Chemistry Crossword

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Across
  1. 4. Homogeneous mixture
  2. 5. A system of easy-to-see warning symbols on hazardous materials
  3. 9. Mass of one atom of an element calculated by total number of protons, neutrons, and electrons of that atom
  4. 11. An element in which its properties are between those of metals and solid nonmetals
  5. 12. substance that helps a chemical reaction to proceed faster
  6. 14. Neutral particle in the nucleus of an atom
  7. 15. Invisible negatively charged particle that orbits the nucleus of an atom
  8. 17. Second group of elements in the periodic table; not as reactive as those in the first group
  9. 19. Positively charged particle in the nucleus of an atom
  10. 20. A chemical reaction that absorbs heat energy
  11. 22. Change of state from a gas to a solid
  12. 24. Chemical combination of two or more elements in a specific ration
Down
  1. 1. Change of state from a solid to a liquid
  2. 2. Pure substance that cannot be broken down into other substances; made up of only one type of atom
  3. 3. Slow chemical change that occurs when oxygen in the air reacts with a metal
  4. 6. Vertical column of elements in the periodic table
  5. 7. Group of atoms joined by covalent bonds
  6. 8. ability of a substance to conduct electricity or heat
  7. 10. Change of state from a gas to liquid
  8. 13. Horizontal row of elements in the periodic table
  9. 16. First group of elements in the periodic table; most reactive of the metals
  10. 18. A chemical reaction that releases heat energy
  11. 21. Group 17 elements in the Periodic Table of Elements; most reactive nonmetals
  12. 23. Catalyst involved in a chemical reactions within living things
  13. 25. Anything that has a mass and occupies space