Particle model Flashcards
How much mass a substance contains compared to it’s volume is…
density
State the equation which links density, mass and volume
ρ=m/v
Name the change of state when a liquid becomes a solid
freezing
Name the change of state when a solid becomes a liquid
melting
Name the change of state when a liquid becomes a gas
evaporation
Name the change of state when a gas becomes a liquid
condensation
Name the change of state when a solid becomes a gas (without passing through liquid form)
sublimation
Changes of state are caused by the amount of _________ a substance has
energy
State changes are examples of ___________ change
physical
Physical changes are ones which can be _____________
reversed
A change which creates new products and cannot be reversed is _________ change
chemical
The energy stored inside a system by the particles which make it up is known as ____________ energy
internal
What is internal energy?
The total kinetic energy and potential energy of all the particles in a system
Energy stored within moving objects is __________
kinetic
Energy stored in particles because of their position is…?
potential energy
Particles wich are further apart have _________ potential energy
more
The energy needed to raise the temperature 1 kg of a material by 1ᵒC is the __________
specific heat capacity
The average kinetic energy of particles is known as the ___________
temperature
The amount of energy required to change the state of one kilogram of a substance with no change in temperature is the …?
specific latent heat
Latent heat of fusion is for changing…?
solid to liquid
Latent heat of vaporisation is for changing….?
liquid to vapour (gas)
Increasing temperature ______________ pressure in a gas if volume is constant
increases
The force exerted by gas on a surface as the particles collide with it is known as….?
gas pressure
State the units of density
kg/m3
State the units of volume
m3
Why doesn’t temperature increase during melting?
Energy is being used to weaken forces between particles
Why doesn’t temperature increase during evaporation
Energy is being used to weaken forces between particles
Why does temperature of a substance increase as it is heated?
Particles gain more kinetic energy and temperature is a measure of kinetic energy
Particles are arranged regularly in a ….?
solid
Particles are arranged randomly, but touching in a …?
liquid
Particles move around randomly in a ….?
gas
