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 substances |
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 gas or solid |
Semi-metals (metalloid) | sometimes like metals and sometimes like nonmetals |
Atom | the smallest part of an element that still acts like an element |
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 that compound |
Proton | Positive charge. Found in the nucleus |
Neutron | No charge. Found in the nucleus |
Electron | Negative charge. Orbits 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 gas. |
Condensation | When gas become a liquid. Gas particles touch a cold surface and the temp drops |