7th Grade Unit 2 Lesson 1 Water and Its Properties

atom

Smallest particle of an element and the basic unit of matter

molecule

two or more atoms held together by chemical bonds

polarity

property of a molecule with oppositely charged ends; because of this property, water behaves in predictable ways

solid

State of matter that has a definite shape and volume; particles hold together and vibrate in place

liquid

the state of matter that has a definite volume but not a definite shape; particles stay close but can slide past each other

gas

a state of mater with no definite volume or shape; particles move quickly and fill available space

cohesion

Attraction between molecules of the SAME substance (ex. water to water)

adhesion

attraction between molecules of DIFFERENT substances

specific heat

the heat required to raise the temperature of the unit mass of a given substance by a given amount (usually one degree)

solvent

a liquid capable of dissolving other substances

dissolve

to form a solution by mixing evenly between particles of another substance

saturation

occurs when no more of something can be absorbed, combined with, or added