Need help with Beer’s Law You make a solution with one drop of blue dye in water. You record an absorbance value of 0.692 with a spectrometer, measured in a 1-cm cuvette at a wavelength of 630nm. The molar absorptivity of the dye is 1.38×10^5 L/(mole x cm). Use Beer’s Law to calculate the concentration […]
pH Calculate the pH of a solution prepared by mixing 20mL of .20M NH3 with 40mL of .10M HNO3 (Kb for NH3= 1.8 x 10^-5)
Chem help pleaseeeee I need this done by tonight!!! Determine the molal boiling point elevation constant for a solvent if the boiling point of a solution made by dissolving 0.75 g of urea, NH2CONH2, in 14.0 g of the solvent results in an increase in the boiling point of 2.44째C greater than that of the […]
rate of dissaperance The reaction that occurs in a brethalyzer, a device used to determine the alcohol level in a person’s bloodstream is given below. If the rate of apperance of Cr2(SO4)3 is 1.24 M/min at a particular moment, what is the rate of dissapperance of C2H6O at that moment? 2K2Cr2O7 + 8H2SO4 + 3C2H6O […]
eigenfuctions Are the eigenfunctions of H for the particle in the one dimensional box also eigenfunctions of the position operator x? Calculate the average value of x for the case where n=3 and for n=5.
–help 1 The following initial rate data are for the reaction of ammonium ion with nitrite ion in aqueous solution: NH4+ + NO2- N2 + 2 H2O Experiment [NH4+]o, M [NO2-]o, M Initial Rate, Ms-1 1 0.124 0.170 7.06E-6 2 0.124 0.340 1.41E-5 3 0.247 0.170 1.41E-5 4 0.247 0.340 2.81E-5 1.Complete the rate law […]
Extra Credit Assignment. This document contains descriptions of four research projects (A, B, C and D). These are all actual research projects that were funded by the National Science Foundation (NSF). They were funded when I wrote up this concept for an extra credit assignment, about a year ago, but I haven’t checked to see […]
1,000 Word Essay Summarizing Interviews with SPED Team Introduction to PHI Details: Create your special education (SPED) team for this course. Include at least one special and one regular educator. Hospital staff and specialists in the medical field will be valuable sources of information. For assignments in this course, you will also need to interact […]
quantum numbers Assuming electrons with quantum numbers (n,l,mt,ms) which is the lowest in energy A) (3,1,1,+1/2) B) (2,1,-1,+1/2) C) (2,0,0,-1/2)
pandora and the freemium model Q1: Compare Pandora’s original business model with its current business model. What’s the difference between “free” and “freemium” revenue models? Q2: What is the customer value proposition that Pandora offers? Q3: Why did MailChimp ultimately succeed with a freemium model but Ning did not? Q4: What’s the most important consideration […]