| A | B |
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| chemistry | the study of matter and how it changes |
| matter | anything that has mass, occupies space, and has the property of inertia |
| element | a substance that cannot be broken down into simpler substances |
| atom | the smallest particle that has the properties of an element |
| compound | a substances made of atoms of more than one element bound together |
| molecule | the smallest unit of a substance that exhibits all of the properties / characteristic of that substance |
| chemical formula | the chemical symbols and numbers indicating the atoms contained in the basic unit of a substance |
| pure substance | any matter that has a fixed composition and definite properties. |
| mixture | a combination of more than one pure substance |
| Synthesis | Type of chemical equation where two or more elements are joined to form one compound. |
| Decomposition | Type of chemical reaction where one compound breaks down into two or more compounds or elements |
| Single Replacement | Type of chemical reaction where one element switches to join another element |
| Double Replacement | Chemical reaction in which two or more elements switch places in the products |
| Product | The result of a chemical reaction. The materials at the end of a chemical reaction |
| Reactant | The materials at the beginning of a chemical reaction |
| Coefficient | The large number before an element or compound in a chemical reaction |
| Subscript | The small number after an element which tells you how many atoms of that element are present |
| Periodic Table | Table set up to sort the elements |
| John Dalton | First person to come up with an atomic theory |
| Democritus | First person to come up with the idea of atoms |
| Atomos | Greek for Indivisible |
| Nucleus | Center of the atom which holds protons and neutrons |
| Proton | Positively charged subatomic particle |
| Neutron | Subatomic particle with a neutral charge |
| Electron | Negatively charged subatomic particle |
| Electron Shell | Location of the electrons in an atom |
| 2 | The number of electrons in the first electron shell |
| 8 | The number of electrons in the second electron shell |
| 18 | The number of electrons in the third electron shell |
| Atomic Number | Top number on the periodic table which tells the number of protons |
| Atomic Mass | Bottom number on the periodic table which tells the number of protons plus the number of neutrons |
| Physical Change | A change which does not change the atoms of a material |
| Chemical Change | A change in which there is a chemical reaction |
| Physical Property | Melting Point, Boiling Point, Ability to crack or break |
| Chemical Property | The ability to react with water, Flammability, Combustibilty, the ability to rust |
| Valance Shell | The outermost electron shell involved in bonding |
| Octet Rule | says that eight is the stable number of electrons in the valance shell |
