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The geometric angle BETWEEN the two bonds that connect an alpha-carbon to its nearest neighbors on the polypeptide backbone is approximately 109 degrees. Explain. What is polypeptide backbone?
how many millicuries of radioactivity are associated with a sample containing 5.10 mg th mass number of 229 which has a
which of the following atoms with the specified electronic configuration would have the lowest first ionization energy? (a) (He)2s^2 2p^3 (b) (ne) 3s^2 3p^4 (c) [Xe]6s^1 (d) [Xe]6s^2 4f^14 5d^10 6p^1
the ratio of the number of nuclei in the first excited nuclear energy level to the number of of nuclei for a nucleus with ε1 - ε0 = 1MeV at 25C. At what temperature is kBT on the order of ε1 - ε0. Note 1MeV = 10^6eV
sample of this compound is combusted in excess oxygen and the products are 2.492 g of CO2 and 0.6495 g of H20. Determine the empirical formula of the active ingredient.
a new element setonium has been isolated and consistent with some predictions is nonradioactive. while only nanogram
Calculate the pH of a solution formed by mixing 250.0 mL of 0.15 M NH4Cl with 100.0 mL of 0.20 M NH3.
What is the molality of chromium(III) chloride in a solution prepared by dissolving 75.2 g chromium(III) chloride hexahydrate (CrCl3· 6H2O) in 250.0 g of water.
a 50 ml vol. of 25 ppm solution of niiiis made fromnicl26h20.a.what is the concentration of niii in micromolar units.b.
This buffer is to be prepared by mixing 25.0 mL of 0.1 M HCl with the correct mass of solid sodium acetate. You will determine the mass of solid sodium acetate needed.
A 0.0490 molal aqueous NaBr solution freezes at -0.173°C. What is its apparent percent dissociation in this solution? Kf = 1.86°C/m for water. NaBr -> Na+ + Br-
Two liters of a buffered solution are created from 0.45 M HC2H3O2 (Ka = 1.8 x 10^-5) and 0.36 M NaC2H3O2. (a) What is the pH of this solution
how many moles of solid naf would have to be added to 1.0 l of 1.90 m hf solution to achieve a buffer of ph 3.35
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