Homework Help

what will be the difference between these two reaction in thier mechanism and their product .

how can we see the order of decreasing reactivity for the following X substituents in SN2 reaction I X = OH- II X = CH3CO2- III X = CF3SO3- IV X = CCl3CO2-

An iron wire is inserted in a pH = 1 solution. Describe the phenomena that will take place, give the reasons for your answer and calculate the species concentrations when the chemical equilibrium is reached. (Assume pressure and temperature correspond to standard conditions). Suppose the final solution in the previous experiment is placed in a container (A) and an iron wire is immersed into it. It is connected with a copper wire immersed into other container (B) that contains 0.2 M Cu2+ solution. Is this system a galvanic cell? If your answer is NO, say why. If your answer is YES, calculate de electromotive force and the hall-cell potential when the equilibrium is reached…

Hello, i am so lost on these questions. Ive been watching heaps of YouTube videos reading my textbook but i have no clue how to even start with these questions. My textbooks are very general so i dont know how to solve more specific problems like these. Any pointers would be greatly appreciated.

The researchers who investigated bioluminescence and quorum sensing found that E. coli transformed with a plasmid containing a 9 kb fragment of V. fischeri DNA could glow when the cell population was dense. They mutagenized these E. coli cells and isolated many mutantions that map to the 9 kb fragment and prevented the cells from glowing. They then performed complementation testing with these mutants by transforming E. coli cells simultaneously with two plasmids, each containing the 9 kb fragment with one of these mutations. To ensure the E coli cells were transformed with both plasmids, one of the two plasmids had a gene conferring resistance to ampicillin, while the oth…

We have to find the compound C . Why the product I formed is wrong and how is the correct product is formed .

I am stuck on figuring out why the following function is a increasing function when I read a paper. The function is following where where , and the independent variable x is on interval . I have plotted the function curves of f(x) with different c by the following, and found that it seems to be monotonic function. However, it is too hard to me to prove it. The first derivative of f(x) is by the following: The second derivative of f(x) is by the following:

hi i cant work this out Its is estimated that 0.3% of a large population have a particular disease. a test developed to detected the disease gives a false positive in 4% of tests and a false negative in 1% of tests. a person is tested positive for the disease. what is the probability that the person actually has the disease? i was told my teacher that the answer is (probability of having the disease)/(probability the test is positive) i can work out the probability of having the disease but i cant work out the probability of the test being positive the probability of having the disease is .003. what is the probability of the test being positive i cant work this o…

Hi, I am supposed to fill in values in a table for θi and θr (I am also supposed to find the sine of θi and θr, but I should be able to do that easily once I figure out how to find those values in the first place). I am only given the values of n1 being 1.00 and n2 being 1.50. Just doing a basic search on the internet, it seems like I might need to cross multiply somewhere, but if so, what should I cross multiply? I am being told to use Snell's Law here. The formula for that is n2/n1=Sin θi/Sin θr. I am not sure how to apply the formula for both of the values that they are wanting me to find. I would really appreciate it if someone could show me how to find these …

Could someone help me to solve my chemistry problem? 15 ml HNO3 are neutralized by 30 ml KOH. and beside that, 20ml of this solution of HNO3, after having reacted with 0,700 gr of Na2CO3, are neutralized by 25 ml of the same solution of KOH. Find out molar concentration of both solutions Thank you very much for helping me HNO3 + KOH->KNO3 + H2O 2HNO3 + Na2CO3->2NaNO3+ CO2+H2O

While reading about Ultraviolet Catastrophe from a book its confusing me with Black Body radiation.. Can anyone help me out explaining this topic in an easy way?

How do I show, prove, see or be convinced that [math]-\frac{bp}{cp-a}=\frac{bp}{a-cp}[/math] I am concerned with what is going on in the minus sign there. I do remember that the following holds: [math](-)(-)=+[/math] Or that [math](-1)(-1)=+1[/math] or just 1. I also remember that [math]\frac{(-1)}{(-1)}=1[/math] or just 1 or that [math]\frac{(-)}{(-)}=+[/math]. What can I make of these identities in being convinced or cleared of what is obscured to me.

