My Chemistry Puzzle

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