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Grade 8 Chapter 2

Chemical Building Blocks Vocabulary

QuestionAnswer
solid an object with a definite shape and definite volume
liquid no definite shape; definite volume
gas no definite shape; no definite volume
fluid a substance that flows; a liquid or a gas
crystalline solid the particles form a regular, repeating pattern; has a distinct melting point
amorphous solid particles are not arranged in a regular patter; no distinct melting point
temperature a measure of the average energy of motion of the particles in a substance
pressure force divided by area
kilopascals unit of pressure
Boyle's Law when the pressure of a gas increases, its volume decreases
graph diagram that tells how two variables are related
directly proportional when two variables pass through the (0,0) point on a graph
vary inversely when two variables on a graph form a downward curve close to the vertical axis.
physical change alters the form of a substance, but does not change it to another substance
chemical change substance is changed into a different substance with different properties
thermal energy energy from the movement of particles
chemical energy energy from the chemical bonds within matter
Law of Conservation of Energy Energy can change from one form to another, but energy can never be lost.
melting change in state from a solid to a liquid
freezing change of state from liquid to solid
vaporization liquid water changing into water vapor
evaporation vaporization that takes place on the surface of a liquid
boiling vaporization that takes place inside a liquid and at the surface
condensation occurs when a gas loses enough thermal energy to become a liquid
sublimation occurs when a solid changes into a gas without passing through the liquid state
chemical reaction chemical change
viscosity the resistance of a liquid to flowing
Created by: Dcoleman