Draw a Fischer projection for each of the following amino

Organic Chemistry 9
Do the following electrocyclic reactions take place in a conrotatory or disrotatory manner? Under what conditions, thermal or photochemical, would you carry out each reaction? (a) H H (b) H H

Organic Chemistry 3
The 1 H NMR spectrum of 1,2-dimethoxyethane (CH3OCH2CH2OCH3) recorded on a 300 MHz NMR spectrometer consists of signals at 1017 Hz and 1065 Hz downfi eld from TMS. (a) Calculate the chemical shift of each absorption. (b) At what frequency would each absorption occur if the spectrum were recorded on a

Physical Chemistry 8
A vessel of volume \(22.4\mathrm{\ dm}^3\) contains \(1.5\mathrm{\ mol}\mathrm{\ H}_2\) and \(2.5\mathrm{\ mol}\mathrm{\ N}_2\) at \(273.15\mathrm{\ K}\). Calculate (a) the mole fractions of each component, (b) their partial pressures, and (c) their total pressure.

Campbell Biology 10
One feature that amphibians and humans have in common is a. the number of heart chambers. b. a complete separation of circuits for circulation. c. the number of circuits for circulation. d. a low blood pressure in the systemic circuit.

Quantitative Chemical Analysis 8
In a coulometric Karl Fischer water analysis, 25.00 mL of pure dry methanol required 4.23 C to generate enough I2 to react with the residual H2O in the methanol. A suspension of 0.847 6 g of finely ground polymeric material in 25.00 mL of the same dry methanol required 63.16 C. Find the weight percen

Essentials of Statistics for the Behavioral Sciences 10
Open positions in the highest-paying jobs, the best internships, and the most prestigious graduate programs can attract many applicants. Initial evaluations of applications are usually based on the applicants rsum or curriculum vitae. In a recent study, researchers demonstrated that two different kin

Biology: Concepts and Applications 10
In plants, photosynthetic eukaryotes, and cyanobacteria, the light-dependent reactions proceed in/at the _____ . a. thylakoid membrane b. plasma membrane c. stroma d. cytoplasm

Social Psychology 8
In experiments on obedience, most participants who were ordered to administer severe shocks to an innocent person refused to do so.