Chemistry Textbooks (139)

Major product formed in following reaction is : \(\mathrm{OH} \frac{\mathrm{NaCl}}{\mathrm{H}_{2} \mathrm{SO}_{4}, \Delta}\)

Many pharmaceuticals are marketed with the designation "HCl" appended to the name of the drug. What does the "HCl" mean? What type of reaction would be involved in converting a drug to the HCl form? What are the advantages of this form of the drug?

Distribution coefficient of an organic acid between water and benzene is \(4.1\) is favour of \(\mathrm{C}_{6} \mathrm{H}_{6}\). If \(5 \mathrm{~g}\) of the acid is distributed in between 50 \(\mathrm{mL}\) of benzene and \(100 \mathrm{~mL}\) of water, calculate the concentration of the acid in two solvents.

Write an equation for the reaction of chloroacetic acid \(\left(K_{\mathrm{a}}=1.5 \times 10^{-3}\right)\) with trimethylamine \(\left(K_{\mathrm{b}}=5.9 \times 10^{-5}\right)\) Calculate the equilibrium constant for the reaction. If \(0.10 \mathrm{M}\) solutions of these two species are mixed, what will be their concentrations at equilibrium?

For each of the following, fill in the blank with the correct response(s). All of the following pertain to nucleic acids. a. The substance in the nucleus of the cell that stores and transmits genetic information is DNA, which stands for _______. b. The basic repeating monomer units of DNA and RNA are called ________. c. The pentose deoxyribose is found in DNA, whereas _______ is found in RNA. d. The basic linkage in DNA or RNA between the sugar molecule and phosphoric acid is a phosphate ______ linkage. e. The bases on opposite strands of DNA are said to be _______ to each other, which means the bases fit together specifically by hydrogen bonding to one another. f. In a strand of normal DNA, the base _______ is always found paired with the base adenine, whereas ______ is always found paired with cytosine. g. A given segment of the DNA molecule, which contains the molecular coding for a specific protein to be synthesized, is referred to as a __________. h. During protein synthesis,_________ RNA molecules attach to and transport specific amino acids to the appropriate position on the pattern provided by_________ RNA molecules. i. The codes specified by _______ are responsible for assembling the correct primary structure of proteins.