Food Dyes Analysis of Commercial Products Part 2 (1)

Carbon monoxide is another common poison found in the forensic laboratory. Explain how UV-visible spectrophotometry is applied to quantify carbon monoxide in blood samples.

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For a molecule, the phosphorescence lifetime without quenching is 1.0 s while with a quencher population of 10-2 M the phosphorescence lifetime is 0.10 s. Calculate the rate constant for phosphorescence assuming that kisc >> (kF + kec + kic). Calculate the rate constant for external conversion of the triplet state (kec’), the quenching rate constant for the triplet state (kq’), and the Stern-Volmer quenching constant. Assume that intersystem crossing from T1 to So is negligible.

to Johnston Commun X Rh Blackboard Collaborate Ultra - x > General Psychology-Fall 2021 A ALEKS - Griffin Barden - Learn + A www-awa.aleks.com/alekscgi/x/Isl.exe/1o_u-IgNslkr7j8P3jH-IJczzdcvSCzsqTCIDqNGV3bKqhMfPmUcQ4ENkmiXn9QCwgeDPDkQ06yszYWESPcekwLO-Qg619rekU7404HgFAGbEZa Dr080?1 oBw7QYjlbavbSPXtx-YCjsh_7mMmrq#item O THERMOCHEMISTRY Griffin Calculating a molar heat of reaction from formation enthalpies Using the table of standard formation enthalpies that you'll find under the ALEKS Data tab, calculate the reaction enthalpy of this reaction under standard conditions: 2C,H;(g)+70,(9)→4 CO,(g)+6H,O() Round your answer to the nearest kJ.

In a photochemical experiment it is observed that 5.78×10-5 mol of uranyl oxalate is decomposed at a wavelength of 300 nm emitted by a lamp in one hour. When acetone was irradiated with the same lamp for 10 hours, the amount of acetone decomposed was found to be 2.32× 10-4 mol. What is quantumyield for the acetone decomposition under the same condition?

Consider the quenching of an organic fluorescent species with τ0 = 6.0 ns by a d-metal ion with kQ = 3.0 × 108 dm3 mol−1 s−1. Predict the concentration of quencher required to decrease the fluorescence intensity of the organic species to 50 per cent of the unquenched value.

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Laser. Indicate the relationship between metastable state and stimulated emission.

(c) Comment on the truth, or otherwise, of the following statement. "Fast time-scale flash photolysis can be used to determine rate constants for collisional relaxation (quenching) processes of singlet and triplet states. Radiative decay rate constants (Einstein A coefficients) can be determined from such measurements, and can also be calculated from absorption coefficients."

Chlorophyll absorbs photons strongly in two bands, one between 340 and 450 nm and the other between 650 and 680 nm. Chlorophyll collects and transfers the photon energy to fix CO2 into carbohydrate CH2O units according to CO2 + H2O → (CH2O) + O2 where the (CH2O) indicates one carbon unit of the carbohydrate. The average enthalpy change for the addition of a carbon unit to a carbohydrate is ΔH = 485 kJ/mol. What is the minimum number of 660 nm photons needed by chlorophyll to add a carbon unit to a carbohydrate? (Remember that there’s no such thing as a partial photon.) Please no copy paste

Chlorophyll absorbs photons strongly in two bands, one between 340 and 450 nm and the other between 650 and 680 nm. Chlorophyll collects and transfers the photon energy to fix CO2 into carbohydrate CH2O units according to CO2 + H2O → (CH2O) + O2 where the (CH2O) indicates one carbon unit of the carbohydrate. The average enthalpy change for the addition of a carbon unit to a carbohydrate is ΔH = 485 kJ/mol. What is the minimum number of 660 nm photons needed by chlorophyll to add a carbon unit to a carbohydrate? (Remember that there’s no such thing as a partial photon.) Please no copy paste from anywhere

gs- UNF x ALEKS Chemistry McGraw-Hill Education Campus A ALEKS - Lindsay Brooks - Learn www-awn.aleks.com/alekscgi/x/Isl.exe/1o_u-lgNslkr7j8P3jH-IBcWcplLoFLoU71DOb3zrKPTUHJHevE88rwcvGV34AJO-k5zrX83aDiBgWlpQ4wr9EXOY65AO49daviN50MUe5NRg-sH_9k 1 Gmail YouTube Maps O ELECTRONIC STRUCTURE 三I Deducing n and I from a subshell label Complete the table below by filling in the principal quantum number n and angular momentum quantum number / for each electron subshell listed. subshell principal angular momentum quantum number n quantum number / 6p 6f 2s 5f Explanation Check © 2021 McGraw-Hill Education. All Rights Reserved. Terms of Use %23 APR o here to search II 1II

Discuss how X-rays suitable for macromolecular studies are generated “in-house”. What are the advantages of using synchrotron radiation for macromolecular studies?

An amino acid on the surface of a protein was labelled covalently with 1.5-I AEDANS and another was labelled covalently with FITC. The fluorescence quantum yield of 1.5-I AEDANS decreased by 10 per cent due to quenching by FITC. What is the distance between the amino acids? (Refer to Table 17G.3 for the appropriate value of R0.)

You are trying to come up with a drug to inhibit the activity of an enzyme  thought to have a role in liver disease. In the laboratory the enzyme was shown to have a Km of 1.0 x 10-6 M and Vmax of 0.1 micromoles/min.mg measured at room temperature. You developed an uncompetitive inhibitor. In the presence of 5.0 x 10-5 M inhibitor, the apparent Vmax  was determined to be 0.02 micromoles/min.mg. What is the Ki of the inhibitor?

The use of pesticides have allowed agricultural production to increase without an increase in farmed land. Leaching of pesticides from fields into lakes, streams, and the local water table can have detrimental environmental and health consequences. To limit leaching environmental protection regulations require that the half-life of pesticides to be less the 250 days. Report all answers to 3 significant digits A. You are hired to monitor the compliance of pesticides with environmental regulations. You obtain a a pesticide sample with a concentration of 0.2M/L from a local farmer 25 days later you measure the concentration to be 0.19M/L, is the pesticide in compliance with the regulation? Use the formula below: Use the 25 days as the t value and solve for r then subsitute all known values in to find t1/2. Once you find r, find the half-life and compare your t value to 250 days. N(t) = N(0) . ert B) A catalyst can be added to double the decay rate of the pesticide. What is the…