Ch 9 What Matter is Made Of Flashcards
what is matter
anything that takes up space and has a mass
what is mass
a measure of the amount of matter in an object
what are the three states of matter
solid, liquid, gas
what is the particle theory
scientists still believe that everything is made from very small particles in
explain the particles during the solid state
- tightly packed together
- vibrate on the spot
explain the particles during the liquid state
- very close together
- can move around and slide past each other
explain the particles during the gas state
- spread out
-
what is diffusion
the spreading out of particles to fill the space they are in
what are the three factors that affect diffusion
- temperature
- size of particles
- state of the diffusing substance
what is melting
when a solid changes to a liquid
what is boiling
when a liquid turns into a gas
what is a physical change
a physical change is when no new substance is formed, there is no change in mass and the reaction can be easily reversed
what is a melting point
the temperature a substance melts at e.g. ice melts at 0
what is freezing
when a liquid changed into a solid e.g. waters freezing point is 0
what is evaporation
when the particles from a liquid with the most energy leave the surface, spread out and form a gas
