Across
- 7. rate at which energy is used
- 9. the outer mantle of the solid earth
- 10. the act of noting or detecting phenomenon by the senses
- 12. a pure substance
- 14. a solution with a pH higher than 7
- 16. unit of work
- 19. stores energy, forms cell membrane, carries messages
- 21. the concentration of hydronium ions in a solution
- 24. a widely accepted hypotheses
- 25. the ability to do work
- 26. anything that takes up space and has mass
- 27. done when force is applied to an object over a distance
- 28. the study of interactions between life and its physical environment
- 29. a solution with a pH lower than 7
Down
- 1. the main element in organic compounds
- 2. the vast majority of our people directly dependent on the nature resources of their country for their basic needs
- 3. a suggested explanation based on evidence
- 4. comprises all types of water resources
- 5. a substance that forms as a result of a chemical reaction.
- 6. where life operates
- 8. process for developing knowledge
- 11. a substance that starts a chemical reaction
- 13. small particle of an element
- 15. means knowledge
- 17. a test that is used to rule out a hypothesis
- 18. a substance that consists of two or more elements
- 20. method: based on gathering observable empiral and measurable evidence
- 22. developing new knowledge
- 23. the protective blanket of gases surrounding the earth
- 26. the sum of all the biochemical reactions in an organism