Across
- 5. A procedure carried out to verify, refute, or validate a hypothesis.
- 7. A push or pull that can cause a change in motion.
- 10. A proposed explanation for a phenomenon that can be tested.
- 11. The basic structural and functional unit of all known living organisms.
Down
- 1. A substance that cannot be broken down into simpler substances by chemical means.
- 2. The basic unit of a chemical element.
- 3. A process that involves the rearrangement of the molecular or ionic structure of a substance.
- 4. A well-substantiated explanation of some aspect of the natural world, based on a body of facts that have been repeatedly confirmed through
- 6. A substance formed when two or more elements are chemically combined.
- 8. A group of two or more atoms held together by chemical bonds.
- 9. A measure of the amount of matter in an object.
- 12. A statement based on repeated experimental observations that describes some aspects of the universe.