Atoms, Elements, Compounds & Molecules

1. a sign (arrow) that separates the reactants from the products in a chemical equation
4. the molecule(s) that react in any chemical reaction
6. two or more substances combined, but not chemically (only physically)
7. the simplest type of pure substance that cannot be broken down any further
8. a number that comes before a molecule and tells how many total molecules there are
12. a shorthand way of representing the name or a molecule or compound
14. two or more atoms, of different elements only, chemically combined

2. a reaction that absorbs (uses) heat, the temperature decreases
3. a substance made up of only one type of particle (ex: elements and compounds)
5. a shorthand way of representing the name of an element
6. two or more atoms, of the same or different element, chemically combined
9. a reaction that releases (gives off) energy in the form of heat, the temperature increases
10. the new molecule(s) that are produced after a chemical reaction takes place
11. a small number to the lower right of a chemical symbol that tells how many atoms there are for an element
13. the smallest part of an element that has the properties of the element