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  • IR chemistry problem please help!?

    Cyclohexanone exhibits its strongest IR peak at 5.86 µm, and at this wavelength a linear relationship exists between absorbance and concentration

    a. Identify the part of the molecule responsible for the

    absorbance at this wavelength.


    b. Suggest a solvent that would be suitable for a quantitative

    analysis of cyclohexanone at this λ.

    c. A solution of cyclohexanone (2.0 mg/ml) in the solvent

    selected in part (b) exhibits an absorbance of 0.40, in a cell

    with a path length of 0.025 mm. What is the detection limit

    for this comp under these conditions if the noise associated

    with the spectrum of the solvent is 0.001 absorbance units?

    1 AnswerChemistry8 years ago
  • How to calculate transmittance from concentration?

    Im not sure how to do these

    3. A 10 mM solution has a transmittance of 45%. Calculate the transmittance of a 20mM solution at the same wavelength and optical pathlength.

    4. Two colored solution, C and D contain different dyes. Let the transmittances of these two solutions be TC and TD respectively, when measured in a 1-cm cell at a given wavelength. Express the transmittance TCD of the mixture of equal volumes of C and D, measured under the same conditions, in terms of TC and TD.

    1 AnswerChemistry8 years ago
  • I need help answering a question about D-amino acids?

    D-proteins are comprised of D-amino acids, rather than the typical L-amino acids. Such “mirror image” proteins are attractive therapeutics because they are not recognized by proteases, and thus have a longer half-life in the body. Provide a brief explanation for why the peptide bonds in D-proteins resist cleavage by proteases.

    1 AnswerChemistry8 years ago
  • Which statement about the nature of the hydrogen bond is always true?

    a. The donor is a hydrogen atom bonded ti a carbon

    b. The more linear the bond, the stronger the interaction

    c. The acceptor must be similar in electronegativity to hydrogen

    d. It is a type of covalent bond

    e. A hydrogen bond is weaker than van der waals forces

    1 AnswerChemistry8 years ago