Term | Definition |
Matter | everything that has mass and 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 bend without breaking. Most have a gray color |
Nonmetals | do not conduct heat and electricity very well. May be a gas or solid |
Semimetals | sometimes like metals and sometimes like nonmetals |
Atom | the smallest part of an element that still acts like that element |
Atomic Theory | states that everything is made of atoms |
Compound | a type of matter made of two or more elements |
Molecule | smallest part of a compound that still acts like that compound |
Proton | positive charge. Found in the nucleus |
Neutron | no charge. Found in the nucleus |
Electron | negative charge. Found on the outside of the nucleus |
Solid | Has a definite shape and volume. Particles are very close together,
and don’t move past each other. Keeps shape. |
Liquid | 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 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 temp as freezing point. |
Evaporation | When liquids become a gas. |
Condensation | When gas become a liquid. Gas particles touch a cold surface and the
temperature drops |