8th Grade Chapter 3 Prentice Hall Vocabulary
Vocabulary from chapter 3 of the 8th Grade Focus on Physical Science Prentice Hall Textbook
Terms in this set (34)
matter that has definite shape and volume
solids that are made of crystals, like salt, sugar and snow
particles that aren't arranged in a regular pattern like plastics rubber and glass
matter with definite volume but no shape it does have a fixed volume
a substance that flows
the result of an inward pull among the molecules of a liquid that brings the molecules on the surface closer together
a liquid's resistance to flowing
matter that can change volume very easily, with no definite volume or shape
the change in state from a solid to a liquid
the temperature at which a substance melts...melting point of water is 0 degrees C....it changes with air pressure
the change from a liquid to a solid
the change from a liquid to a gas
vaporization that takes place only on the surface of a liquid
when a liquid changes to a gas below its surface as well as at the surface
the temperature at which a liquid boils...depends on the pressure of air above it
the reverse of vaporization, the change in state from a gas to a liquid
what occurs when the surface particles of a solid gain enough energy that they form a gas
the force of its outward push divided by the area of the walls of the container...measured in pascals or kilopascals
when a graph of two variables is a straight line passing through the origin
when the product of two variables is a constant
how do you describe the motion of particles in a solid?
particles are closely locked and can only vibrate
how do you describe the motion of particles in a liquid?
particles are more loosely connected and can collide with and move past one another as a result liquid flows and has no definite shape
how can you describe the motion of particles in a gas?
in gases atoms and molecules are free to move independently, colliding frequently
what property of liquids causes water to from droplets?
water molecules attract one another strongly causing the water's surface to be pulled slightly toward the water molecules beneath the surface
what do the different states of matter (solid, liquid, gas) depend on?
molecular motion--any change in thermal energy
why does ice creme melt?
particles of a substance at warmer temperature have more thermal energy than same substance at a cooler temperature.....ice creme absorbs thermal energy from air and hand changing it from solid to liquid
what has more thermal energy? liquid or solid?
Liquid has more thermal energy than same substance in solid form
what happens when a substance melts?
the particles in the solid vibrate so fast they break free from their fixed positions
what happens when something freezes
particles in the liquid move so slowly that they begin to take on fixed positions
what is the freezing point of water?
0 degrees C
what is the melting point of water?
0 degrees C
Why are the melting point and freezing point of water the same?
water is water---it is only a reversible change NOT a chemical change
when does vaporization take place?
when particles in a liquid gain enough energy to move independently forming a gas
what are the 2 main types of vaporization?
evaporation and boiling
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