Chemistry, 31.08.2019 08:30 corban13

The amino acid glycine (h3n+ch2co2h) has two acidic hs, one with pka = 2.34 and the other with pka=9.60. draw the structure of the form of glycine that predominates at a ph of 12.

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Glycine is the simplest amino acid there is. Its structural formula is shown in the attached picture. Amino acids are characterized with having an amine group and a carboxylic group at both ends of the terminals. Carboxylic acid is acidic so it has a partial negative charge on one side. Amines are basic so it has a partially positive charge on the other side. Possessing this property of having opposite charges at once is called a zwitterion. That is what is meant by the pKa values. These are the pH values of the individual functional groups. The pKa 2.34 is for the carboxylic group while pKa 9.6 is for the amine group.

These electrostatic attractions depend on the pH of the solution. At pH 12, the functional group that predominates is the carboxylic group with an overall charge of -1 as shown in the second picture.

The amino acid glycine (h3n+ch2co2h) has two acidic hs, one with pka = 2.34 and the other with pka=9

The amino acid glycine (h3n+ch2co2h) has two acidic hs, one with pka = 2.34 and the other with pka=9

Answer from: Quest

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6

Answer from: Quest

a rain shadow is a dry region of land on the side that is protected against the prevailing winds of a mountain range. the prevailing winds are the winds that occur most of the time in a particular place of the earth

prevailing winds carry air toward the mountain range. as the air rises up over a mountain range, the air cools, water vapor condenses, and clouds form. on this side of the mountains, called the windward side, precipitation falls in the form of rain or snow. this dry air produces a rain shadow.