Chase Tic Tac Toe

1. a substance formed by a chemical reaction
3. a solid substance that forms as a result of a chemical reaction
5. the number of protons in the nucleus
9. the total number of protons and neutrons in the nucleus
11. a negatively charged particle outside of the nucleus
12. a substance that cannot be broken down into a simpler substance by ordinary chemical changes
14. a horizontal row in the table of elements
15. increases chemical reaction but is not itself consumed in the reaction
16. a group of atoms that are held together by covalent bonds
18. a vertical column in the table of elements
20. an atom or group of atoms that have a positive or negative charge
21. denoting a process involving substances in different phases

2. a substance that is present at the beginning of a chemical reaction and is changed into a new substance
3. changes affecting the form of a chemical substance but not its chemical composition
4. law stating that atoms cannot be created or destroyed in a chemical reaction
6. occurs when two substances combine to create a new substance
7. a number written slightly below and to the right of a chemical symbol that shows how many atoms of the element are in a compound
8. an atom of an element that has a different number of neutrons than another atom of the same element
10. a particle inside the nucleus that has no charge
13. a positively charged particle inside the nucleus
15. the number before a chemical formula that indicates how many molecules are involved in a chemical reaction
16. a combination of two or more substances that do not combine chemically
17. substances and mixtures that are in one single phase
19. a substance formed by two or more different types of atoms bonding together