Unit B Crossword- Hudson Cordwell 9S

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Across
  1. 1. Chemical reaction that occurs when oxygen reacts with a substance to form a new substance and give off energy
  2. 3. Change of state from a liquid to a gas
  3. 6. Change that results when two or more substances react to create a different substance or substances
  4. 8. Orbit of electrons around the nucleus of an atom
  5. 11. An experiment in which all reactants and all products of a chemical reaction are accounted for
  6. 15. Number of protons in the nucleus of one atom of an element
  7. 18. Principle that matter is not created or destroyed in a chemical reaction
  8. 20. A system of easy to see warning symbols on hazardous materials
  9. 22. Group of atoms joined by covalent bonds
  10. 23. Group of atoms atoms acting as one
Down
  1. 1. Change of state from a gas to a liquid
  2. 2. Catalyst involved in chemical reactions in living things
  3. 4. Group 1 elements in the periodic table, not including hydrogren
  4. 5. Group 2 elements in the periodic table
  5. 7. The most reactive non-metals
  6. 9. Slow chemical change that occurs when oxygen in the air reacts with a metal
  7. 10. Change of state from a solid to a liquid
  8. 12. Anything that has mass and occupies space
  9. 13. Mass of one atom of an element calculated from the total number of protons,neutrons, and electrons of that atom
  10. 14. A solution in which water is the solvent
  11. 16. The most stable and unreactive elements
  12. 17. Cloudy mixture in which tiny particles of one substance are held within another and particles cannot be separated from the other substance
  13. 18. Combination of symbols that represent a compound
  14. 19. The smallest part of an element that is representative of that element
  15. 21. Chemical combination of two or more elements in a specific ratio