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?

Note the ph and poh values labeled with letters on the ph scale below. based on log rules and the way ph is calculated, what is the difference in [oh– ] concentration between point a and point b. a) 10^1 b) 10^5 c) 10^6 d) 10^7

Gymnast always perform on padded mats. how does the mats protect the gymnast

Oxidation-reduction reactions (often called "redox" for short) are reactions that involve the transfer of electrons from one species to another. oxidation states, or oxidation numbers, allow chemists to keep track of these electron transfers. in general, one element will lose electrons (oxidation), with the result that it will increase in oxidation number, and another element will gain electrons (reduction), thereby decreasing in oxidation number. the species that is oxidized is called the reducing agent or reductant. the species that is reduced is called the oxidizing agent or oxidant. to sum up: oxidation = increase in oxidation state = loss of electrons = reducing agent reduction = decrease in oxidation state = gain of electrons = oxidizing agent part a which element is oxidized in this reaction? fe2o3+3co→2fe+3co2 enter the elemental symbol. view available hint(s) is oxidized part b which element is reduced in this reaction? 2hcl+2kmno4+3h2c2o4→6co2+2mno2+2kcl+4h2o enter the elemental symbol. view available hint(s) is reduced