My Chemistry Puzzle

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Across
  1. 2. polyatomic ions that contain oxygen.
  2. 9. usually has an oxidation number of –2.
  3. 11. are identified simply by the element’s name.
  4. 12. Shows how the atoms in each ion are bonded together.
  5. 14. is a certain type of molecular compound.
  6. 17. is numerically equal to its formula mass.
  7. 18. The mass of a water molecule.
  8. 19. are acids that contain hydrogen, oxygen,and a third element (usually a nonmetal).
  9. 21. consists of the symbols for the elements combined in a compound.
  10. 24. is the actual formula of a molecular compound.
  11. 25. total numbers of positive charges and negative charges must be equal.
  12. 26. showing the smallest whole-number mole ratio of the different atoms in the compound.
  13. 27. is the sum of the average atomic masses of all atoms represented in its formula.
Down
  1. 1. To distinguish the ions formed by such elements.
  2. 3. is often useful to know the percentage by mass of a particular element in a chemical compound.
  3. 4. are acids that consist of two elements,usually hydrogen and a halogen.
  4. 5. can be assigned to atoms in order to keep track of electron. distributions in molecular as well as ionic compounds.
  5. 6. involves combining the names of the compound’s positive and negative ions.
  6. 7. indicates the relative number of atoms of each kind in a chemical compound.
  7. 8. are bound together in a group and carry a characteristic charge.
  8. 10. is numerically equal to its molar mass, so a compound’s molecular formula can also be found given the compound’s empirical formula and its molar mass.
  9. 13. has an oxidation number of +1 in all compounds containing elements that are more electronegative than it but has an oxidation number of –1 with metals.
  10. 15. has an oxidation number of –1 in all its compounds because it is the most electronegative element.
  11. 16. can be written given the identities of the compound’s ions.
  12. 18. Ions formed from a single atom.
  13. 20. An ionic compound composed of a cation and the anion from an acid.
  14. 22. is usually the compound’s empirical formula for ionic compounds.
  15. 23. compounds composed of two elements.