Chapter 2 Crossword (2)

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Across
  1. 3. is an electrically neutral group of two or more atoms held together by chemical bonds
  2. 5. below 7 on ph scale
  3. 6. chemical bond that involves the sharing of electron pairs between atom
  4. 9. the number of protons found in the nucleus of an atom
  5. 12. an atom or molecule in which the total number of electrons is not equal to the total number of protons
  6. 13. the process of photosynthesis
  7. 17. the central and most important part of an object
  8. 18. solution in which the solvent is water
  9. 19. highly selective catalysts
  10. 21. A good example is the reaction between hydrogen and fluorine
Down
  1. 1. a process that leads to the transformation of one set of chemical substances to another
  2. 2. diatomic anion with chemical formula OH
  3. 4. a body of matter
  4. 7. chemical substance that neutralise acid and a base
  5. 8. A solution in which the maximum amount of solvent has been dissolved
  6. 10. something "manufactured" by an enzyme
  7. 11. is the amount of work that a thermodynamic system can perform
  8. 14. the separation of something from something else
  9. 15. minimum amount of energy that is required to activate atoms or molecules
  10. 16. a liquid mixture in which the minor component
  11. 20. solid,gas,liquid
  12. 22. pure chemical substance