38. Using the Woodward-Fieser rules, calculate the value of UV-vis absorption maximum wavelength in the UV-vis spectrum for each compounds (heteroannular diene: 214 nm; homoannular diene: 253 nm)
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38. Using the Woodward-Fieser rules, calculate the value of
UV-vis absorption maximum wavelength in the UV-vis...
Using the Woodward-Fieser Rules to predict the wavelength of maximum absorption wavelength for pseudoionone, a-ionone and...
Using the Woodward-Fieser Rules to predict the wavelength of
maximum absorption wavelength for pseudoionone, a-ionone and
b-ionone. Show your calculations.
pseudoionone alpha-ionone beta-ionone
443 471 502 Absorbance 360 Wavelength (nm) In the UV-Vis spectrum above, consider the molar absorption...
443 471 502 Absorbance 360 Wavelength (nm) In the UV-Vis spectrum above, consider the molar absorption coefficient at 443 nm and 502 nm. The coefficient for 443 nm is: Select one: a. Higher than at 502 nm b. Lower than at 502 nm c. The same at 502 nm
1. (a) Why does buta-1,3-diene (max 217 nm) have a longer-wavelength (lower-energy) UV-Vis absorption peak as...
1. (a) Why does buta-1,3-diene (max 217 nm) have a longer-wavelength (lower-energy) UV-Vis absorption peak as compared to ethene (max 171 nm)? Include an energy level diagram with your answer. (b) What would you expect to happen as you add on to this structure with additional double bonds? Hint: consider the total number of p atomic orbitals contributing to each molecule, as depicted below. ?-? Ethene Butadiene
Can you do Q6? EXERCISES 153 Woodward's rules, predict the absorption maximum for the 2-5 Using...
Can you do Q6?
EXERCISES 153 Woodward's rules, predict the absorption maximum for the 2-5 Using following compound: Ans: 349 nm 2-6 A 10- M solution of Cu(lI) in concentrated HCl is a pale green-blue. whereas Cu(II) in concentrated ammonia is an intense blue-violet color. (a) What is the mechanism of absorption which is responsible for cupric-ion solu- tions being colored? (b) Explain why ammonia gives Cu(II) solutions an intense blue-violet color whereas HCI imparts a pale green-blue color. (e)...
Table 1. Concentrations of [Fe(Phen),1?, M, in water and UV- vis absorbance values recorded at 2...
Table 1. Concentrations of [Fe(Phen),1?, M, in water and UV- vis absorbance values recorded at 2 -505 nm. Concentration of [Fe(Phen)/, M Absorbance 9.500 x 10 0.999 4.250 x 10 0.480 0.219 2.125 10% 1.063 x 10 0.104 0.000 0.003 Table 2. UV-vis absorbance values of [Fe(phen)]* held at 35 °C after mixing with H SO, and recorded at 5 minute intervals (in water at max = 505 nm). Time (minutes) Absorbance 0.997 0.935 0.877 0.823 0.772 0.724 0.680 0.638...
Pre-Lab Assignment 1) Draw the reaction mechanism for the reaction. 2) Determine the limiting reagent. Procedure...
Pre-Lab Assignment
1) Draw the reaction mechanism for the reaction.
2) Determine the limiting reagent.
Procedure 1 Place approximately 1 g of stilbene dibromide prepared in last week's experiment in a 50 mL round bottom flask. Record the exact mass. Add 0.8 g of KOH and 4 mL of triethylene glycol from the syringe provided in the fume hood (rinse any crystals from the sides of the flask while adding triethylene glycol). 2 Heat the stirred reaction mixture to a...
Based on the document below, 1. Describe the hypothesis Chaudhuri et al ids attempting to evaluate;...
Based on the document below,
1. Describe the hypothesis Chaudhuri et al ids attempting to
evaluate; in other words, what is the goal of this paper? Why is he
writing it?
2. Does the data presented in the paper support the hypothesis
stated in the introduction? Explain.
3.According to Chaudhuri, what is the potential role of thew
alkaline phosphatase in the cleanup of industrial waste.
CHAUDHURI et al: KINETIC BEHAVIOUR OF CALF INTESTINAL ALP WITH PNPP 8.5, 9, 9.5, 10,...
Using the Woodward-Fieser Rules to predict the wavelength of
maximum absorption wavelength for pseudoionone, a-ionone and
b-ionone. Show your calculations.
pseudoionone alpha-ionone beta-ionone
443 471 502 Absorbance 360 Wavelength (nm) In the UV-Vis spectrum above, consider the molar absorption coefficient at 443 nm and 502 nm. The coefficient for 443 nm is: Select one: a. Higher than at 502 nm b. Lower than at 502 nm c. The same at 502 nm
1. (a) Why does buta-1,3-diene (max 217 nm) have a longer-wavelength (lower-energy) UV-Vis absorption peak as compared to ethene (max 171 nm)? Include an energy level diagram with your answer. (b) What would you expect to happen as you add on to this structure with additional double bonds? Hint: consider the total number of p atomic orbitals contributing to each molecule, as depicted below. ?-? Ethene Butadiene
Can you do Q6?
EXERCISES 153 Woodward's rules, predict the absorption maximum for the 2-5 Using following compound: Ans: 349 nm 2-6 A 10- M solution of Cu(lI) in concentrated HCl is a pale green-blue. whereas Cu(II) in concentrated ammonia is an intense blue-violet color. (a) What is the mechanism of absorption which is responsible for cupric-ion solu- tions being colored? (b) Explain why ammonia gives Cu(II) solutions an intense blue-violet color whereas HCI imparts a pale green-blue color. (e)...
Table 1. Concentrations of [Fe(Phen),1?, M, in water and UV- vis absorbance values recorded at 2 -505 nm. Concentration of [Fe(Phen)/, M Absorbance 9.500 x 10 0.999 4.250 x 10 0.480 0.219 2.125 10% 1.063 x 10 0.104 0.000 0.003 Table 2. UV-vis absorbance values of [Fe(phen)]* held at 35 °C after mixing with H SO, and recorded at 5 minute intervals (in water at max = 505 nm). Time (minutes) Absorbance 0.997 0.935 0.877 0.823 0.772 0.724 0.680 0.638...
Pre-Lab Assignment
1) Draw the reaction mechanism for the reaction.
2) Determine the limiting reagent.
Procedure 1 Place approximately 1 g of stilbene dibromide prepared in last week's experiment in a 50 mL round bottom flask. Record the exact mass. Add 0.8 g of KOH and 4 mL of triethylene glycol from the syringe provided in the fume hood (rinse any crystals from the sides of the flask while adding triethylene glycol). 2 Heat the stirred reaction mixture to a...
Based on the document below,
1. Describe the hypothesis Chaudhuri et al ids attempting to
evaluate; in other words, what is the goal of this paper? Why is he
writing it?
2. Does the data presented in the paper support the hypothesis
stated in the introduction? Explain.
3.According to Chaudhuri, what is the potential role of thew
alkaline phosphatase in the cleanup of industrial waste.
CHAUDHURI et al: KINETIC BEHAVIOUR OF CALF INTESTINAL ALP WITH PNPP 8.5, 9, 9.5, 10,...
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