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science 3.0 chapter
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 bendwithout breaking. Most have a gray color |
non-metals | Do not conduct heat / electricity very well. May be a gas or a solid |
semi-metals | 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 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 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 |