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25 terms

Chapter 2 Changes in Matter

Prentice Hall Science Explorer Chemical Building Blocks 8th grade
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solid
A state of matter that has a definite volume and a definite shape.
crystalline solid
A substance that is made up of crystals in which particles are arranged in a regular, repeating pattern.
amorphous solid
A solid made up of particles that are not arranged in a regular pattern.
liquid
A state of matter that has no definite shape but has a definite volume.
fluid
Any substance that can flow.
viscosity
The resistance of a liquid to flowing.
gas
A state of matter with no definite shape or volume.
temperature
A measure of the average energy of the particles of a substance.
pressure
The force pushing on a surface divided by the area of that surface.
Boyle's Law
The relationship between the pressure and volume of a gas; when volume increases, pressure decreases.
Charles' Law
The relationship between the temperature and volume of a gas; when temperature increases, volume increases.
graph
A diagram that shows how two variables are related.
directly proportional
A term used to describe the relationship between two variables whose graph is a straight line passing through the point (0,0)
vary inversely
A term used to describe the relationship between two variables whose graph forms a curve that slopes downward.
thermal energy
The total energy of a substance's particles due to their movement or vibration.
chemical energy
A form of energy that comes from chemical bonds.
Law of Conservation of Energy
The principle that the total amount of energy remains the same during physical or chemical change.
melting
The change in state from a solid to a liquid.
freezing
The change in state from a liquid to a solid.
vaporization
The change of state from a liquid to a gas.
evaporation
The process that occurs when vaporization takes place only on the surface of a liquid.
boiling
The process that occurs when vaporization takes place inside a liquid as well as on the surface.
condensation
The change of state from a gas to a liquid.
sublimation
The change in state from a solid directly to a gas without passing through the liquid state.
chemical reaction
A process in which substances undergo chemical changes, formatting new substances with different properties.