Across
- 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
Down
- 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.