Materials Flashcards
define matter
anything which occupies space.
properties of solids
definite shape volume hard to compress don’t flow
properties of liquids
no definite shape definite volume hard compress
properties of gases
no definite shape no definite volume. Easy to compress
Particle arrangements of liquids
more freedom of movement and slide over each other
Particle arrangement in solids
fixed position
can vibrate
strong force
move slowly
melting point
the temperature at which a solid changes to a liquid
sublimation
solids that change directly from a solid to a gas when heated
why is it easier to compress gas
there is more space between the particles: in liquid the particles are already close to each other
define diffusion
the spreading out of materials because of the movement of the particles
measure the melting point of a solid
seal one end of a melting point tube by holding it in a Bunsen burner
-benzoic acid in a melting point tube
- melting point tube in aluminium melting point block
- aluminium melting point block on hot plate heated
- note the temperature of when the benzoic acid changes to a colourless liquid from a digital thermometer connected to the melting point tube.
evaporation
the changing of liquid to gas at the surface of the liquid
Particle arrangement in gas
father apart than in liquid
continuously moving around in all available space
weak force
particles move quickly :this is why they disfuse
boiling point
the temperature at which a liquid changes to a gas throughout the liquid
condensation
the changing of gas to a liquid; when a gas is cooled the particles slow down
