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Across 1. PV=nRT 3. ex. atm or mmHg 5. Substances physical appearance changes but can go back to original state 7. Substance cant go back to its original state. 8. two electrons combined together 9. Forms between two non-metals 13. The n in PV=nRT 14. Divsion of a cell into two daughter cells 15. V1xT1=V2xT2 16. single element replaces another element plus a compound 18. A connection between two elements 19. The body of an atom and everything it consists of 22. Negative charged atom 24. Carbon based compound that reacts with O2 to form CO2 and H2O 25. P1xV1=P2xV2

Down 2. cations and anions of two different compounds switch places 4. C+237 6. Single compound breaks down into two or more substances 10. P1/T1=P2/T2 11. The extra electron(s) left over in the lewis dot structure 12. two substances form to make a single substance 17. Positive charged atom 20. Everything in the world is made of ______ 21. Atom with a charge 23. Forms between metal and non-metal