Homework Help

if you were to put one next to an electric meter,in theory what would happen?

Can anyone tell me the pKa value for tetrahydrofuran (THF)? I know it is the solvent I require for the reaction conditions in my answer and I know it's pKa value is higher than 25. However, it would be nice to know exactly what the pKa is. Please can someone advise me or (even better) direct me to a web-based list of solvents and their corresponding pKa values. Thanks

http://en.wikipedia.org/wiki/Leyden_jar could i make one with gold leaf instead of aluminum foil? or maybe just a soda can aluminum as opposed to foil? jw bc i have to make one for class and bring it in. OR! could i just electrical tape the outside of a soda can then wrap another soda can around it or gold leaf it and have that work? If im just WAY off base and need to reconfigure my design then go ahead and clue me in on that too.xD thanks

Im in my first year in university i have to write a report 10 page report on "methods and technologies used for geochemical exploration using stream sediment and soil sample" call me retarded but i dont exactly know what the question is asking or how to answer it am i suppose to basically display and write about methods on how we explore/study sediments from stream lines, such as lakes running off mountains and such and how their are different methods for different depths of the water bed to find different sediments? i guess the soil sample is also refering to how we do a chemical anaylsis of the soil, what we find at differnt depths, how we identify it …

Hey!! I am just having so much confusion balancing this equation by Oxidation method.I think it will be easy for you people.I will really appreciate your help.Its just I am very weak at balancing by different methods. Please do it step by step.Write on what you are doing.So that I can have it in my mind...thank you..I will really appreciate! By Oxidation number method FeSo4+K2Cr2O7+H2SO4--------->Fe2(SO4)3+Cr2(SO4)3+K2SO4+H2O

hi The following question I am stuck on: Some automatic titrators used in modern analytical laboratories measure the electrical conductivity of the solution in the flask as the titration proceeds. The equivalence point is determined by monitoring changes in the conductivity of the solution. These changes depend on the concentration and the relative conductivities of the ions in solution. The relative conductivities of some ionic species are shown in the table below. Ionic species Relative conductivity Na+, Cl–, CH3COO– 1 OH– 3 H3O+ 5 (a) Sketch the plot of conductivity of the titration mixture against the volume of NaOH added f…

I've mastered MOST aromatic substitution reactions, but I found one in my book that perplexes me. (Unfortunately the answer isn't at the back of the book.) In the reaction below, one might think that two products will form in a substituon reaction: an OH group in the ortho and para positions, relative to fluorine - since it is the least deactivating of the two substituents. However, something tells me that electrophillic substitution will occur since this is an acid-catalyzed reaction and it is carried out under warm condition. Therefore, the SO3H group will be replaced with a hydrogen, yielding simply, fluorobenzene. Can anyone enlighten me about which mechanism/pro…

Hey I'm new to this site, but I am sooooo stuck and I need help! What is the reaction of phosphorus with chlorine and how does the resulting product affect water? I've been searching online and I get different answers everywhere Also, why does Na form Na2O2 and/or Na2O with oxygen; not just one product? I'm confused about sulfur + oxygen too... because it can form either SO2 or SO3...

A replication fork: a) is only seen in prokaryotic chromosomes (NO) b) is only seen in bacterial cells (NO) c) is a Y shaped structure where both DNA strands are replicated simultaneously (should be NO as book calls it V shaped) d) is a site where one DNA strand serves as a template but the other strand is not replicated e) is created by the action of the enzyme RNA polymerase Thanks so much for any help.

Please help me solve this equation? (a to the power 9)-(b to the power 9) what is the reaction force experienced by a soldier shooting with a rifle? Plz help me Martin with explanation.

Not sure if it is homework but here it goes. I don't want an actual idea but..... I want to do a project related to aerospace. More specifically Astronautics. But I don't have a clue how to go about getting the resources or information to even attempt to accomlish this. Can anyone point me in the right direction? If it helps I life it central Florida if there is anything near me I have no clue!

