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GED Physical Science

Lesson 2 Properties and States of Matter

matter anything that has mass and takes up space
mass the amount of matter something contains; the mass of an object never changes
weight a measure of the gravitational force exerted on it; the weight of an object can differ (earth vs. moon's gravitational pull)
states of matter generally are three of these, consisting of solids, liquids, and gases; can change states by adding or removing heat
solids have a definite shape and volume because the molecules of which they are made occupy fixed positions and do not move freely
liquids have a definite volume but no definite shape because the molecules are loosely bound and move freely; these take the shape of their container
crystal a solid in which the molecules form an orderly pattern
gases have no definite shape or volume; the attraction between the molecules is very weak; molecules are far apart and are always in motion, colliding with one another and with the sides of the container
melting point the temperature at which a solid becomes a liquid
boiling point the temperature at which a liquid becomes a gas
condensation point the temperature at which a gas becomes a liquid
freezing point the temperature at which a liquid becomes a solid
solution a mixture that is uniform throughout and that contains ions, atoms, or molecules of two or more substances
solute the substance in a solution that is dissolved
solvent the substance in which the solute is dissolved (water is considered a universal solvent because so many substances dissolve in it)
alloy a solid solution made of two or more metals
Created by: jpiittmann