My Chemistry Puzzle

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