1 / 19

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

jackie
Download Presentation

Writing Formulas

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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!

More Related