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Chapter 3
Term | Definition |
---|---|
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 |