Chemistry Crossword

1. a subatomic particle of about the same mass as a proton but without an electric charge
3. the smallest part of an element
7. mass of one atom of an element calculated from the number of protons, neutrons, and electrons
8. new substance produced in a chemical reaction between reactants
10. a stable subatomic particle occurring in all atomic nuclei,
11. an experiment in which all reactants and all products of a chemical reaction are accounted
12. pure substance when two or more non-metals combine
13. an atom or group of atoms that has become electrically charged because it has lost or gained electrons
14. anything that has mass and occupies space
16. chemical reaction that takes place in cells
17. a reaction that takes place when two or more substances react to form a new substance
18. pure substance that cannot be broken down into other substances
20. number of protons in the nucleus of one atom of an element
21. Workplace Hazardous Materials Information Systems
22. a stable subatomic particle with a charge of negative electricity
23. chemical reaction that occurs when oxygen reacts with a substance to form a new substance and give off energy

2. substance that reacts with another substance or substances in a chemical reaction to create new substances with different properties
4. an experiment in which one or more products of a chemical reaction can escape
5. chemical reaction that absorbs heat
6. fundamental principle that energy cannot be created or destroyed in a chemical reaction
9. a substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change.
13. pure substance formed when at least one metal and non-metal combine
15. a table in which the elements are organized by their physical and chemical properties
16. slow chemical change that occurs when oxygen in the air reacts with a metal
19. chemical reaction that releases heat