| A | B |
|---|
| Subscript | Number of atoms in a molecule |
| Coefficient | Number of molecules |
| Product | Ending materials |
| Reactant | Starting Materials |
| Proton | A positively charged particle in nucleus |
| Valence Electron | Electrons in the outermost energy level; determine reactivity |
| Periodic Table | list of elements arranged by atomic number |
| Physical Property | description of substance that can be observed using senses or measurement |
| Period | Rows on periodic table that determine # energy levels |
| Reactivity | Tendency or "willingness" of a substance to react with other substances |
| Mass | The amount of matter contained in an object or substance |
| Electron | Negative subatomic particle outside the nucleus |
| Nucleus | center of the atom |
| Electron Cloud | The area arouond the nucleus of an atom where electrons can be observed |
| Group | Column on periodic table; determine number of valence electrons |
| Law of Conservation of Matter | The mass of all reactants must equal the mass of all products plus any reamining reactants must also equal 5 grams |
| Chemical Equation | represents a chemical reaction using symbols and formulas |
| Neutron | Subatomic particle in the nucleus; neutral (no charge) |
| Physical Change | When matter changes size, shape, or form |
| Chemical Change | Can only be observed by changing the substance into something new (ex: flammability and reactivity) |
