Chemistry Crossword

1. change of state from solid to liquid
2. invisible negatively charged particle that orbits the n
4. positively charged center of an atom; contains protons and neutrons
5. liquid or paste that conducts electricity because it has ions
6. a reaction that takes place when two or more substances react to form new substances
10. substance made up of only one atom
11. positively charged particle in the nucleus of an atom
12. group of 18 elements in the periodic table;they are the most stable and unattractive elements
14. anything with mass and that occupies space
16. conductor through which electric current enters or leaves a device or material
17. a chemical reaction that releases energy
18. group 17 elements in the periodic table’;the most reactive non-metals
19. neutral particle in the nucleus of an atom
21. shiny malleable,ductile element that conducts electricity

1. description of a substance that can be pounded or rolled into sheets
3. change of state from a solid to a gas or a gas to a solid
6. an experiment in which all reactants and all products of a chemical reaction are accounted for
7. group of atoms joined by covalent bonds
8. a chemical reaction that absorbs energy
9. an experiment in which one or more products of a chemical reaction can escape
12. dull brittle element that does not connect electricity
13. change of state from a liquid to a gas
15. element that has both metallic and nonmetallic properties
20. catalyst involved in chemical reactions in living things