1 / 11

Transition Metals and Polyatomic Ions Review Guide

Learn about transition metals and polyatomic ions, their charges, naming compounds, and writing chemical formulas using the crossover method. Practice exercises included.

todd
Download Presentation

Transition Metals and Polyatomic Ions Review Guide

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. Chemical Formulas Review Transition Metals and Polyatomic Ions

  2. Transition Metals • Recall: • Transition metals (with few exceptions) form cation with more than one possible charge • Ex: Fe Fe2+, Fe3+; Pb Pb2+, Pb4+ • In ionic compounds, these charge are also their oxidation numbers • We can write balanced chemical formulas by using the cross-over method

  3. Example • A compound containing an Sn2+ ion and a Cl- ion: 1. Sn2+ Cl- 2.Sn2+1Cl-2 3. SnCl2 • Practice! Write formulas that contain the following: Pb4+ ion and O2- ion Cr3+ ion and I- ion

  4. Transition Metals, cont. • Sometimes you will see a Roman numeral in parenthesis written after the name of the metal • This represents the charge/ oxidation number of the ion • Ex: Copper(II) ion  Cu2+ ion

  5. Naming Compounds with Transition Metals • Stock System • Name the metal first • Include the charge of the ion as a Roman numeral in parenthesis immediately after • Name the nonmetal second Ex: CuCl2 copper(II) chloride PbBr4 lead(IV) bromide Practice: HgS Fe2O3 CoF3

  6. Polyatomic ions • Ions that contain more than one atom • Oxyanions- contain oxygen + another nonmetal • Negatively charged/ negative oxidation numbers • Only exception is ammonium (NH4+)

  7. Know These Polyatomic Ions!

  8. Writing Chemical Formulas with Polyatomic Ions • Use the crossover technique • Do NOT change the subscripts of the ions!!! • If the compound contains more than one of that ion, put the ion in parenthesis, and place the subscript outside the parenthesis

  9. Example A compound containing Ca2+ ion and NO3- polyatomic ion • Ca2+NO3- • Ca2+ 1(NO3) -2 • Ca(NO3)2 Practice! Write formulas containing the following: Na+ ion and CO32- ion Mg2+ ion and OH- ion

  10. Naming Compounds Containing Polyatomic Ions • Name metal first (watch out for transition metals!) • Name polyatomic ion second • Only exception is with ammonium- it is always named first

  11. Homework: Due 11-6-2012 Write balanced chemical formulas that contain the following: 1. Cr3+ ion and NO3- ion 2. Li+ and CrO42- ion 3. Sn4+ ion and N3- ion 4. NH4+ ion and PO43- ion 5. Al3+ and CO32- ion • Name the following compounds: • PbMnO4 • NaNO2 • (NH4)3PO4 • MgSO4 • Na2O2

More Related