Periodic Table

3. A materical that increases the rate of a reaction by lower the activation energy.
4. When two or more elements or compounds combine to make a more complex substance.
5. The study of matter and how matter changes.
7. A reaction in which energy is absorbed.
13. Anything that has mass and takes up space.
15. A neutral group of atoms joined by covalent bonds.
16. The substance you have at the beginning.
17. A covalent bond in which electrons are shared unequally.

1. A mixture made of two or more elements.
2. An atom or group of atoms that has an electric charge.
3. A change in matter that produces one or more new substances.
5. Is a characteristic of a substance that describes its ability to change into other substances.
6. Any change that alters the form or apperance of a substance but dosen't make the substance into another substance.
7. A reaction that releases energy in the form of heat.
8. Breaks down compounds into simpler products.
9. A combination of symbols that shows the ratio of elements in a compound.
10. The attraction between two postivly charged ions.
11. A covalent bond in which elements are shared eqaully.
12. The cells in your body contain biological catalyst.
14. When ions form an orderly three dimensional arrangement.