particle model of matter Flashcards
define density
how much mass something has per unit of its volume
what is the equation for density
density = mass/volume
what are the states of matter in order of density of atoms (least to most) and what does this depend on
gas, solid, liquid
depends on the spacing of the atoms
what does it mean by mass is conserved during state changes
if 20g of liquid evaporates, 20g of gas will be present
draw a diagram or explain state changes
melting evaporating
solid liquid gas
freezing condensing
solid to gas - sublimation
why are they chemical changes
the material can return to its original property
what is internal energy and what forms of energy does this take
energy which is stored by particles within a system
kinetic energy
potential energy
what happens when you heat a system
increases the energy the particles have this increases the internal energy
this either raises the temperatures of the system or produces a change of state
what three factors determine the temperature change of a system
- mass of the substance being heated
- type of material
- energy inputted into the system
what is specific heat capacity
the amount of energy needed to raise 1kg or a substance by 1 degree
define temperature
a measure of the average internal energy of all the particals
what happens when something gets heated
it gains more internal energy therefore raises the temperature
what is internal energy
all the energy stored by the particles
what is specific latent heat
the amount of energy needed to change 1kg of substance from one state to another without a change in temperature
what is the specific latent heat of vaporisation
energy change when a substance changes between liquid and gas
