Homework Help

There is 400 mL of 0.2 M histidine buffer- pH 11. Find the moles of HCl that are needed to change the pH to 3.2. -------- First, this is how you would go from acid to base (acid-->base): 1. There is 400 mL of 0.2 M histidine buffer- pH 3.2 Find the moles of OH that are needed to change the pH to 11. H+2 <--> H+1 <-->H0 <-->H-1 1) Find a and b using H-H, and pKa values (2.1-pKa of COOH and 3.2 in one equation, and 9.6-pKa of NH3+ and 11 in the second equation). ADD PLUS ONE. (H+1<---->H0) a+b+1=total1) [This total is the total # of equivalents.] 2) Multiply .4 L by 0.2 M.=total2) 3) Multiple total1) and total2) toge…

Using the fact that for all n≥M, (a^n)≤(a^M/M!)(a/M)^(n-M), Show that given some ε > 0, there exists a natural number M such that for all n ≥ M, (a^n)/n! < ε So Im looking for a potential value for M that would complete my proof. So far I have found that if M = ε(a^2+1) then it works, through experimenting with different values for a. However, this does not incorporate that (a^n)≤(a^M/M!)(a/M)^(n-M). I also cannot find a way of proving that choosing M = ε(a^2+1) works for this problem. Should I take a different approach?

I'm working on a hypersonic vehicle project and I have some questions regarding some results I have obtained. The scope of this project includes the calculation and plotting of the pressure, temperature, pressure coefficient, and drag coefficient on the surface of a blunt body. The three methods being used are the Newtonian Theory for a calorically perfect gas, Modified Newtonian Theory for a calorically perfect gas, and Modified Newtonian Theory for a thermo-chemical equilibrium gas. I have attached a zip file with these plots. I have also included a plot of the temperature distribution without the thermo-chemical equilibrium assumption. Looking at the temperatur…

I'm writing a report examining the link between Ozone thickness and UV dose. I have two data sets, one is Ozone thickness in Dobson units, the other is Cloud Free UV dose. I recorded these numbers over a period of time. I have a list of dates and the UV number and Ozone thickness in Dobson units for each date. I'm trying to do calculations which confirm the link between the two variables. I've tried to do T-Tests and I just can't seem to figure out if I'm using the right one. I'm not sure if I should use paired or unpaired. I'm fairly sure I should be using assumed equal variance, but I could be wrong. Anyway, my question is does a T-Test have any relevence with this data…

I have to build a scale 6 story model tower with 4-6in per story to survive on a shake table (to simulate a earthquake) out of raw spaghetti noodles and hot melt glue. 100 gram weights will be placed on the 2nd 4th 6th floors. I need to know how to calculate the forces that the model will endure and the strength of the model. i was thinking of incorporating the following design features. cross braces (forming triangles) have the tower tapper in from the base until it reaches the 4th floor where it will stop tapering and continue at the same width. I need to know if these will help. we are also supposed to build a base isolation system idk enough about the materials …

FIVEFOLD BONDING IN CR(I) DIMER “Synthesis of a Stable Compound with Fivefold Bonding Between Two Chromium(I) Centers” by Tailuan Nguyen, Andrew D. Sutton, Marcin Brynda, James C. Fettinger, Gary J. Long, and Philip P. Power, Science 310, 844-847 (2005). 1. Draw the Lewis structure for the Ar' ligand used in this paper. Keep in mind that the ligand is anionic with a 1- charge. 2. (a) Draw the MO energy diagram for an isolated [Cr2 ] 2+ molecule assuming the interactions of only the 3d orbitals. (b) Next to each energy level, draw pictures of the molecular orbitals. © Label each MO with the appropriate symmetry labels from the D∞h character table. (…

