Across
- 3. a well-tested explanation of a phenomenon in the natural world
- 4. _____ = mass/volume
- 6. A possible, testable explanation, educated guess
- 7. ______ number= the number of protons in an atom
- 9. a push or pull that acts on an object
- 11. a point against which motion is measured
- 13. these compounds are made of only two elements
- 15. the state of matter in which a substance has a definite volume
- 16. the substance in a solution that gets dissolved
- 18. the change in an objects velocity over time
Down
- 1. substances that undergo a chemical change
- 2. the smallest unit of a chemical compound, composed of two or more atoms bonded together
- 5. the smallest chemical unit of an experiment
- 8. The gathering of information using senses or instruments
- 10. this reaction type absorbs energy from its surroundings
- 12. for every action there is an _____ and opposite reaction
- 14. this energy type is stored in chemical bonds
- 17. A factor that can change in an experiment