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Chapter 3

TermDefinition
matter Everything that has mass and that takes up space.
Element The ingredients that make up all other Substances. Can't be broken down into other substances.
Metals Good conductors of electricity and heat. Can blend without breaking. Most have a gray color.
Nonmetals Do not conduct electricity or heat very well. May be a gas or a solid.
Semimetals Sometimes like metals and sometimes like nonmetals.
Atom The smallest part of an element that still acts like that metal.
Atomic Theory States that everything is made of atoms.
Compound A type of matter made of two or more elements.
Molecule Smallest particle of a compound that still acts like a compound.
Proton Positive charge. Found in nucleus.
Neutron No Charge. Found in nucleus.
Electron Negative Charge. Orbits the nucleus.
Liquid Definite volume but not shape, particles can move past each other. Takes shape of it's container.
Solid Has a definite shape and volume. Particles are very close together, and don't move past each other. Keeps shape.
Gas No definite volume or shape. Particles spread out evenly and take shape of container. Can be squeezed into smaller volume.
Plasma Like a gas, but conducts electricity like a metal. Occurs with high temps or electric charge.
Melting point When solid to liquid or liquid to solid. Same temperature as freezing point.
Evaporation When liquid becomes a gas.
Condensation When gas becomes a liquid. Gas particles touch a cold surface and the temperature drops.
Created by: Dpm2002
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