Activity 2

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Across
  1. 5. a substance that starts a chemical reaction
  2. 7. rate at which energy is used
  3. 9. small amount of energy
  4. 10. study of energy
  5. 13. unit of power
  6. 15. A test that is used to rule out a hypothesis or validate something already known.
  7. 17. the ability to do work
  8. 18. is the smallest particle of an element
  9. 20. A widely accepted hypothesis that stands the test of time.
  10. 22. Where life operates.
  11. 23. The study of the interactions between life and its physical environment.
  12. 24. suggested explanation based on evidence that can be tested by observation or experimentation.
  13. 26. A solution with a pH lower than 7
  14. 28. the outer mantle of the solid earth.
  15. 29. the protective blanket of gases
Down
  1. 1. main element in organic compounds
  2. 2. Latin for knowledge
  3. 3. Developing new knowledge based upon old knowledge.
  4. 4. concentration of hydronium ions in a solution
  5. 6. a pure substance
  6. 8. a substance that forms because of a chemical reaction
  7. 11. is equal to 746 watts (Another measurement of power)
  8. 12. The vast majority of our people directly dependent on the natural resources of their country for their basic needs
  9. 13. done when force is applied to an object over a distance
  10. 14. sum of all the biochemical reactions in an organism
  11. 16. anything that takes up space and has mass.
  12. 19. named after James Prescott Joule
  13. 21. is a substance that consists of two or more elements
  14. 24. comprises all types of water resources
  15. 25. A solution with a pH higher than 7.
  16. 27. stores energy and forms cell membranes