Term | Definition |
solid | definite shape and volume with tightly packed particles that vibrate slowly |
liquid | definite volume but no definite shape with particles closely packed, but freely moving |
gas | no definite shape or volume with particles that are moving very fast, spreading apart |
crystalline solid | particles are arranged in a regular, repeating pattern, ex- snow, salt, and sugar |
amorphous solid | particles are not arranged in a regular pattern, ex- rubber, glass, and plastic |
fluid | any substance that flows, ex- liquids and gases |
surface tension | the result of the inward pull amoung molecules that brings the molecules on the surface closer together |
viscosity | a liquids resistance to flowing |
melting | a solid turning into a liquid as it gains heat energy |
freezing | a liquid turning into a solid as it loses heat energy |
condensation | a gas turning into a liquid as it loses heat energy |
vaporization | a liquid turning into a gas as it gains heat energy |
sublimation | a solid turning into a gas as it gains heat energy |
evaporation | vaporization that occurs on the surface of a liquid |
boiling | vaporization that occurs both on and below the surface |
melting point | the temperature at which a substance changes from a solid to a liquid |
freezing point | the temperature at which a substance changes from a liquid to a solid |
boiling point | the temperature at which a liquid boils |
chemistry | the study of the properties of matter and how they change |
element | a pure substance that cannot be broken down by physical or chemical means |
atom | the basic particle that makes up all elements |
chemical bond | an attraction between two atoms |
molecule | two or more atoms chemically bonded together |