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chapter 3
Question | Answer |
---|---|
matter | everything that has mass and takes up space |
elements | substances. that cant be broken down into other things |
metals | good conductors of electricity. can heat without heating. most are grey ad shiny |
nonmetals | do not conduct heat / electricity very well. may be a gas or a solid. |
sentimetals | 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 neucleus |
neutron | no charge. found in the neucleus |
electron | negative charge. orbits the neucleus |
solid | has a definite shape and volume. particles are very close together,and don't move past each other. keeps shape. |
liquid | definite shape and volume. particles can move past each other. and don't 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 |