Homework Help

Question: The compound P has C,H,O and N as elements. A white pp+ was formed when P was acidified. Identify a structural feature of P which caused this precipitation. I was thinking on the lines of: maybe its an ammonium salt of long chain carboxylic acid [e.g.- (CH)5COO-(NH4)+]. When a strong dilute acid is added, the carboxylic acid will be formed and since its a long chain molecule, it will precipitate out of the solution? Am I right or is it some other obvious compound? Thanks for answering.

I don't understand what is going on in this graph. At the point e' there is a liquid phase outside the solidus line. The explination is that the diffusivity of the alpha phase is slower in non linear equilibrium phase diagrams. Point f'does not have the same liquid phase outside the solidus line. I guess my question is how do you determine when there will be no more liquid phase under the solidus line in a nonlinear phase diagram?

The reaction of cyclopentyl bromide with NaCN to give cyclopentyl cyanide proceeds,faster if a small amount of NaI is added to the reaction mixture.suggest a suitable mechanism to explain the catalytic function of NaI.

Thermodynamic processes in systems can be named as following: 1.Pressure remains constant-Isobaric process 2.Volume remains constant-Isochoric process 3.Temperature remains constant-Isothermal process 4.Thermally insulated-Adiabatic process 5.*************-Polytropic process Q1)In a piston-cylinder device, all P,V,T properties can change. What is the name for a such process? Q2)What is the physical condition for Polytropic process? Q3)For adiabatic process, mathematically we say that PV^r=constant Here r(gamma)=specific heat ratio For Polytropic process it is PV^n=constant Is this n can be any real number?

I've been working on a Biochem lab paper and for the life of me cannot figure out why our onium was stabilized and had a better buffer capacity then our carboxyl. Here's an excerpt from the assignment: Looking at your data below, the carboxyl pKa decreased by >2 log units, this means that the carboxyl on glycine is approximately 100 times stronger an acid than the carboxyl on acetic acid. Interestingly, we predicted a weakening of the onium pKa, but the difference in pKa of the onium is very small by comparison both theoretically and experimentally. Why is this so? Theoretical Experi…

Hi, I am confused on how the difference in pH and membrane potential of the inside of the cell and the outside of the cell is measured. Specifically, how does using a lipophilic cation help measure membrane potential? and how does measuring the concentration of weak acids and bases on each side of the membrane help measure the pH? Thanks!

the question was "to use a stretech of the human DNA genome (25k) as a unique identification tag what length of DNA sequence would you use?" The answer is below. I am struggling to figure out where the exponents and bases came from? "For calculations such as these, it is useful for purposes of estimation to remember that 4 5 =103 (4n produces the series: 4, 16, 64, 256, 1024; thus, 45 = 1024 =103) and that (1/4)5 ≅ (1/10)3. Hence, 4 different nucleotides can generate 1024 different DNA sequences, each 5 nucleotides long. Similarly, an 8- nucleotide DNA sequence can provide enough diversity to tag 25,000 ge…

Hey everyone, It seems to be a recurring problem for me, but whenever I'm presented with a question that involves "doubling the value or halving the value" of a variable in an equation, I can never get it right. In case I haven't made it clear enough, say you had the formula for Newton's Law of Gravitation: F = -GMm/r2 A typical question would be: What would be the new value of the result (from a previous question), if the value of "r" was quartered? Any help is greatly appreciated. Thank you

In studying the crops grown by farmers in an isolated village in central Asia, you make a most remarkable discovery – a new species of wheat. As described in class, modern bread wheat is an allohexaploid carrying haploid chromosome sets from three diploid species of wild grass. These are Triticum monococcum (n=7, haploid set designated the A set), T. searsii (n=7, haploid set designated as the B set), and T tauschii (n=7, haploid set designated as the D set). To explore the origin of the new species, you cross it to each of these diploid grasses and examine the chromosome pairing arrangements of the resulting sterile F1 hybrids. The results are as follows: …

For the ground state, the electron in the H-atom has an angular momentum = h , according to the simple Bohr model. Angular momentum is a vector and hence there will be infinitely many orbits with the vector pointing in all possible directions. is it true?? pls tell why???

Hi guys! Here are some questions about the structure of the compounds. Could somebody help finish this questions? many thanks!

Hello everybody How is it going? I hope everything going well. I am having an exam in an intro bio class I am taking in two days, and I need to do this practice one before the exam day. I did it, but I need to check my answers with you. Unfortunately I could not find the answers key. could you please do it, it does not take time if you know the material " But I really need to check my answers" Thank you so much in advance.

