Snapsolve any problem by taking a picture. Try it in the Numerade app?
An amino acid is dissolved in solution at a pH which is the same as its isoelectric point. Most of the amino acid molecules in solution will have an ionized carboxylic acid group. True or False? Most of the amino acid molecules in solution will have an ionized amine group. True or False? Most of the amino acid molecules in solution will exhibit a net charge of zero. True or False? Lowering the pH will lower the zwitterion concentration. True or False? Liquid X has a surface tension value of 35 mNm and liquid Y has a surface tension value of 50 mNm. The interfacial tension between the two liquids could be determined using the capillary rise method. True or False? The cohesive forces in liquid Y are stronger than the cohesive forces in liquid X. True or False? X will spread on Y more readily than it will spread on X. True or False? The work of adhesion is the work required to separate liquid X from liquid Y at their interface. True or False?
Added by Irene C.
Close
Step 1
At this pH, the carboxylic acid group will be deprotonated and the amine group will be protonated, so most of the amino acid molecules in solution will have an ionized carboxylic acid group and a protonated amine group. Therefore, the statement "Most of the amino Show more…
Show all steps
Kaden Bunch and 96 other Chemistry 101 educators are ready to help you.
Ask a new question
Recommended Videos
Indicate if a statement is true or false by circling the appropriate response: (True) or (False): An α-amino acid exists in its Zwitterionic form at a solution pH equal to its pI. (True) or (False): An α-amino acid with a pI = 7.0 will migrate to the negatively charged plate during an electrophoresis analysis using a pH = 9 buffer. (True) or (False): The number of amino acids present in polyamide determines its classification as a polypeptide or as a protein. (True) or (False): The secondary structure of a protein (α-helix or β-sheet) depends upon its primary structure (amino acid sequence) and the resulting intramolecular hydrogen bonding that occurs. (True) or (False): The tertiary structure of most enzymes is classified as "Fibrous".
John N.
1. The hydrogen on an amine group can hydrogen bond to an oxygen on a carbonyl group to stabilize an alpha helix. True or False 2. A carbonyl bond is nonpolar. True False 3. During translation, the growing peptide found in the P site is transferred onto the amino acid in the A site. True False Peptide bonds are formed between the (which one? oxygen, carbonyl, carboxyl, or side) group of one amino acid and the amine group of another. 4. If amino acids are found next to each other in a protein when folded, its because they are next to each other in the primary structure of the protein too. True False 5. The carboxy- terminus of proteins exit the ribosome first. True False
Sri K.
Answer true or false. (a) Aqueous solutions of amines are basic. (b) Aromatic amines such as aniline in general are weaker bases than aliphatic amines such as cyclohexanamine. (c) Aliphatic amines are stronger bases than inorganic bases such as $\mathrm{NaOH}$ and $\mathrm{KOH}$. (d) Water-insoluble amines react with strong aqueous acids such as HCl to form watersoluble salts. (e) If the pH of an aqueous solution of a $1^{\circ}$ aliphatic amine, $\mathrm{RNH}_{2}$, is adjusted to pH 2.0 by the addition of concentrated $\mathrm{HCl}$, the amine will be present in solution almost entirely as its conjugate acid, $\mathrm{RNH}_{3}^{+}$ (f) If the pH of an aqueous solution of a $1^{\circ}$ aliphatic amine, $\mathrm{RNH}_{2}$, is adjusted to pH 10.0 by the addition of $\mathrm{NaOH}$, the amine will be present in solution almost entirely as the free base, $\mathrm{RNH}_{2}$ (g) For a $1^{\circ}$ aliphatic amine, the concentrations of $\mathrm{RNH}_{3}^{+}$ and $\mathrm{RNH}_{2}$ will be equal when the pH of the solution is equal to the $\mathrm{p} K_{\mathrm{b}}$ of the amine.
Recommended Textbooks
Chemistry: Structure and Properties
Chemistry
Chemistry The Central Science
Watch the video solution with this free unlock.
Not finding what your looking for? Here are some other ways we can help!
Generate practice questions
Explain a concept
Create a study plan
EMAIL
PASSWORD