density and internal energy Flashcards
internal energy
the energy stored by the particles of a substance
what is internal energy the sum of?
kinetic energy of the particles + potential energy
heating a substance changes internal energy how?
by increasing the energy of its particles
forces of attraction
strong in solids, holds the rigid structure together
weaker in liquids
nonexistent in gases
when a solid melts
its particles have gained enough energy to break away from the structure
when liquid evaporates…
some particles break away from others,
the molecules that escape are in a gas state above the liqid
gas and pressure
when heated the pressure increases because the particles move faster
density formula
density= mass
———
volume
/ p = m
——
v
conservation of mass:
when a substance changes state, its mass stays the same because the number of particles stay the same
more density=
heavier object
what is density measured in?
kg/m cubed
specific latent heat + equation
energy required to change state from one to another
E = m x L
energy= mass x latent heat
density of irregular objects: eureka can
add water below spout, add object, measure volume of water displaced
density of irregular objects: measuring cylinder
100cm^3 of water, add object, record new volume and find difference
density definition
the mass in a set volume
