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20

Across 4. measured variable 7. _______ method 8. used if a chemical is spilled on a person 10. location of no unauthorized experiments 11. used for measuring and mixing chemicals 14. an inert substance 15. variable that is changed 16. technique used to smell chemicals 18. shares electrons 19. electrical charge 20. wash ______ before leaving the lab

Down 1. same as number of protons 2. transfers electrons 3. hard-soled and covered 5. testable explanation 6. used if a person catches on fire 9. read lab instructions ______ going to lab 12. 10 protons = 10 _______ 13. group used as a standard of comparison 17. basic unit