Pract Prob Set 1A answers - Pract Prob Set 1A ANSWERS Bio61...

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Pract Prob Set 1A ANSWERS Bio61 Geoff Lect 1-4 These are not to be turned in. It is up to you to do them. The answers are either in the Campbell book or will be provided in a few days. 1. Campbell pg 40 #5, 6, 8, 13, --- see answers in book 2. Campbell pg51 #6, 9, 10, 11 see answers in book 3. Campbell pg 60 #7, 12 see answers in book 4.Campell pg 86 # 1, 4, 6, 9, 12 see answers in book 5. Explain why methanol is CH 3 OH, with oxygen having a single bond each to H and C. Oxygen needs 2 electrons to fill its outermost shell (valence 2). C has valence of 4, with single bonds to the 3 Hs and the one oxygen. 6. Mark Myword has been stirring methane (CH4) liquid into water for the last hour but cannot get it to dissolve. However he had no problem getting methanol CH 3 OH to dissolve after minimal stirring. Why? Methane is totally nonpolar and thus its C-H bonds cannot join the H bond network of water. It is excluded and thus stays separate. Methanol has C-O and O-H bonds which are polar bonds with O taking a larger share of the electrons.. Thus, it can join the H bond network by forming hydrogen bonds with water. 7. Explain the type of bonding between an amino group on a molecule that is dissolved in water. If it becomes ionized, how will this change? In an unionized form, the N is electronegative. Thus it can make H bonds with the Hs in water. In the ionized form, the N becomes a cation; thus it cannot form H bonds with the electropositive Hs of water since positives repel each other. 8. Dr. Frank Lee Strange is studying an isotope of nitrogen. Suddenly it changes into a different isotope. What has happened to the atom? A neutron in the nucleus has broken down, giving off some energy. However, it is still nitrogen since it still has the same number of protons as before.
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