particle model Flashcards
why do gases have a lower density than solids and liquids?
the spacing between atoms increases by x10 so the particles have lots of energy to move
what kind of change is changing somethings state?
physical change
solid->liquid=
liquid->gas=
gas->liquid=
liquid->solid=
solid->gas=
solid->liquid= melting
liquid->gas= boiling/evaporating
gas->liquid= condensing
liquid->solid= freezing
solid->gas= sublimation
what 3 things happen when you heat something?
the amount of energy the particles have increases, the particles vibrate more, the temperature increases
what is specific heat capacity?
the energy required to change the temperature of 1kg of a substance by 1 degree celsius
what is specific latent heat?
the energy to change the state of 1kg of a substance without changing the temperature
what happens to energy when going from a solid to a liquid to a gas?
energy goes in
what happens to energy when going from a gas to a liquid to a solid?
energy goes out
what happens when you increase the temperature of something?
more energy is given to the particles, thermal energy is converted into kinetic, the particles move faster, the particles collide more, the pressure increases
what is absolute 0?
where the temperature is 0 kelvin or -273 degrees celsius and this shows that nothing can exist at a colder temperature than this
what does increasing the pressure cause?
it causes it to compress
what does ‘doing work on a gas’ mean?
compressing and expanding the gas, so changing the volume
