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Chemistry textbook answers & solutions

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Most popular questions for Chemistry Textbooks

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 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 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.

A sample of an oxide of vanadium weighing \(4.589 \mathrm{~g}\) was heated with hydrogen gas to form water and another oxide of vanadium weighing $3.782 \mathrm{~g} .$ The second oxide was treated further with hydrogen until only \(2.573 \mathrm{~g}\) of vanadium metal remained. (a) What are the simplest formulas of the two oxides? (b) What is the total mass of water formed in the successive reactions?

In a classic experiment in physical organic chemistry, \((R)-2\) -iodooctane was allowed to react (non-enzymatically) with a radioactive isotope of iodide ion, and the researchers monitored how fast the radioactive iodide was incorporated into the alkane (the rate constant of incorporation, \(\mathrm{k}_{i}\) ) and also how fast optical activity was lost (the rate constant of racemization, \(\mathrm{k}_{r}\) ). They found that the rate of racemization was, within experimental error, equal to twice the rate of incorporation. Discuss the significance of this result - what does it say about the actual mechanism of the reaction?

Borazine, \((\mathrm{BH})_{3}(\mathrm{NH})_{3},\) is an analog of \(\mathrm{C}_{6} \mathrm{H}_{6},\) benzene. It can be prepared from the reaction of diborane with ammonia, with hydrogen as another product; or from lithium borohydride and ammonium chloride, with lithium chloride and hydrogen as the other products. (a) Write balanced chemical equations for the production of borazine using both synthetic methods. (b) Draw the Lewis dot structure of borazine. (c) How many grams of borazine can be prepared from $2.00 \mathrm{~L}$ of ammonia at STP, assuming diborane is in excess?

Our task is to measure the volume of blood in a live hippopotamus. One way to do this would be to drain its blood into a suitable container and measure its volume. Aside from the obviously disastrous effect this method would have on the hippo, it would not be very accurate since some blood would still remain behind in the tissues. Instead, we will inject the hippo with $2.00 \mathrm{~mL}\( of a \)2.00 \mathrm{M}$ dye solution which the hippo will not appreciably metabolize or excrete in one hour, and then measure the dye concentration in the bloodstream after 30 minutes (which should be sufficient time for the dye to thoroughly mix in the bloodstream). After 30 minutes, the concentration of the dye in a \(78.0 \mathrm{~mL}\) blood sample was found to be \(0.0000125 \mathrm{M}\). What is the volume of blood in the hippo?
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