Chemistry Crossword Assignment

1. combination of pure substances.
2. change of state from a solid to a liquid.
3. ability of a substance to conduct electricity or heat.
6. a reaction that takes place when two or more substances react to form new substances.
9. an experiment in which all reactants and all products of a chemical reaction are accounted for.
12. positively charged particle in the nucleus of an atom
13. an experiment in which one or more products of a chemical reaction can escape.
14. mass of one atom of an element calculated from the total number of protons,neutrons ,and electrons of that atom (measured in amu.)
17. substance that reacts with another substance or substances in a chemical reaction to create new substances with different properties.
20. pure substance that cannot be broken down into other substances.
21. Workplace Hazardous Materials Information System; a system of easy-to-see warning symbols on hazardous materials
22. vertical column of elements in the periodic table.
23. invisible negatively charged particle that orbits the nucleus of an atom

1. pure substances formed when non-metals combine.
4. atom that has become electrically charged because it has lost or gained electrons.
5. number of protons in the nucleus of one atom of an element.
7. group 1 elements in the periodic table, not include hydrogen; the most reactive of the metals.
8. group 17 elements in the periodic table; the most reactive non-metals.
10. substance that helps a chemical reaction to proceed more quickly.
11. description of a substance that can be pounded or rolled into sheets.
12. new substance produced in a chemical reaction between reactants.
15. a slow chemical change change that occurs when oxygen in air reacts with a metal
16. horizontal row of elements in the periodic table.
18. a chemical combination of two or more elements in a specific ratio
19. neutral particle in the nucleus of an atom.