Been working on a take home test for well over 10 hours now. The question is, "In replication, once the DNA strands have been separated, reformation of the double helix is prevented by:" Choices are a) DNA helicase enzymes b) helix-destabilizing proteins c) DNA polymerases d) ATP e) GTP I need help. I've looked all the answers up and am no closer to an answer now than I was at the start. Thank you!

atomic number versus atomic radius... is there any link??? for example; Hydrogen (H) atomic number = 1 atomic radius =25 is there any link? i have a graph with atomic numbers and radius's and now it is telling me to describe and explain!!!! aaaarrrrggggghhhhh

Hi, here's the deal. I'm in year 9 (3rd year of highschool). Currently I'm doing a Student Research Project. I've chosen an experiment to do which is the following: I'm going to build a model car. I will use a balloon to supply thrust to the car. I am going to change the wheel size of the model car to see if it affects the distance it travels with the energy supplied by the balloon. (ofcourse the size of the balloon would be controlled, and I would do this by measuring the circumference). My question is this: What would be a suitable material to build my model car with? It would have to be light enough so that the balloon could easily move it, but heavy e…

I having a bit of trouble finding a way to work out a couple questions on a chemistry question sheet which involve using the acidity constant to solve the endpoint of an indicator. First question involves methyl orange, and gives me Ka = 2 x 10^-4. It asks me to "Determine the pH of the endpoint for this indicator". But I'm unsure on how to do this? I know the Ka will equal [H3O+][conj. base] / [acid], does it involve using that equation? And the second question is similar, this time involving bromophenol blue (Brb). It tells me the colour change that occurs in each type of solution and gives me Ka = 6.31 x 10^-5. The first part of this question asks to determine …

• Atoms tend not to be very reactive if they: A. have more than two orbits. B. have complete outer orbits. C. have a combining capacity of +2. D. have incomplete outer orbits ??????????????????PLEASE HELP???

Or... something like that. Originating from an accidentally misfiled thread, I'm trying to find the t in this equation; [math] s = {v_0}t + \frac{1}{2}at^2 [/math] Normally I'd try to shuffle the values around, adding, subtracting, dividing etc. until I ended up with what I wanted, but I've long since forgotten how to deal with multiple exponents and barely remembering the terminology {let alone in English} didn't help finding an answer either. Would someone be so kind as to give me a pointer or two how to deal with this?

I got one question to ask: For two plasmids of the same size but one is linear and one is supercoil, which one will have a greater efficiency in the transformation into the competent cells and why? I think the linear should be more efficient because its less complex but I have found some websites that says that supercoiled one is more efficient so I'm not sure which is correct, I hope someone can give me your answer to this question thanks!

I have a few doubts in Physics, mainly in Vectors and Scalars. I asked my professor for clarifications, but I ended up more confused. So here you go: (please note: this was my first "advanced" physics lecture, since i finished the 10th grade, so I may have some really basic doubts that do need clarifications) 1) How do I resolve vectors into X and Y components? (for applying component rule of addition) 2) What is a unit vector? 3)I did not understand this relation at all: x = i ^ ( the "^" is meant to go above "i") y = j^ (same as above) z = k ^ (same as above) Can you'll please help me out? If I dont understand these concepts, my next lectu…

This is similar to my question about Gay-Lussac. I just need to know what Albert Einsteins specialization is physics was.

Hi I'm new to this forum hope someone can answer my question. I want to ask is the following outcome possible in Ligation and why 1) 2 plasmids joined together 2) 1 DNA strain religate on its own

pls!!! help me pls... i need a science project... tnx...

Hi, i have this hwk that i have to do, but i have been stumbling on it for almost a week, and still can't figure out how to do it... well.. if anyone can help, it will be really appreciated..... 1)the Ka of benzoic acid(HC7H502) is 6.28x10^-5. What is the pH of a 0.15M solution of the sodium salt of benzoic acid(Na+C7H5O2-)? 2)Ammonium carbamate, a crystalline solidundergoes decomposition at 450 degrees C in a closed vessel. The total pressure in the vessel at equilibrium is 0.843 atm. Calculate the value of Kp for the equilibrium. NH2CO2NH4(g) <-----------> 2NH3(g)+CO2(g) 3)A buffer solution is prepared from 0.250 moles of acetic acid(AcOH), pKa = …

Can someone please help me with the following question regarding the synthesis of sulfanilamide from aniline lab: Comment on the feasibility of the following alternative (see image below) as a synthetic route to sulfanilamide. How could this synthesis be modified to more successfully produce sulfanilamide?

My first post here...and I'm asking questions. I feel kind of like an ingrate for not participating and instantly demanding x_x But no matter...could I have some assistance with the following 6 problems? The help is VERY much appreciated as this is a summer assignment for a class next year and it's worth a lot of points, I think. Also, I have all the answers to the problems but I need to know how to solve them/get some hints on how to solve them. 1. Calculate the specific heat of water in units of kcal/lb*degF. (Given information: Specific healt of water = 1.00 cal/g*decC; 1 lb = 454 g, deg C = 5/9F - 32) 2. What mass of sodium nitrate is required to produce 5…