1. (a) the (4n + 2) rule is often used to predict aromaticity (benzene is an example where nfor the molecule shown below (azulene) n-2. use the particle in a ring model to predict theenergies of the delocalized electrons in azulene, and hence predict the wavelength of lightabsorbed by this moleculeuse a bond length of 138 pmthe experimental absorbance of this compound is at 340 nm your value should be close to this. canyou think of reasons why your value is not exact? (b) what does "particle in a ring" say about the distribution of electron density in the delocalizedsystem? (c) can you think of reason(s) why [8jannulene (cyclooctatetraene) and [10]annulene(cyclodecapentaene) are not aromatic?

After cloud droplets form, what must happen to them for precipitation to occur?

You mix the pks of succinic acid are 4.21 and 5.64. how many gramsa graduate student at sdsu wants to measure the activity of a particular enzyme at ph 4.0. to buffer her reaction, she will use a buffer system based on one of the acids listed below, which acid is most appropriate for the experiment? of monosodium succinate (fw = 140 g/mol) and disodium succinate (fw = 162 g/mol) must be added to 1 l of water to produce a solution with a ph 5.28 and a total solute concentration of 100 mm? (assume the total volume remains 1 liter, answer in grams monosodium succinate, grams disodium succinate, respectively.) volumes of 0.05 m nah2po4 and 0.05 m na2hpo4 (pk's for phosphoric acid are 2.15, 6.82 and 12.38). which of the following best describes the resulting solution?

Draw the structure for 5-isopropyl-2-methyl-3-nonene