chemistry crosswords

4. negatively charged atom particle that is part of an atom
5. is a system easy-to-see warning symbols and hazardous materials
6. element that both metallic and non-metallic properties
8. the new material that is produced from the reaction
9. a reaction that takes place when two or more substance react to form new substances
11. CHANGE that results when two or more substance react to create a different substance or substances
14. group of of atoms joined by bonds
16. dull, brittle element that does not conduct electricity
17. solid to a liquid
20. a chemical reaction that releases heat energy
22. the starting a material of a reaction
23. matter can exist as solid and liquids and gases

1. chemical combination of two or more elements in specific ratio
2. is something that has mass and occupies space
3. change in the appearance or state of a substance that does not change the composition
4. liquid to a gas
7. liquid to a solid
10. number of protons in an atom of a nucleus
11. a substance that speeds up a chemical reaction
12. a chemical reaction that absorbs heat energy
13. gas to a liquid
15. atom that has become electrically charged because it has lost one or gained electrons
18. a pure substance that can't be broken down into more atoms
19. a catalyst to break down food
21. shiny, malleable,conductive material, and ductile