Science Crossword Puzzle

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Across
  1. 2. a substance that forms in a chemical reaction
  2. 5. the group in an experiment or study that does not receive treatment by the researchers and is then used as a benchmark to measure how the other tested subjects do
  3. 7. atoms tend to gain, lose, or share electrons to have 8 electrons in their outer electron shell
  4. 8. force that opposes the motion of an object
  5. 10. a substance that enters into and is altered in the course of a chemical reaction
  6. 11. the chemical bonding that results from the attraction between metal atoms and that surrounding sea of electrons
  7. 13. electrons in the outermost electron shell
  8. 14. a push or pull
Down
  1. 1. heat is absorbed
  2. 3. heat is released
  3. 4. matter cannot be created or destroyed in a chemical reaction atoms tend to
  4. 6. Sharing of electron pairs between atoms
  5. 9. a change in velocity
  6. 11. a change in a position over time
  7. 12. the speed of something in a given direction