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Writing Formulas

Writing Formulas. Oxidation Numbers & Chemical Formulas Mrs. Wolfe. Vocabulary:. Another word for Charge is OXIDATION NUMBER. Is there a pattern of Oxidation Numbers on the Periodic Table?. What is the charge of a Hydrogen ion? + 1 (sometimes –1) Lithium? Also +1

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Writing Formulas

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  1. Writing Formulas Oxidation Numbers & Chemical Formulas Mrs. Wolfe

  2. Vocabulary: • Another word for Charge is OXIDATION NUMBER.

  3. Is there a pattern of Oxidation Numbers on the Periodic Table? • What is the charge of a Hydrogen ion? • + 1 (sometimes –1) • Lithium? • Also +1 • Beryllium? Magnesium? • Both +2 • Fluorine? Chlorine? • Both -1 • There IS a pattern! Let’s write that on our Periodic Tables.

  4. Common Oxidation Numbers +1 0 +2 +3 NA -3 -2 -1

  5. There are some Polyatomic Ions. • Polyatomic Ions – combination of elements WITH A CHARGE! • You will always have a chart of their oxidation numbers on a test/quiz. • HERE COMES A HANDOUT!

  6. We can use oxidation numbers to write formulas.Remember, compounds must be NEUTRAL. Na Cl NaCl 1 1

  7. Ionic Bonds & Formulas • Write each ion, cation first. • Use parentheses to show more than one polyatomic ion. • Roman numerals = transition metal ion’s charge

  8. Practice Problems: • potassium + chlorine • magnesium + nitrate • copper(II) + chlorine  KCl K+ Cl- Mg2+ NO3-  Mg(NO3)2  CuCl2 Cu2+ Cl-

  9. Time for a WS, then Labs! • Qualitative Ion Testing Lab • Formula of an Ionic Compound Lab

  10. Some elements are diatomic.

  11. The SEVEN diatomic elements Br2 I2 N2 Cl2 H2 O2 F2 H N O F Cl Br I

  12. Time for a WS, then GAMES! • Formulas of Compounds WS • Rummy!

  13. Naming Ionic Compounds • Write the names of both ions, CATION first. • Change ending of ANION to -ide. • Polyatomic ions have special names. • Use Roman numerals to show the ion’s charge if more than one is possible. (Transition metals)

  14. Practice Problems • NaBr • Na2CO3 • FeCl3 • sodium bromide • sodium carbonate • iron(III) chloride

  15. Naming Covalent Compounds 1. Less e-neg atom comes first. • Add prefixes to indicate # of atoms. • Change the ending of the second element to -ide.

  16. PREFIX mono- di- tri- tetra- penta- hexa- hepta- octa- nona- deca- NUMBER 1 2 3 4 5 6 7 8 9 10 Molecular Prefixes

  17. Practice Problems • CCl4 • N2O • SF6 • carbon tetrachloride • dinitrogen monoxide • sulfur hexafluoride

  18. Practice Problems • arsenic trichloride • dinitrogen pentoxide • tetraphosphorus decoxide • AsCl3 • N2O5 • P4O10

  19. Let’s do a WS!

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