Across
- 3. the smallest unit of an element
- 6. A positively charged particle in the atom
- 11. The variable that we change
- 13. the protein factory in the cell
- 17. the ability of one substance to dissolve in another
- 18. the variable that changes because of what we change
- 20. a scientific or educated guess
- 21. cannot be separated or broken down by chemical means
- 22. the name for parts of cells
- 23. The control center of the cell
- 24. shiny conduct heat and electricity
Down
- 1. reduces the activation energy energy for a reaction
- 2. the first step in the scientific method is to state the blank
- 4. has a definite shape and volume
- 5. do not react with other elements
- 7. an example of a chemical property
- 8. something that changes
- 9. negatively charged particles surrounding the nucleus of the atom
- 10. the ability to be rolled or pounded into sheets
- 12. provides shape and structure to plant cells
- 14. properties that can be observed or changed without changing the identity of the matter
- 15. something that stays the same
- 16. the site of photosynthesis in plant cells
- 18. the ability to be drawn into wires
- 19. particles with no charge in the atom