Across
- 4. attraction of molecules
- 5. smallest part of a substance
- 7. change does not change composition
- 8. branch of science
- 11. takes up space, weight
- 12. atoms bonded together
- 15. moves heat, work
- 16. come together to make new chemical
- 17. measure matter
- 18. change change composition
Down
- 1. property no chemical change
- 2. sped up, no chemical change
- 3. force that holds atoms together
- 6. releases heat
- 9. substance mixed
- 10. amount of space
- 13. absorbs heat
- 14. one atom, contains protons