chemistry crossword

2. anything that has mass and occupies space
5. number of protons in the nucleus of one atom of an element
8. change in the appearance or state of a substance that does not change the composition
11. a combination of symbols that represent a compound
13. a chemical reaction that takes place in cells
16. material that cannot be broken down into any simple substance
17. a table in which the elements are organized by their physical and chemical properties
22. an experiment in which all reactants and products of a chemical reaction are accounted for
23. horizontal row in the periodic table
24. cloudy mixture in which tiny particles of one substance are held within another and particles cannot be separated out from the other substances

1. chemical reaction that releases energy
3. vertical columns in the periodic table
4. a reaction that takes place when two or more substances react to form new substances
6. pure substance formed when non metals combine
7. workplace hazardous materials information system
9. positively charged particle in the nucleus of an atom
10. substances that help a reaction proceed faster
12. chemical reaction that absorbs energy
13. change that results when tow or more substance react to create a different substance or substances
14. substance made of only one kind of matter, which has a unique set of properties
15. an experiment in which one or more products of a chemical reaction can escape
18. change of state from a liquid to a gas
19. chemical reaction that occurs when oxygen reacts with a substance to form a new substance an give off energy
20. when two or more elements combine chemically
21. atom that has become electrically charged because it has lost or gained electrons