Chemistry Crossword

2. Positively charged particle in the nucleus of an atom
3. Chemical reaction that occurs when oxygen reacts with a substance to form a new substance that gives off energy
5. A material changes from one state to another
7. Chemical reaction that takes place in cells
9. Measured by atomic mass unit
10. The most reactive of the metals
11. Two or more materials react and create a new substance
12. Horizontal row of elements in the periodic table
13. Invisible negatively charged particle that orbits the nucleus of an atom
14. The most stable and unreactive elements
16. Catalyst involved in chemical reactions in living things
17. Pure substance formed when non metals combine
21. Solid liquid gas and plasma
23. Slow chemical change that occurs when oxygen in the air reacts with a metal
24. Element that has both metallic and non metallic properties

1. An experiment in which one or more products of the chemical reaction can escape
3. The law that states that matter is not created or destroyed in a chemical reaction
4. Combination of symbols that represent a compound
6. The fourth state of matter
8. Pure substance formed when at least one metal and one non metal combine
15. The most reactive non metals
18. An experiment where all reactants and products of a chemical reaction are accounted for
19. Substances that help a chemical reaction to proceed more quickly
20. Vertical column of elements in the periodic table
22. Neutral particle in the nucleus of an atom