Across
- 4. concentration of hydronium ions in a solution
- 5. a substance that starts a chemical reaction
- 7. rate at which energy is used
- 8. done when force is applied to an object over a distance
- 9. A solution with a pH lower than 7
- 10. is the smallest particle of an element
- 12. the ability to do work
- 13. main element in organic compounds
- 16. A widely accepted hypothesis that stands the test of time.
- 17. named after James Prescott Joule
- 18. a pure substance
Down
- 1. Developing new knowledge based upon old knowledge.
- 2. a substance that forms because of a chemical reaction
- 3. suggested explanation based on evidence that can be tested by observation or experimentation.
- 6. A test that is used to rule out a hypothesis or validate something already known.
- 11. sum of all the biochemical reactions in an organism
- 13. is a substance that consists of two or more elements
- 14. A solution with a pH higher than 7.
- 15. anything that takes up space and has mass.