Science

1. The force that holds atoms together in a molecule.
3. The amount of matter in an object.
7. The smallest unit of an element that still has the properties of that element.
9. A characteristic that describes how a substance behaves (e.g., flammability or rusting)
11. The number of protons in the nucleus of an atom.
12. When a chemical equation shows the same number of atoms of each element on both sides (reactants and products).
14. States that matter cannot be created or destroyed; it stays the same.
15. Two or more atoms held together by chemical bonds.
16. What something is made of; the parts or ingredients.
19. A combination of two or more substances that are not chemically combined.
20. A process in which substances change into new substances.
21. A mixture where the parts are not evenly mixed.

2. A mixture that is evenly mixed and looks the same throughout.
4. Anything that has mass and takes up space.
5. The big numbers placed in front of chemical formulas to balance equations, indicating the number of molecules involved.
6. A change that forms one or more new substances.
8. A pure substance made of only one kind of atom.
10. When two or more things are put together, but not necessarily chemically combined.
13. A pure substance made of two or more elements chemically combined.
17. The principle that matter is neither lost nor gained during a chemical change.
18. A set of symbols that shows the elements in a substance and the ratio of their atoms (example: H2O).