Modify the structures (if necessary) to show the predominant form of the amino acid tyrosine at each pH. Be sure to include the proper number of hydrogen atoms on heteroatoms and the correct formal charges on atoms. At pH 4.6 At pH 11.1 Select Draw Rings More Erase Select Draw Rings More Erase C H N H N OH OH + H,N - CH H,N - CH CH, CH, HC CH HC CH | | HC CH HC CH

In a very abstract way, hexaphenylbenzene was synthesized by putting all the following reagents together (catalysts, extra acids and bases not shown). Based on this information and included stoichiometry, the overall synthesis is a net Ph- 3 Phi тон Ph Ph Fe of carbon? Ph Ph. Ph Ph シャープ HaNO-N Ph Ph Ph 2 HBr N₂ -Phi 5 H₂O HCI Keep in mind that phosphorous is less electronegative than carbon. O a. oxidation O b. not a redox Oc. reduction H₂

answer part C/last question only. box the answer and MAKE SURE IT IS CORRECT

When the pH is more than two (2) pH units BELOW the pKa of an amine group (e.g. -NH2), what form is the chemical group in? Select BOTH the number of hydrogens and its charge (check two boxes) no hydrogens (0 H) one hydrogen (1 H) Otwo hydrogens (2 H) three hydrogens (3 H) positive charge (+) neutral charge (0) negative charge (-)

Consider structures A-D. Part 1 of 3 U A B Select the two species that represent conjugate acid-base pairs. Check all that apply. U A D : 0: x O B X C H Ꭰ

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3. study the Lewis structure of a geheric amino acial shann below ldentify the part af generic amino acid that reacts ith bose and the part thadthaanctawith acial. Brief explain your ansher R C-COOH NH

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Hint Check Answer Question 7 of 40 Consider the structure of lysine. The pKa values for lysine's protonatable groups are 2.18, 8.95, and 10.53. Complete the statements about lysine's pK, values and estimate the amino acid's isoelectric point (pl) . HO- CH2 CH2 CH2 CH2 +NH3 The pKa value of 2.18 corresponds with lysine's The pKa value of 8.95 corresponds with lysine's The pK value of 10.53 corresponds with lysine's MacBook PrO