Dry Lab 3 Report (Guide)

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Dry Lab 3 Report Sheet Atomic and Molecular Structure Date Lab Sec. Name Desk No. A. The Mercury Spectrum Instructor’s approval of the calibration of the color plate (back cover) B. The Spectra of Elements 1. Spectrum number is the emission line spectrum for hydrogen on the color plate. What are the wavelengths and colors of the emission lines of its visible spectrum? 2. Identi cation of Spectra a. Spectrum number Intense lines in the spectrum: nm; nm; nm; nm; nm; nm; nm Element producing the spectrum b. Spectrum number Intense lines in the spectrum: nm; nm; nm; nm; nm; nm; nm Element producing the spectrum C. Match of Molecule with Infrared Spectrum Complete the following table. Molecule Assigned Atom-in-Bond Arrangements Absorption Bands (cm-1) Infrared Spectrum Figure No. D. Structure of Molecules and Molecular Ions .. .. On a separate sheet of paper, set up the following table (with eight columns) for each of the molecules/molecular ions that are assigned to you/your group. The central atom of the molecule/molecular ion is italicized. Molecule orMolecular Ion | LewisStructure | Valence ShellElectronPairs | Bonding Electron Pairs | Nonbonding Electron Pairs | VSEPR Formula | Approx. Bond Angle | GeometricShape | 1. CH4 | HH C H H | 4 | 4 | 0 | AX4 | 109.5 | tetrahedral | 2. SF4 | | | | | | | | 3. H2O | | | | | | | | 1. Complete the table (as outlined above) for the following molecules/molecular ions, all of which obey the Lewis octet rule. Complete those that are assigned by your laboratory instructor. a. H3O+ d. CH3- g. PO43- j. Si F4 b. NH3 e. SnH4 h. PF3 k. H2S c. NH4+ f. BF4- i. AsH3 l. NH2- 2. Complete the table (as outlined above)

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