practicefinal2007fall

practicefinal2007fall - PRACTICE FINAL EXAM: CHEM 20A-1,...

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1 PRACTICE FINAL EXAM: CHEM 20A-1, December 8, 2007 1. A mixture of iron (Fe) and aluminum (Al) weighs 9.62 g. The sample is reacted with an excess of HCl and produces 0.738 g of H 2 according to the reactions 2 Al + 6 HCl = 2 AlCl 3 + 3 H 2 Fe + 2 HCl = FeCl 2 + H 2 How much iron was present in the original mixture? 2. Consider the ionic diatomic LM whose dipole moment is 8.0 debye (D) and whose bond length is 2.02A. What is the percent ionic character of this bond? 3. Consider two hydrogen nuclei (protons), separated by 1A along the z-axis; suppose one is at the origin, with coordinates (x, y, z) = (0, 0, 0), and the other is at the point (0, 0, 1A). a. What is the force acting on each proton, due to the other proton? b. Now suppose we put an electron at the position (1A, 0, 1A). What is the net force on each proton, along the internuclear axis? (IT WILL BE HELPFUL TO DRAW AN x,y,z COORDINATE SYSTEM, SHOW THE POSITION OF EACH PARTICLE, AND DRAW FORCE VECTORS AND THEIR PROJECTIONS ALONG THE INTERNUCLEAR AXIS.) (BE SURE TO SHOW THE
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practicefinal2007fall - PRACTICE FINAL EXAM: CHEM 20A-1,...

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