If I multiply [math]\frac{a-n}{a+n}[/math] by minus sign, do I really get [math]-1[/math]

How to prove the following function is decreasing function? f(x) = (cx-c*x+x-1)/(2x-x-1), where 1<c<2, and the independent variable is on interval (0.5,1).

RN1 = 3000

Does anyone know of any good Image analysis softwares for analysing gel electrophoresis images?

you are a professor who believes that our brains work very much like a computer in terms of learning, storing, and retrieving information. which of the following theories would you most likely agree? A.Vygotsky's B.biocognitive C.information processing D.Piaget's

Hey guys! Stuck on another one. See the image below. This one can also occur in only five steps. My thoughts: I turned the aldehyde into a secondary alcohol by adding a grignard reagent (I'm not quite sure which grignard I should be adding here), then I oxidize turning the secondary alcohol into a ketone. This is where I get stuck because I want the double bonded oxygen to move over a carbon, how do I do that? And how can I add the alkyne again in regards to this problem? Any help or input would be appreciated! Thank you so much!!

Hey everyone! I'm really struggling with these multistep synthesis problems. Any input to push me in the right direction would be greatly appreciated. For the following problems (see images below), what are the reagents to achieve this transformation. My thoughts: For the first image: It is supposed to occur in two steps and I believe it would involve a grignard because you add carbons, but I don't know if I should turn the alcohol into a ketone. And if I can just add a alkyne as part of a grignard reagent? For the second image: This is supposed to occur in five steps. I added hexavalent Cr to oxidize the alcohol, which turned it into a secondary ketone…

On the photo attached we had to draw a mechanism for the creation written at the top of the page. My attempt is written beneath it although I'm fairly certain it is to correct. I'm comfortable with the reaction for acetal formation from ketones and aldehydes but wasn't sure how to approach this one. Any help would be very much appreciated!

Hello, I am really struggling with some basic things related to regression tree. Mainly I do not understand how I am suppose to calculate square error and form the recursive partition. Here is the set-up: I have a dataset $\{((1,1),9),((1,2),-4),((1,3),2),((2,2),4),((2,3),2)\}$ and I need to find the regression tree corresponding tot the greedy recursive partitioning procedure with respect to square error. And then I would like to draw the recursive partition. I literally have no idea how to even start solving this and it does not seem too difficult as well. Could someone help me out and possibly put detailed solution or partial solution. Anything will be helpf…

Just going through lattice structures, was finding it hard to identify the number of spheres in unit cell, the two which I struggled with were: I know that this lattice represents a compound such as ZnS The coordination number is 4:4 for both white and black spheres. The number of white spheres (face centred cubic lattice) in the unit cell is: (1/8 x 8) + (1/2 x 6) = 4 The black spheres (tetrahedral holes) I am having problems with, my guess is: 1 x 4 = 4 The reason I calculated it to be 4 is because only half the tetrahedral holes are filled, normally for a structure like Na​2​O there are 8 white spheres inside and they are all counted as entirely inside. So if t…

I am currently in 7th grade(in the United States) and I am tackling Algebra 1, if you guys can just post some tips I should keep in my head while I am doing it so I don't go off track and teach myself the wrong way. I did that once and had to relearn a large portion of science when we got to it in school because I learned it wrong. In a note I am teaching it to myself, that's how I learned it wrong. Although I don't personally have much hope for common core math. Thanks!

What is Black and White Report..??

Had a question relating to Schematic diagrams, just going through a past paper and the following two question came up: What is peculiar about these structures? Why are these structures stable? For Question 2, after having gone through my notes I answered: Layer structures are intermediate between: A totally ionic crystal with regular arrangement of ions and strong electrostatic forces. A crystal in which small discrete molecules are held together by weak forces such as van der Waals forces and hydrogen bonds. Hence the reason for their stability. ​I am stuck on Question 1 that asks "What is peculiar about these structures?". The only answer that…