| A | B |
|---|
| density formula | mass/volume, amount of something in a certain amount of space |
| freezing point of water | 0 degree C, 32 degrees F |
| chemical change | changing the actual substance |
| physical change | change in appearance |
| atom | smallest part of an element; name made up by Greeks |
| element | purest substance, not able to be broken down into simpler substances |
| positive subatomic particle | proton |
| negative subatomic particle | electron |
| neutral subatomic particle | neutron |
| two things you can tell by the electron's placement | its energy and attraction to the positively charged nucleus |
| number of protons equals the..... | number of electrons |
| Bohr | created energy levels on which electrons circle the nucleus |
| Rutherford | named the nucleus; said nucleus is full of protons |
| Thomson | said the atom is composed of protons and electrons intermixed like an M and M cookie |
| isotope | atoms of the same element with the same number of protons but different number of neutrons |
| atomic mass | number of protons plus number of neutrons, an average of isotopes (that's why it's a decimal) |
| quark | supposed smaller particle than a subatomic particle |
| mass number | the number of neutrons plus protons for only one isotope |
| two or more elements combined chemically; cannot be separated by physical means | compound |
| numbers in lower right hand corner of an element which tell you how many atoms of the element are in the compound | subscript |
| numbers you can play around with that proceed a compound to balance the equation | coefficients |
| the final result in a chemical equation | product |
| the elements entering the chemical equation | reactants |
| the arrow in a chemical equation means | yields |
| atomic number | the number of protons in the nucleus of an atom |
| concentration | very dense; as much matter that can be condensed into a single area |
| solvent | what is doing the dissolving in a solution |
| solute | what is actually being dissolved in a solution |
| dilute | less concentrated; broken down |
