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GED Physical Science
Lesson 2 Properties and States of Matter
Term | Definition |
---|---|
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 |