I have this sum: [LATEX] lim_{(x,y)->(0,0)} tan^{-1} (\frac{|x|+|y|}{x^2+y^2}) [/LATEX] and here's my attempt at a solution using the limit definition: I'll work with whats inside the arctan first, then dump the limit in there..I guess my limit as 0 (for fun--how to make intuitive guesses for proposed limits, I do not know). So [LATEX] lim_{(x,y)->(0,0)}\frac{|x|+|y|}{x^2+y^2} [/LATEX] [LATEX]|\frac{|x|+|y|}{x^2+y^2}|<\epsilon\ \ whenever\ \ \sqrt{x^2+y^2}<\delta [/LATEX] [LATEX]\frac{|x|+|y|}{x^2+y^2}< \frac{\sqrt{x^2}+\sqrt{y^2}}{x^2+y^2}[/LATEX] [LATEX]<\frac{\sqrt{x^2+y^2}+\sqrt{y^2+x^2}}{x^2+y^2}[/LATEX] [LATEX]=\frac{2 \sqrt{x^2+y^2}}{x^2+…

In computer science, a library is a collection of resources used to develop software.[/url] These may include pre-written code and subroutines, classes, values or type specifications.

http://www.statcrunch.com/5.0/survey.php?surveyid=2320&code=EUMZS Click the link. Not hard and won't take long. Need 30 responses for my class.Thanks

Hi my name is Andrew............... i have a problem i have to come up with a Science FAIR PROJET TOMMOROW ANY cool topics pls reply

so we have a project called LTD (learning through discovery) and i have a question called how does the tongue connect with the brain and the nose? so far i have this: Even though we don’t knowthis (or maybe we do), the nose plays a major role when tasting food. our senseof smell is actually responsible for 80% of what we taste. Without our sense ofsmell, we are only limited to five distinct sensations which aresweet,salty,sour,bitter and the newly discovered “umami” or savory sensation. Allof the other flavours come from smell. When you eat food, some of the foodmolecules travel to the back of your throat which are then picked up by the nerve endings in your nose wh…

I have the following electron configurations: Beryllium: Br=[He]2s2 Mercury: Hg=[Xe]6s24f145d10 Barium: Ba=[Xe]6s2 Cadmium: Cd=[Kr]5s24d10 Copper: Cu=[Ar]4s23d9 Lead: Pb=[Xe]6s24f145d106p2 Manganese: Mn=[Ar]4s23d5 Nickel: Ni=[Ar]4s23d8 Strontium: Sr=[Kr]5s2 Tin: Sn=[Kr]5s24d105p2 Vanadium: V=[Ar]4s23d3 Zinc: Zn=[Ar]4s23d10 Antimony: Sb=[Kr]5s24d105p3 Arsenic: As=[Ar]4s23d104p3 How do I predict, or construct a theory, as to why they are toxic based on these configurations?

i am doing M.sc in microbiology n i am not much interested in Phd in research,so please tell me doing MBA in healthcare management is beneficial or not or what can i do after M.sc in microbiology?

So I have my differential equations for 2 bodies coupled with 3 springs. [LATEX]\ddot{x_{a}}+2\omega_{o}^2x_{a}-\omega_{o}^2x_{b}=0[/LATEX] and [LATEX]\ddot{x_{b}}+2\omega_{o}^2x_{b}-\omega_{o}^2x_{a}=0[/LATEX] I use 2 trial functions [LATEX]q_{1}=Acos(\omega t)[/LATEX]and [LATEX] q_{2}=Bcos(\omega t)[/LATEX] and get two solutions for the normal mode frequencies: [LATEX]\omega_{-}=\omega_{o}[/LATEX]and [LATEX] \omega_{+}=\omega_{o}\sqrt{3}[/LATEX] Now to get the motion for [LATEX]x_{a},x_{b}[/LATEX], I am supposed to take: [LATEX]\frac{q_{1}+q_{2}}{2}[/LATEX]and [LATEX] \frac{q_{1}-q_{2}}{2}[/LATEX] My questions:…

Hey guys, Im trying to answer a study question for a Biochemistry lab. We pretty much isolated the enzyme acid phosphatase from wheat germ and measured its V0 (initial velocity). The question was "How much acid phosphatase is present in 1g of wheat germ?" Does anyone know how to go about answering this problem? Ive attached a copy of the lab if that helps.. I could use all the help i could get! Lab 4 - Enzyme Kinetics.doc

