Compressed or expanded

What can a pressure produce?

A net force at right angles to the wall of the container (or any surface)

What is pressure measured in?

Pascal Pa

What is volume measured in?

m³

What is the equation that links volume, pressure and constant, for a fixed mass of gas held at a constant temperature?

pressure × volume = constant

What is work the transfer of?

Energy by a force

What will work do to a gas?

Increase the internal energy and temperature

What is the unit for specific latent heat?

J/kg

What is the specific latent heat of fusion?

The change of state from solid to liquid

What is the specific latent heat of vaporisation?

The change of state from liquid to vapour

How do the particles in a gas move?

Randomly

What is the temperature of a gas related
to?

The average kinetic energy of the
molecules

If you increase the temperature of a gas,
held at a constant volume, what happens
to the pressure exerted by the gas?

Increases