particle model of matter Flashcards
three states of matter:
solid
liquid
gases
SOLIDS
in a solid:
- particles are in a fixed pattern (lattice)
- fixes size & shape
LIQUIDS
in a liquid:
- fixed size
- free to move particles
- change shape
GASES
in gases:
- large gaps between particles
- compressible
- change size & shape
density equation=
Density= mass
————
volume
what happens when energy is added to a system?
when energy is added to a system its temperature will increase
what happens at the melting or boiling point?
At the melting or boiling point,
the energy being added causes a substance changes state not temperature
is a change of state reversible?
yes it is baby
what type of change is a change of state?
A change of state is a PHYSICAL change
- alters the internal energy but not the temperature or mass
equation for change of state =
energy for
change = mass x specific latent heat
of state
what is specific latent heat?
specific latent heat is the energy needed to cause 1 kg of a substance to change its state
what is latent heat of fusion?
Latent heat of fusion is the energy needed for substance to change from solid to a liquid (melt)
What is latent heat of vaporisation?
Latent heat of vaporisation is the energy needed for a substance to change from liquid to gas (evaporate)
what is sublimation?
sublimation is when a substance changes from a solid to a gas without having a liquid phase in the middle
when did sublimation happen?
sublimation happens when substances have a boiling point that is the same or lower than the melting point
