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