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Chapter 3

TermDefinition
matter everything that has mass and takes up space
element substance made of only one kind of atom
metals good conductors of electricity and heat. Can bend without breaking. Most have a gray color
nonmetals do not conduct heat / electricity very well. May be a gas or solid
semi-metals sometimes like metals and sometimes like nonmetals
atom the basic building block of matter. Can't be any smaller
atomic theory states that everything is made out of atoms
compound a type of matter made of two or more elements
molecule smallest particle of a compound that still acts like that compound
proton positive charge. Found in the nucleus
nuetron no charge. found in the nucleus
electron negative charge. orbits around the nucleus
Solid Has a definite volume or shape. Particles are very close together, and don’t move past each other. Keeps its shape.
Liquid Has a definite volume but not shape. Particles can move past each other. Takes shape of container
Gas No definite volume or shape. Particles spread out evenly and take shape of container. Can be squeezed into a smaller volume
Plasma Like a gas, but conducts electricity like a metal. Occurs with high temps or electric charge.
Melting Point Solid to liquid or liquid to solid. Same temperature as freezing point.
Evaporation When liquids become a gas
Condensation When gas becomes a liquid. Gas particles touch a cold surface and the temperature drops.
Boiling Point The temperature at which evaporation occurs
Created by: willow-brown
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