Pre-Discussion Worksheet Week 2.pdf

Pre-Discussion Worksheet Week 2.pdf - Chemistry 109 Fall...

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Chemistry 109, Fall 2017 Pre-Discussion Worksheet 02: Sept 11-15 This worksheet is due at the beginning of discussion in Week 2 (September 11-15). It is worth 3 points. 1. Evaluate which transition has a larger change in energy (enter >, <, = in the space below) using the equation: ∆࠵? #$%& = ࠵? ( − ࠵? * = −2.179×10 234 ࠵? 1 ࠵? ( 8 1 ࠵? * 8 n=6 → n=3 ___ n=4 → n=2 Write a one-sentence explanation of why the transition with the larger difference in n values involves a greater or smaller (whichever you chose) change in energy. 2. Consider the photoelectric effect. When a dim blue light strikes the surface of a metal, electric current is observed in the apparatus shown in Figure 5.5, p 196 in the textbook, but a bright red light does not produce electric current. Briefly explain why this is possible. Include in your explanation the words “photon”, “energy”, and “wavelength”. 3. For a hydrogen atom atomic orbital, n relates to the atomic orbital’s _______ l relates to the atomic orbital’s _______ m l
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