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- A trypsin enzyme assay was performed by mixing 50 µL of trypsin with 950 µL of substrate in a cuvette with a pathlength of 1.00 cm. The absorption coefficient for the product formed by this reaction at 480 nm is 4130 M-'cm'. The rate of change in absorbance at 480 nm was 0.129 abs/min. What is the rate of this reaction in units of µmol/min?Which term best describes the process shown below? neutralization B propagation termination initiation eliminationwrite the mechanism for the following reactions Br Br₂ CH2Cl2 MCBPA Å -Br
- Calculate the rate constant for the first-order decay of ^43K (t1/2 = 2.33 h)P17A.1 The following initial-rate data were obtained on the rate of binding of glucose with the enzyme hexokinase present at 1.34 mmol dm. What is (a) the order of reaction with respect to glucose, (b) the rate constant? [C,H,„O,J/(mmoldm³) 1.00 1.54 3.12 4.02 12 v/(mol dms) 5.0 7.6 15.5 20.0The biuret reaction is a general method for the determination of proteins or peptides. This method is based on the reaction of the Cu2+ with four NH groups of the peptide bonds, forming a violet complex with an absorption maximum at 540 nm. The intensity of the color is proportional to the number of peptide bonds present, and therefore to the amount of protein. This reaction is specific, the dipeptides and amino acids give a negative reaction, and few substances interfere. A quantity of 19.89 g of fish meat is extracted with 100 mL of glacial acetic acid. Subsequently, 3 mL of the previous solution with 3 mL of the biuret reagent to generate the reaction, after 30 minutes. To reduce errors due to other interfering substances and residual turbidity, the corrected absorbance method Ac is applied to 500 nm and 570 nm. In a study, a standard sample analyzed by the Kjeldahl method (total Nitrogen analysis) is obtained, resulting in 0.43% N (w / v), (Protein content [%] =% N x 6.38). 3 mL of…
- A chemistry student at GGC synthesized a new sulfonamide (S7) drug to help treat malaria. Using a spectrophotometer, the student observed that S7 converts to a colorless molecule in the presence of malaria parasite called Plasmodium falciparum. To study the rate of reaction, the student recorded the absorbance/amount of S7 at a wavelength of 570 nm. The results are summarized in the table below: Absorbance/Amount of S7 Time (s) 0.80 0.63 10 0.50 15 0.40 20 0.32 25 0.25 30 0.20Explain the transitions occurring when acetaldehyde (CH3-CHO) is exposed to EM radiation.Note that our data is ABSORBANCE versus time, not CONCENTRATION versus time. Absorbance and concentration are proportional according to Beer's law A = abc or A = ElC so the data is still useful. However, extracting the rate constant from a linear plot may be annoying if the rate constant is supposed to incorporate units of concentration. For example, if the rate constant should be 0.25/s then there is no problem, but if the rate constant should be 0.25 M/s then how can we get the molar unit directly from a graph involving ABSORBANCE and time? We can't. We'd need to involve Beer's law. Hopefully we won't need to do that. Identify the symbols used in Beer's law. A molar absorbtivity / extinction coefficient a molar concentration b absorbance path length through the sample C
- with amine concentration as shown below. A time-resolved laser spectroscopy experiment had also shown that the half-life of the phosphorescence in the absence of quencher is 29 us. What is the value of k,? [Q/(mmol dm) 1.0 5.0 10.0 I/(arbitrary units) 0.41 0.25 0.16 P17G.4 When benzophenone is exposed to ultraviolet radiation it is excited into a singlet state. This singlet changes rapidly into a triplet, which phosphoresces. Triethylamine acts as a quencher for the triplet. In an experiment in the solvent methanol, the phosphorescence intensity variedUsing the the concentrations for OH and methane below calculate the lifetime of methane due to reaction with OH. If the exchange time for transport between hemispheres is about 1 yr, how would this reaction affect the global distribution of methane? [CH4] = 5 x 1013 molecules cm-3 [OH] = 1 x 106 molecules cm-3 T= 290 k3. In a pulse radiolysis experiment, H atoms are suddenly created in liquid ethanol (density 0.79 g cm) containing 8 mM ethene. The initial concentration of H atoms falls to half its value in 1.8 ns. Two different radical products are detected by ESR, CH;CH2 and CH;CHOH, in the ratio 1:3. H+ CH2=CH2 → CH3CH2 (1) H+ CH3CH2OH → H2 + CH3ĊHOH (2) Calculate the pseudo-first-order rate constant for H decay, and thence determine the second-order rate constants for reactions (1) and (2).
