Homework Help

Propose a synthesis of the following target molecule using benzaldehyde and furan as the major organic starting materials. In your synthesis, note the potential problems that may be encountered.

I am supposed to make notes explaining the exact mechanisms for these tests: Molisch's test, Anthrone test, Benedict's test, Barfoed's test, Bial's orcinol test, Seliwanoff's test, Osazone test All I could find are sh***y notes from my seniors who can't even spell 'Molisch'. All their structure diagrams are, to put is mildly, retarded (some carbons have 5 bonds etc.). Please help me find the exact structures of the reagents involved, the exact mechanism of the reaction, what's the test for etc.

Hello Guys! I'm looking for a Biology Investigatory Project. By next year, we will be defending our IPs. I can't find any so can you guys help me? I'm looking for a medium difficulty Investigatory Project. Thank You Very Much!

I'm faced with the following problem, which I think I have solved, but I need to know if it belongs to a general class of problems incombinatorics and whether it is mentioned in books so I can refer to them. Let's suppose we have N symbols we want to assemble in a certain order. Say we have the symbols A, B, C ,D ,E and F in the following order 'ABCDEF'. We want to know how many words formed by the same symbols (or alphabet, but each symbol has be used only once) will share no symbol at a given position with the reference word 'ABCDEF'. For instance 'BADCFE' is one of such words. In general, the number of such words is given (recursively) as: C(N) = (N-1)* (C(N-1) …

I have some data with defined standard error. I should calculate the ln() of each data. do you know what would be the error of new data?

Can someone please answer the question? I don't understand the definitions given in the book or on google. Does anyone have an easier way of explaining it to me. Thank You

I am busy studying for an exam and I am stuck on a particular question. I am not sure how to relate the flow rates to each other without getting more than one variable in the final equation. When I get one variable it solves incorrectely because you using four equations that become dependent when you relate more than two variables. Picture is down below. I may be over complicating something but I am stumped at this point in time. Any help would be much appreciated.

In my problem each node is associated with some metric. At each step only a subset of edges are candidates for contracting or merging. Contracting one edge may affect the subset of edges that are legal for contracting at next step. By contracting one edge, we also replace the metrics of the two endpoint nodes with a new smaller metric. We are trying to find an H such that the sum of the metrics of nodes in H is minimal

calculate the full load primary and secondary currents of a 60 kva transformer with turns ratio of 165:6 fed from a 6.6kv supply and the answers are 9.1a and 250a my answers are different can anyone tell me if this is right and if so how? thanks

Hi, I am really stuck on this question, can someone please help me how to do it ? A sample of plasma was assayed and the absorbance was found to be 0.35. 0.95ml of this sample was mixed with 0.05ml of the 100mmol/L urea solution and the mixture was assayed. The absorbance was found to be 0.45. Calculate the recovery of the added urea and comment briefly. Recovery = ?? % Please help

Hey guys, I'm having trouble working out this genetic problem (it is a three part problem) : The drosophilla mitant traits vermillion eye (ver), wings absent (wab) and crowssveinless (cvl) represent vermillion eye colour, no wings and no crossveins in the wing, respectively. A male with vermillion eyes and wings absent was crossed to true breeding crossveinless females. Of the F1 progeny, half of them had the wings absent phenotype. The F1 females showing this wings absent phenotype were then crossed to a true breeding individual showing the vermillion eyes and crossveinless phenotype. The phenotype from a total of 1000 progeny were as follows: wildtype 6 c…

I am seriously lost with Proofs. I am allowed to use Rules of Inference (MP, MT, HS, Simp, AD, Conj, CD, and DS) and Rules of Equivalence (AB, Dem, Com, Assn, Dist, DN, Cont, MI, EX, ME, and RE) Here are the ones I am working on right now. Any help would be greatly appreciated. #15 1. (A∨B)∙(A∨G) 2. M→~A 3. ~Q→(~B∨~G) ∴ M→Q #16 1. Y∙(~N∨A) 2. ~Y∨N 3. (A∙Y)→~~K ∴ K #17 1. ~G→~F 2. (~F∨G)→(H∨J) 3. H→Z 4. J→~P ∴ P→Z #18 1. (D∙E)∨(~D∙~E) 2. (H∙J)→~(D↔E) 3. ~~H∨J ∴ J↔~H …

Can someone please answer the abbove question for AQA Chemistry Unit 1. about the plate tectonics Thank You

We are told in 10th class that electropositive (like alkali metals and alkaline earth metals) elements and electronegative elements (like halogens) form ionic compounds such as sodium chloride. But now in 11th class we are told that lithium and beryllium (which are too alkali and alkaline earth metals respectively) and some more metals do form covalent compounds. Why should lithium form a covalent bond with chlorine if lithium can donate one electron and chlorine can gain one electron easily to form an ionic bond ? Its a bit confusing...

