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?

What type of reaction is shown below? check all that apply. 2h2o2 → 2h2o + o2 synthesis decomposition combustion

Straightforward questions answered in the powerpoint slidesreaction: heating the starting materials under refluxwhat does it mean to heat under reflux? why do we choose water as the reflux solvent? what are boiling chips used for? why do we put a condenser on top of the reaction? why do we add heat and let the reaction stir for 30 minutes? why do we add sulfuric acid to the reaction after it cools as opposed to when it’s still hot? separation: filtration of precipitatewhy don’t we do an aqueous and organic extraction in the separatory funnel? why do you rinse the salicylic acid on the filter with ice cold water? purification: recrystallization of salicylic acid (no hot filtration needed)what is the difference in the amount of room temperature water vs. boiling water needed to dissolve the salicylic acid (assume a 1.2 gram yield of salicylic acid)? remember, in the lab if you need x ml of boiling water to dissolve a solid, then you should add a little more (definitely no more than 1.5 times the theoretical amount) to ensure it doesn’t recrystallize prematurely.analysis: melting point of salicylic acidwhat can you conclude if the melting point of the salicylic acid you just synthesized is 152-155oc and the 1: 1 mix of your product and “synthetic” salicylic acid is 151-154oc?

Water's surface tension and heat storage capacity are accounted for by its a) orbitals b) weight c) hydrogen bonds d) mass e) size