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Practice Exam II Fall 2004

Practice Exam II Fall 2004 - CHEM 105 Practice Exam II 1...

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CHEM 105 – Practice Exam II 1) Explain, in terms of the properties of photons (wavelength, frequency and/or energy – you decide which is the most important in this context), why it is acceptable to have a dim red light on in a photographic darkroom, but not any other color light. 2) Calculate the kinetic energy of an electron having the same wavelength as a photon of UV light, given that the UV photon has an energy of 59.8 kJ/mol (that is, 1 mol of photons has a total energy of 59.8 kJ). 3) Give a COMPLETE electron configuration for the halogen in the third row. 4) Give a condensed electron configuration for a neutral Po atom 5) Give a condensed electron configuration for a Manganese atom, and use a box-type diagram to determine if the manganese is diamagnetic or paramagnetic. 6) Give a CONDENSED electron configuration for a palladium (III) ion 11) Provide a correct Lewis Structure, hybridization of the central atom, Electron Group Geometry, Molecular Geometry and whether the molecule is polar or non-polar for each of the following: SbF 3 BrF 2 - 7) Explain whether ICl 2 Br 2 - (with I as the central atom and the Cl’s and Br’s attached to the I) is polar, nonpolar, or whether there is insufficient data to determine whether or not the molecule is polar. Be sure to explain your reasoning. 8) Write a correct Lewis Structure for C 2 -2 , determine the hybridization of the C atoms and determine the number of σ -bonds and the number of π -bonds in the molecule. 9) It is well known that propane (C 3 H 8 ) is a gas at room temperature and atmospheric pressure, whereas isopropyl alcohol (C 3 H 7 OH) is a liquid under these conditions. Use intermolecular forces to explain this. 10) Provide a correct Lewis Structure for the nitrate ion, include all resonance structures and a sketch of the resonance hybrid. 11) O 2 has been proven to be paramagnetic (which means that it has unpaired electrons). In what way does this experimental fact indicate that a flaw in the Lewis Structure model of bonding. NOTE THERE will certainly be other questions on drawing Lewis Structures of large molecules and on phase diagrams. See your HW and quizzes for examples. 1
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12) Give COMPLETE electron configurations for the following: (10 pts) A Cadmium ion A neutral antimony atom 13) Give condensed electron configurations for the following: (10 pts) An astatine atom A Rhodium (IV) ion (also provide a box diagram to indicate the electron spins) 14) A photon impacts a metal surface and causes an electron to be ejected. It requires 3.00x10 -19 J to free the electron from the metal. Assuming that all of the photon’s energy is consumed and that any energy from the photon above that required to free the electron is converted into kinetic energy of the “freed” electron, calculate the energy of the photon in KJ/mol if the wavelength of the ejected electron is 0.500 nm. (15 pts) 15) A well known chemistry demonstration is the glowing pickle. In this demo electric current is passed trough the pickle and the pickle glows with a yellowish-orange light.
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