Hey everyone, I'm doing my coursework for mathematics, the marks deduced from wrong answer is considerably huge. I am prone to mistake so I will take safe step by checking my answer here. Hope anyone can give a hand! note: I'm student of SPM, O-lvl equivalence. so, basically there no "hardcore math" here. though so it's recommend to use for higher mark. (silly marking) Section A, Part II. Cute Bakery produce 600 packets of muffin per day with each packet containing 5 pieces. Each muffin has a mass of 20g. Shop operates 5 days a week, eight hours a day, has three employees who each of them receives a salary of RM 150 per day. As a financial planner f…

Estimate the %CV for the urea assay at two concentrations and comment on results? Using the data in table 1 which is below. (Table 1) Vol urea stock = 2.5 ml Vol of creatinine stock = 1.25ml Diluent = 6.25 ml total vol is 10 ml (Table 2) Absorbance (low) Urea concentration (low) Absorbance (high) Urea concentration (low) 0.25 0.67 0.252 0.72 0.26 0.70 0.24 0.65 0.238 0.68 0.245 0.715 0.251 0.63 0.161 0.645 0.25 0.68 0.245 0.75 I am told that I am supposed to use the concentration values to calculate CV% and not absorbances, but I have no idea how to get the concentration values ????

Hi all, I am trying to model temperature variation with time of compressed air energy storage in a salt cavern. For now I have considered a spherical (hollow) cavern in which air is injected. I have to solve {T}+[M]{T_dot}={Q} (here, Q is the first term and all other entries are zero). My question: I am trying to get an expression for Q as a function of time. It will constitute (heat from injection + heat from convection + heat from conduction through the rock mass), right? Only heat from conduction through the rock mass is time dependent in my expression. Q_inj = m_dot*Cp*(Tinj-Tair) Q_conv = A*h*(T_cav.wall-Tair) Q_cond = V*rho*c*(Tinit-Tamb)*exp(-t/k)…

Hey I just had a recent science experiment with benedict's solution and egg whites. I would assume there would be no monosaccharides present, however, the test yielded a purple colour. From searching online and my previous knowledge, purple is negative result, but perhaps a positive result? I was thinking when the Cu (II) ions become reduced they turned red which blended with the blue solution to form a purple colour, I discovered the composition of Egg whites had 4% glucose. Do you think this is a reasonable hypothesis? I thought about this as a contamination issue, however, there have been many results which other individuals yielded similar results, and my whol…

Hello, I came across this question and couldn't resolve it using the oxidation number method. Fe2+ + H2O2 --> Fe3+ + H2O Using half equations to balance it out, I got the right answer, though using the oxidation number method I got an alternate answer. Now the Iron is being oxidized, and the O2 is being reduced, with the oxidation number difference of 1 for both elements... What am I missing? The difference of oxidation number for oxygen should be 2... but I can't see how that works...

Hi, sorry if this is a stupid mistake or I should be ignoring Wikipedia, I'd just like clarity. As I understand it, the concentration of H3O+ ions in an acidic solution is denoted by (x^3)+(Ka*(x^2))-((Kw*x)+(C*Ka*x))-(Kw*Ka)=0 (where x is the concentration of H3O+ ions, C is the starting concentration of acid molecules, Ka is the acid dissociation constant and Kw is the auto-ionization constant of water. My question is, assuming that the above is correct (if it's not please correct me), is it safe to describe the concentration of OH- ions in an alkaline solution with (x^3)+(Kb*(x^2))-((Kw*x)+(C*Kb*x))-(Kw*Kb)=0 (where x is now the concentration of OH- ions instea…

If your not sure about this test.. it involves silver nitrate and ammonia? o.O actually lemme just type what the instructions of the experiment is..: 1. place about 5ml of unknown solution into a labelled boiling tube 2. add one drop of nitric acid to the tube with the unknown solution 3. add one or two drops of silver nitrate to the tube with the solution and silver nitrate 4. record the change you see in the table below 5. add three drops of ammonia solution to the tube with the halide solution and silver nitrate 6. record what you see in the table below 7. repeat using a clean test tube until you have results for all of the unknown solutions 8. only one anio…

what is the system of measurement used to calculate the vicious/viscious quality of a fluid? what is the formula to calculate this?

I have to present the attached paper in one of my course. I have too many difficulties to understand some part of that: 1- RRKM theory in this paper has been failed to apply and i do not get why? 2-in "Vectorial decomposition coordinate" section they have used reaction coordinate vector to measure the rate constant ratio. do you have any idea how they have done that? I checked the references and they were not that much helpful AccChemRes92.pdf

So jumping into a level chemistry I am self teaching myself and just wanted to double check I'm working stuff out right. Questions I have are 1. 250 cm3 of a 1.00 mol in a dm-3 solution I did 250/1000=0.25*1 = 0.25 Question 2 10cm3 of a 2.0 mol dm_3 solution I did 10/1000=0.01*2 (due to mol)= 0.02 mol Question 3 was find the concentrate in mol dm3 So 4 mol in 2dm3 of solution I did 4/2=2 mol dm3 And 0.0100 mol in 100cm3 of solution. I did 0.0100*10 as it asked cm3 not dm3 giving 0.1mol dm3 Finally last two. Again asking concentration 2 mol of NaOH in 4 dm of solution. I worked out molar mass as 80. Then divided by 4 giving …

I am working full time on my math, I have after some time realized that engineering is what I want to do. Therefore I need to do great things to my math and physics skills! As of today I work to go from complete noob to pro... Sometimes I just can't manage to understand a simple task Todays question is how come 6-(-5)x2+(-3)x5 is 1? (sorry, I just don't get this one. I end up at negative numbers or numbers which is larger than the number one)