6.3 Particle Model of Matter Flashcards
(19 cards)
Change in Thermal Energy
The product of the mass, specific heat capacity and temperature change of a substance
Chemical Changes
Changes to the chemical structure of a substance
The substance does not usually restore its original properties when the changes are reversed
Condensation
The changing from vapour state to a liquid state, when a
substance is cooled
Density
The mass per unit volume of an object
Evaporation
The changing from liquid state to a vapour state, when a substance is heated
Freezing
The changing from a liquid state to a solid state, when a substance is cooled
Gas Temperature
The temperature of a gas is directly proportional to the average kinetic energy of its molecules
Internal Energy
The energy stored by the atoms and molecules that make up a
system
It is equal to the sum of the total kinetic and potential energies of the particles in the system
Latent Heat
The energy required for a substance to change state
Latent Heat
The energy required for a substance to change state
Melting
The changing from solid state to liquid state, when a substance is heated
Pascals
The unit of pressure, equal to a force of one Newton acting
perpendicular to an area of one metre squared
Physical Changes
Changes to the physical properties of a substance which can
be reversed
Changes of state are physical changes since substances can restore their original properties when the changes are reversed
Pressure
The force acting perpendicular to a surface, per unit area
Specific Heat Capacity
The amount of energy needed to increase the temperature of one kilogram of a given substance by one degree Celsius
Specific Latent Heat of Fusion
The amount of energy needed to change the state of one kilogram of a substance from solid state to liquid state, whilst held at
constant temperature
Specific Latent Heat of Vaporisation
The amount of energy needed to change the state of one kilogram of a substance from liquid state to vapour state, whilst held at constant temperature
Specific Latent Heat
The amount of energy needed to change the state of one
kilogram of a substance, whilst held at constant temperature
Sublimation
The direct changing of a substance from a solid state to a vapour
state, without passing through the liquid phase
