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1. Explain why an object whose color is purple actually absorbs visible light in the green wavelength region.
2. If the concentration of an unknown solution we were studying in a Beer's Law experiment were higher than the range of concentrations used to prepare the standard plot, suggest how we could determine its concentration. Suggest possible limitations.
3. A solution containing 0.010 moles of some copmlex ion in 100.0mL of solution was observed to transmit 65/0% of the incident light compared to an appropriate blank. a) what is the absorption of the solution at this wavelength? b) what fraction of light would be transmitted by a solution four times as concentrated?
4. A sample in a 1.0 cm cell is determined to transmit 80.0% of the light at a fixed wavelength. If the molar absorptivity of this substance at this wavelength is 2.3, what is the concentration of the substance?
5. a) what are the factors that could lead to deviations from Beer's law? b) Name at least three factors that could lead to experimental errors in the measurements made in this experiment.
When measuring horse radish peroxidase you found that a purified preparation has a specific activity of 10mmolar/sec/mg protein. suppose you added to an assay a competitive inhibitor that would not produce a colored product.
Draw resonanc contributors for the following species. Indicate which are major contributors and which are minor contributors to the resonance hybrid:
Calculate the pH of a 0.42 M solution of sodium acetate, CH3COONa. (Ka(acetic acid) = 1.8 x 10-5 )
What is the wavelength (in nm) of the line in the spectrum of the hydrogen atom that arises from the transition of the electron from the orbital with n =3 to the orbital
The slope of an arrhenius plot between ln k and 1/t for a reaction is -0.66x10^4 K, and the y intercept is 11.25. what is the activation energy and the frequency factor of the reaction respectively?
A helium-filled weather balloon has a volume of 714 L at 23 oC and 759 mmHg. It is released and rises to an altitude of 4.80 km, where the pressure is 495 mm Hg and the temperature is -9oC. what is the volume of the balloon at this altitude.
How many Grams of NH3 are consumed when 12.5 grams of 02 react completely in the following equation? I am not sure exactly how to solve this.
What is the concentration of hydrogen ions in a solution containing 0.39 M HOCN(cyanic acid) and 0.726 M (NaOCN) (sodium shiu (ys6479) - Acid Base Buffers - dungan - (00533434) 3 cyanate).
How many grams of acetylene are produced by adding water to 5.0 grams CaC2
"Given the following standard reduction potentials, E°redAl3+/Al = -1.66 V. E°redCr3+/Cr = -0.74 V.
A student weighed out 0.1225 g of the unknown copper bromide salt and carried out a titration like the one you performed in week 4. If the sample required 17.00 mL of 0.03525 M thiosulfate solution to reach the endpoint, what is the percent by ma..
How many gms of H2O must be combined to 519.5 gms of methanol at 20°C to have an osmotic pressure of 408 mm of Hg? Methanol density = 0.8921 g/mL.
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