I have been teaching chemistry at the collegiate level for over 23 years.
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What products would you expect to obtain when each of the following compounds is heated?(a) 4 -Hydroxybutanoicacid(b) 3 -Hydroxybutanoic acid(c) 2-Hydroxybutanoic acid(d) Glutaric acidFIGURES CANT COPY
Using VSEPR theory, predict the geometry of each nitrogen atom and each oxygen atom in the following compounds.CAN'T COPY THE FIGURE
Calculate the reduced masses of (a) an HD molecule, (b) a $^{12} \mathrm{C}-\mathrm{H}$ unit and (c) a $^{13} \mathrm{C}^{16} \mathrm{O}$ molecule. Exact masses: $^{1} \mathbf{H}, 1.01 ;^{2} \mathrm{H}, 2.01 ;^{12} \mathrm{C}$$12.00 ;^{13} \mathrm{C}, 13.00 ;^{16} \mathrm{O}, 15.99$.
For each of the following compounds, state the nature of the functional group present and approximately where in the IR spectrum you would expect to observe a characteristic absorption: (a) acetonitrile; (b) butanol; (c) ethylamine; (d) acetone. Use Tables 1.8 and 1.9 to help you.
(a) Why would you not expect to observe an IR spectroscopic absorption for the $\mathrm{C} \equiv \mathrm{C}$ stretch of $\mathrm{C}_{2} \mathrm{H}_{2} ?$ (b) Would you expect to observe such an absorption in the IR spectrum of $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{C} \equiv \mathrm{CH} ?$
Draw the structure(s) of the major organic product(s) of the following reaction after aqueous workup.You do not have to consider stereochemistry. Include counter-ions, e.g., Na+, I-, in your submission, but draw them in their own separate sketcher. If no reaction occurs, draw the organic starting material. Draw one structure per sketcher. Add additional sketchers using the drop-down menu in the bottom right corner. Separate multiple products using the + sign from the drop-down menu.
Chem 153A Problem Set 22. Relationship between the Titration Curve and the Acid-Base Properties of Glycine A 100 mL solution of 0.1 M glycine at pH 1.72 was titrated with 2 M NaOH solution. The pH was monitored and the results were plotted as shown in the following graph. The key points in the titration are designated I to V. For each of the statements (a) to (o), identify the appropriate key point in the titration and justify your choice.(a) Glycine is present predominantly as the species +H3N-CH2-COOH.(b) The average net charge of glycine is +1/2.(c) Half of the amino groups are ionized.(d) The pH is equal to the pKa of the carboxyl group.(e) The pH is equal to the pKa of the protonated amino group.(f) Glycine has its maximum buffering capacity.(g) The average net charge of glycine is zero.(h) The carboxyl group has been completely titrated (first equivalence point).(i) Glycine is completely titrated (second equivalence point).(j) The predominant species is +H3N-CH2-COO-.(k) The average net charge of glycine is -1.(l) Glycine is present predominantly as a 50:50 mixture of +H3N-CH2-COOH and +H3N-CH2-COO-.(m) This is the isoelectric point.(n) This is the end of the titration.(o) These are the worst pH regions for buffering power.