Of course I want and strive for perfect scores on every assignment, but this one is extra important. My grade comes almost entirely from three tests and I screwed up the first one. This is about my only opportunity to make up for that dent, and in addition, the last question on this assignment adds five raw points to test 1. The assignment is 8 questions long and contains mostly chain rule problems. Attached are 5 scans: 2 are Front/Back of the Assignment Sheet while the other 3 are Front/Back and Front of my attempts to solve. This is rather lengthy of a task to ask someone to review, so feel free to see if and where I went wrong on one or two of the problems and…

This is what I did... Should it be -5? What am I doing wrong?

[math] y= x^3[/math] [math] y+dy= (x+dx)^3 [/math] My question is how would i go about cubing x+dx? I can use the foil method easily with squaring, but i can't quite see how on this.

Procedure:A copper wire is polished by a piece of steel wool. Then it is placed into the hottest part of the Bunsen burner (blue flame) for 20 seconds. What is the product produced, and a balanced chemical equation?

~45. Olylnpic target archers shoot .urows at a bull's-e~l-'e 12 cm acrQ<s from a distance of90.00 m. If the initial speed of the arrow is 70.00 mis, what must be dIe elevation angle? If the archer misaims the arrow by 0.03" in the vertical direction, will it hit the hull's-eye' Ifthe archer misaims the arrow hy O.O:~o in the horizontal direction, will it hit the bull's-eye? Assume that the height ofthe bull's-eye above the ground is the same as the initial arrow height of the bow and ignore air resistance. How could i possibly find this deviation?

so our science teacher has given us what she says is the most important assignment of the year...a science project of our choosing. After deciding to do a rocket experiment on how large of a rocket it takes to mover a 5 pound object x amount of yards, I decide to google a few things about rockets. I then find i dont know anything, and that "rocket science" is actually kinda complicated 0.0...if theres anyone who can help describe to me in easy terms the basics behind rockets, how the work, what its going to take to move a object, and so on so forth, I could really use some help.

their is no specific problem I need help on but a operation we have used in my class frequently which I don't understand. the elimination method for solving linear systems of equations it has something to do with taking the coefficient of a variable in one equation and making it the opposite of the coefficient of the same variable in the other equation then eliminating (doping I guess) them from the equations. can someone explain how this works and perhaps frame a few examples?

How do i find the square root of a negative number....? Lets say [math] \sqrt -4 [/math] My calculator gives me the answer 0 is it because [math] -a(-a)=+b [/math] where a equals -2(i assume -2 should be its squared root but its not)

Hi Guys, I have to make project on Dengue Fever ( Dengue Fever Causes, Symptoms, Treatment ) , And I don't have much Idea about this. So pls help me- -How the Dengue test is conducted - What medicines are used etc. Pls help me.........

So for my Bio Lab, I have to write an essay on the spread of cancer throughout the body. Like how and why the cells separate from primary tumour and spread to other parts of the body. I read some scholarly journals but, to be honest, they were totally beyond my knowledge of cancer. They were so in depth, and I'm trying to just weed out the core concepts, since this is an intro class. I came up with some key words, like metastasis and clonal dominance theory, but I can't find anything providing a simple explanation of what clonal dominance is or a list of its major tenets. Is the clonal dominance theory not even a theory yet, and just a hypothesis? Because somewhere I rea…

Before saying anything, sorry that my first post on this forum is looking for help. Thats not a good thing, I know. I do intend to post more. Anyway, for my A-level physics coursework I need to give a presentation on a material of my choice...most of the other people in my class got the easier materials / materials with more information on them - I'm stuck with human bones. Ok, any links to information or websites would be really useful. Here are the main topics I am doing about: How strong is the bone? I need to talk about the breaking stress and include some of the young modulus in there too. I need some data about that and possibly compare to other …

I'm reading the intro to calculus on the forum and i'm confused... Basically it states [math]f(x) = (x - 2)(x + 4)[/math] and to find it's derivative you basically have to add the product rule formula, but i got completely lost at the last step,which is is where i need help at, and by the way would it not have been easier just multiplying the function at the very start... I mean i see that in the last step all that was done was just flipping it and then multiplying..

I have been asked to translate into English a number of statements written in set notation based on this introduction. Can somebody talk me through exactly what is being said here? Also, two of the questions use "." to separate terms. I know "Ǝ" means "there exists" and "∀" means "for all"... but what about "."?