Homework Help

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…

So my teacher, as we made the multipole expansion of Vector Potential (A) decided to proof that the monopole term is zero doing something like this: ∫∇'⋅ (J.r'i) dV' = ∮ r'i J ndS' = 0 The first integral, "opening" the nabla: J⋅(∇r'i) + r'i(∇⋅J) this must be equals 0 J = current density vector n = unit vector My question: I didn't get why the last thing (the nabla opened thing) was zero... He couldn't explain quite well and got confused, then the next day he added one condition to that be zero: [*] J is defined only in a certain region of space and that's why it's zero. I didn't get at all... *Sorry for my bad english

Hi, just needed some help in answering a past exam paper question which is as follows: "Draw the Radical Distribution Functions for 1s, 2s and 3s orbitals and point out the important features of these graphs". ​After looking through my notes the graphs which I found that correspond to the "Radical Distribution Functions " are : First question Is are these the right graphs? Even though they are titled "Radial Probability Functions (RPF’s)". ​Also there was no information regarding the second part of the question in regards to the "important features of these graphs." I tried looking online and was finding it hard to find anything, can anybody point …

Hello, I am a level seven student, and I would like to ask a question for my science project, and i did an experiment about the change in our body temperature after eating spicy food(and we choose the second most spicy noodles in the world ). The result shows that it actually lowered the body temperature, so I'd like to know why this phenomenon happens. I've done some research and i know that its because of sweating, but which body part produces/control/command SWEATING and some other information. So, i would like to know: -Which body parts -Whats Homeostasis -Whats Thermoregulation -Chemicals affecting body temperature -Capsaicin affect out temperature by? ~BRAIN…

Question: A sample of a compound of N and O reacts with excess H2 (g) to give 0.123g of NH3 and 0.325g of H2O. Determine the empirical formula of this compound. Been trying to solve it for a few days. My chem teacher wants the class (Grade 11 chem) to solve the questions on our own for prep for the unit test but no one else knows how to do this. I tried finding % composition to get to Empirical Formula but I got nowhere with it. I also tried doing mole ratios but I font have molecular mass of the unknown compound to find the mass of it. I think I need to get the balanced chemical equation but I don't know how to. Can anyone help me? Any hints? or where to star…

Hey every body.. peace be upon you. well i have to make a science project for our university science fair. i am thinking of making Discharge tube. can anyone guide me? how to prepare it... have you experience of it? or any other idea?/

Hi. I'm just a homeschooling mom teaching my son some basic botany. We did the potato experiment. After a number of weeks, some leaves grows from the eyes, But no roots was formed. I wonder what went wrong, or I need to wait more? Thanks

Do electrons revolve around nucleus because of centrifugal force or something else ?

I want to use the factor theorem to find the factors [math]2x^3+x^2-13x+6[/math] How do I do that?

Can [math]y^2-2xy-3x[/math] be factored? I tried to do it: [math]y^2-(2y-3)x[/math] [math]\rightarrow[/math][math]y(y-3)x-1(y-3)x[/math] and that finally gave me [math](y-3)x(1+y)[/math] Is this correct?

I need to find the stoichiometry between the reagents in order to find the theoretical yield. Please help I have no idea whatsoever how to do this.

I need help with this: I need some explanation when it comes to dealing with partial fractions. [math]\frac{7x+19}{(x+1)(x+5)}[/math] into simpler fractions.[math]\frac{7x+19}{(x+1)(x+5)}=\frac{A}{(x+1)}+\frac{B}{(x+5)}[/math] Why did[math]\frac{7x+19}{(x+1)(x+5)}[/math] become equal to [math]\frac{A}{(x+1)}+\frac{B}{(x+5)}[/math]?

Hello, my chemistry topic is all about Metallic substances and their properties. I read that Annealing (which is heating just below melting point and allowing it to cool slowly) causes the metallic grains to expand in size. Why is that? Like, does heating a metal decrease grain size or something? What does heating do the the metallic structure? We're not being told why it happens, we're told it just does. Please help.

In the attached picture, The reaction will go under certain mechanisms to give us the shown product , now to reach the final product we should know all reagents that help us to do the mechanisms. Can somebody help me actually there are 2 mechanisms.

I am posting in this subforum * because I do not know if this is actually the accepted theory (or one of them) and if I am just a slow learner..... This is my question.: Does mass and energy curve spacetime because spacetime , firstly is just a mathematical model with lines along parallel to the 4 axes that meet at all the points {x,y,z,t} that are the set of all possible events? In the real world (not the model) there are areas of mass/energy where "events" cannot take place because the "spot is taken" . As a result ,for the model to be accurate we have to make a "detour" ** around these particular areas when we draw the lines parallel…

Hey! So I've to write a 2000 word essay on the similarities and differences between Huntington's and Parkinson's regarding 'molecular pathology'. However, I've driving myself mad trying to understand this - given that there is so much information out there on these two disorders. I know I've to at least talk about the genes involved, CAG repeats, and Ubiquitin. Can anyone explain briefly to me where the difference and similarities actually lie between these disorders? Thanks

I have a theory question this time ... case 1 if I have two plates and theres a potential difference (p.d) across them 250 v ... an electron is fired from one end to the other end with some speed v m/s Case 2 Now I take the same plates same p.d however the plates are not uniform this time..... willl this have any effect on the speed of the electron? Compared to case 1 ... or will the time change?

Hello, I have a problem where I have a 1 dimensional Finite Difference Time Domain program simulating an electromagnetic wave, classically using Maxwell's Equations and the Yee Algorithm. What I would like to do is define an "effective" photon wavelength at every grid point (I don't know if it even makes sense to do so). The way I am trying to do this is; 1.) I have the electric and magnetic field magnitudes at every grid point: Ex, Hy (the simulation is Transverse Magnetic). 2.) I calculate the energy density of the wave at each grid point: EnergyDensity = ((Ex^2)+(Hy^2))/2 3.) I multiply the energy density by my spatial unit step cubed to get the total energy …

I am given the solution of NaCl and it has a mass of 53.2 g and a molar mass of 58.44 g. I already know to how to find the number of moles for the entire solution, but I also need to find the number of moles for Na + ions. How exactly to I go about doing that? Thanks in advance!

For parts A and B of this problem, use the following standard reduction potentials, free energies, and nonequilibrium concentrations of reactants and products: atp=3.1mM glucose=5.1mM nad+=350micro M Pi=5.9mM pyruvate=62 micro M nadh=15micro M adp=220 micro M co2= 15 torr half reaction NAD+ + H+ +2e- --> nadh E0 (V)=-0.315 2 pyruvate+ 6H+ + 4e----> glucose E0=-.590 pyruvate + nadh + 2H+ ---> ethanol + nad+ + co2 delta G' naught =-64.4kJ/mol adp+ h2o --> adp + Pi + H+ delta G'naught=-30.5kj/mol a) consider the last 2 steps in the alcoholic fermentation of glucose by brewers' yeast: pyruvate + nadh + 2H+ ---> ethanol + nad+ +…