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  1. 3. * Energy is the energy in the nucleus of the atom.
  2. 6. Where life operates.
  3. 9. * Energy is often measured in calories.
  4. 10. Is anything that takes up space and has mass.
  5. 12. Provides energy to cells.
  6. 15. The protective blanket of gases surrounding the Earth.
  7. 16. Electrical energy is generally expressed in * hours.
  8. 17. Helps cells keep their shape.
  9. 19. The act of noting or detecting phenomenon by the senses.
  10. 20. The study of the interactions between life and its physical environment.
  11. 21. A suggested explanation based on evidence that can be tested by observation or experimentation.
  12. 24. James * Joule
  13. 25. The * energy of an object is the energy that it possesses due to its motion.
  14. 26. Stores energy and forms cell membranes.
  15. 27. The energy needed to start a chemical reaction is called * energy.
Down
  1. 1. It is needed by all life forms.
  2. 2. A solution with a pH higher than 7.
  3. 4. Is the ability to do work.
  4. 5. The sum of all the biochemical reactions in an organism.
  5. 7. A solution with a pH lower than 7.
  6. 8. Is the unit of power.
  7. 9. Thermal or * Energy
  8. 11. A substance that starts a chemical reaction.
  9. 12. "Energy cannot be * or destroyed.
  10. 13. Is the rate at which energy is used.
  11. 14. Is done when force is applied to an object over a distance.
  12. 17. A substance that forms as a result of a chemical reaction.
  13. 18. Is the study of Energy.
  14. 22. A chemical substance may be either an * or a compound.
  15. 23. the concentration of hydronium ions in a solution.