Across
- 3. chemical rule that reflects observation
- 6. way of presenting information about chemical proportions of atoms
- 10. Co
- 11. NaF
- 12. CaS
- 13. substance that is not conductive
- 17. Hg0(s)-->Hg(1)+Oz(g)
- 18. H20 forms only between atoms of nonmetals
- 19. positively charged ion
- 20. 14 electrons
- 22. A12S3
- 23. single element reacts with a compound
- 24. substance that takes part in and undergoes change during a reaction
- 25. S50
- 28. A+B-->AB
- 29. group of atoms bonded together
- 30. total energy of an isolated system remains constant
- 31. 4 electrons
Down
- 1. formed by chemical reactions species
- 2. forces that hold atoms together
- 4. AB+CD-->CB+AD
- 5. contains 7 valence electrons
- 7. 42
- 8. 51
- 9. representation of a chemical reaction in the form of symbols
- 14. NaC1
- 15. negatively charged ion
- 16. (2H2(g)+0z(g)-->(02(g)+H20(1)
- 21. temperature of which a given solid will melt
- 26. 1s^2 2s^2 2p^3
- 27. substance that conducts electricity when dissolved in water
- 32. an atom or molecule with an electric charge