Hey, I lost my book for the subject and test is on Monday, these are the problems I'm having trouble with, I need to know the formulas to use as they were in the book which I've since lost.. FIRST QUESTION What is the torque required to accelerate a turbine undergoing a dynamic balancing test from 0 to 15000 r/min in 80 seconds, it's mass moment of inertia is 11.5kg.m2 Torque = X (unknown) Time = 80 Acceleration = y (unknown) Mass moment of inertia = 11.5x9.8 = 112.7N.m2 15000x60 = 900000r/s (divide by time in seconds to find acceleration) 900000/80 = 11250r increase per second .. I can tell I'm lost SECOND QUESTION I can't find a question I copi…

so i have this windmill specs for single wing L=40 meters B=4 meters Area of wing is 80 m2 what equations will i need for figuring out how fast it will turn at a given airspeed?

Im working on an assignment for my HND at the moment and stuck finding info for the last part of a question as follows: "parallel resonant circuits are very commenly used in telecommunications. Why are they prefered to series resonant circuits in telecommunications applications?" can anyone help? I would greatly appreciate it! thanks Mark

I'm having difficulty understanding what this problem is asking of me. "Does the Laplace transform have a fixed point? Is there a function [math]f(t)[/math] defined on [math] 0 < t < \infty [/math], such that [math] \int_{0}^{\infty} f(t)e^{-st} dt = f(s) [/math] There is an extra condition that [math]f[/math] is not identically 0." I can use Laplace transforms as a general rule, but I do not quite understand what they mean mathematically. This question seems to be addressing that mathematical meaning, if I'm reading it correctly. How should I go about starting this problem? What do I need to understand to solve this? Thanks.

Revered Members, Please see me my attachment. They are given in my textbook to depict paramagnetism and diamagnetism. When paramagnetic substances are placed in non uniform magnetic field, they have a tendency to move from weaker to stronger part Similarly, when diamagnetic substances are placed in non uniform magnetic field, they have a tendency to move from stronger to weaker part. Magnetic field is stronger at poles and become weaker when we move farther away from poles. But the diagram of diamagnetism shows that the liquid is bending towards the poles, that is stronger part of magnetic field which goes contrary against the property of diamagnetism. I fee…

I've been working on this worksheet for a while now, and things just aren't clicking in my head. Some help with some of the - in your opinion - hardest questions much obliged The image is quite large and the font is very small, but I'm sure you can make most of it out. The questions terminate at the end of question three, by the way.

Hey I need some help with a homework problem. I problem asks to convert the double integral from rectangular to polar coordinates and evaluate And since I don't know how to create the symbols I will do my best to write out the problem in English. The bounds of the outer integral are from 0 to a The bounds of the inner integral are from 0 to the square root of (a2_x2) The function being integrated is (x dydx) Thanks

Hi! The Mandelbrot set is defined as a fractal set of points c of the plan for which the sequence defined recursively by: Zn+1 = Zn.^2c with z 0 = 0 does not tend towards infinity (in module). useful property If there exists an integer N such that | zN |> 2, then the sequence diverges. graphical representation In practice we set a maximum number M of iterations. If the module does not exceed the value 2 after M iterations, we consider that the sequence converges and that c belongs to the Mandelbrot set. For purely aesthetic reasons, the Mandelbrot set is often represented with of colors. Color (black in the example above) is assigned to points…

I really need some help with this proof: If A and B are nxn symmetric matrices, and x is a column vector with x^t as it's transpose: Is it true that x^tAxBx = x^tBxAx? I arrived at this because I am trying to prove that the Generalized Rayleigh Quotient (Ax dot x)/(Bx dot x) has at least one critical point. If the first statement is not true, please help me with the second part. Thanks! There will be more proofs to follow after this if I run into more trouble, because the problem is multiple steps of proofs.

hello everyone. i've been trying to simplify this function (y' + x).(y + z). i've done a little simplification but i'm finding it hard to finish.. Here's what i've done = yy' + y'z + xy + xz (yy' = 0) = y'z + xy + xz the final answer is y'z + xy.. (i don't how to get here, i have no idea), and i also don't want to use K-maps.. Any help is appreciated very much.. Thanks..