Physics Topic 3 - Particle Model of Matter

i still hate quizlet so much

chemical changes

changes to the chemical structure of a substance (when the changes are reversed, the substance doesn’t usually revert back to its original structure)

condensation

the changing from a gas to liquid (cooling of gas)

Density

the mass per unit volume of an object

evaporation

the changing from a liquid to a gas (heating of liquid)

freezing

the changing from a liquid to a solid (cooling of liquid)

gas temperature relationship with kinetic energy

it 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

kinetic energy + all potential energies of particles = internal energy

latent heat

the energy required for a substance to change state

melting

the changing from solid to liquid (heating of solid)

pascals

unit of pressure (equal to a force of one N acting perpendicular to an area of 1m^2)

physical changes

changes to the physical properties of a substance which can be reverse

pressure

force acting perpendicular to a surface, per unit area

specific heat capacity

amount of energy needed to increase the temperature of 1kg of a given substance by 1 degree

specific latent heat of fusion

amount of energy needed to change the state of 1kg of a substance from solid to liquid maintaining same temperature

specific latent heat of vaporisation

amount of energy needed to change the state of 1kg of a substance from liquid to gas maintaining the same temperature

specific latent heat

amount of energy needed to change the state of 1kg of a substance maintaining the same temperature

sublimination

direct changing of a substance from solid to gas without passing through the liquid phase