Chemistry Definition and 993 Threads

With the huge interest in click chemistry for in vivo applications--the staudinger ligation and the Huisgen cycloaddition, I was wondering, just how viable are these reactions in real world settings? Assuming second order kinetics, the fastest ever reported Staudinger ligation click reaction...

Homework Statement A Chemist wishes to prepare 250mL of buffer that has a Ph of 4.50. Starting with 100mL of 0.12 mol L acetic acid and a supply of 0.10 mol L NaOh. 1) explain how this can be done 3) how much 0.20 molL NaOH must e added to this buffer to raise the pH to 5.1? 3) if the...

Homework Statement A particular sample of vinegar has a pH of 2.90. If acetic acid is the only acid that vinegar contains (Ka = 1.8 x 10-5), calculate the concentration of acetic acid in the vinegar. Homework Equations Ka = [Products]/[Reactants] pH = -log[H+] The Attempt at a...

Homework Statement http://www.xtremepapers.com/CIE/International%20A%20And%20AS%20Level/9701%20-%20Chemistry/9701_s11_qp_12.pdf question 10 Homework Equations The Attempt at a Solution The way I am doing it, is to get two equations in terms of x and y and then equate them. For the first...

I've read a lot of discussions about chemistry vs chemical engineering and everyone seems to favor chemical engineering, mainly for its higher salary and better job opportunities. Every discussion, though, seems to be referring to opportunities with a bachelor's and assume that the asker has no...

I've been doing some chemistry, and come up with a confusing problem that I can't seem to solve. It's a problem I made up while trying to understand the Gibbs Free Energy, but I will try to phrase it solely as a calculus question. It is known that \Delta G + \epsilon \Delta S < 0 and that...

Organic chemistry reaction Help . !URGENT! Homework Statement I can't type the O-Compounds so here's the Question http://dl.dropbox.com/u/41389643/Photo%2001-03-12%204%2047%2021%20PM%20%281%29.jpg Homework Equations The Attempt at a Solution This is the first time I came...

which is the best leaving group? Cl- enolate NR3 I couldn't figure out how to draw the enolate here, but it is a basic 3 carbon one. I believe the answer is Cl because resonance on the enolate will disperse the neg. charge. Am I on the right track or is there a factor I am missing?

Homework Statement Which is more acidic, and why? H_{2}SO_{4} H_{2}SeO_{4} Homework Equations The Attempt at a Solution Because Se is larger, it has a weaker Coulomb force with the H atoms. So it will more readily give up the protons of the H atoms. Hence it should be more...

Homework Statement So I'm doing a lab report on the reaction of food dye with bleach. I have a couple of questions: 1) What's the difference between pseudo rate constant and rate constant?? (i.e. k' vs. k) 2) How do I write the rate law for this reaction? I graphed the data and found the...

Homework Statement Find the product of this http://www.webassign.net/ksorgchem2/14-P-019e1.jpg The Attempt at a Solution I tried this but it is wrong. http://www.webassign.net/marvinimages/e/d/b3dfb33e165ce17f7b0a8bab7b9d9d.png Not really sure what to do now.

How does concentration of solution (So42) affect the voltage in a electro-chemical cell?

dienophile and diene help?? organic chemistry We never really covered how to do diels alder reactions and I am having trouble how to do these. Here is a photo of the lab page with the questions. I just need help with 2a-e and 3b-3d. Thanks.

So I am almost done with my Chemistry Major, but I really enjoy physics! Is it possible to still go into physics, maybe Chemical Physics, Astrochemistry, or Material Science. I don't want to start over, but can I still go into graduate school in Physics?

Homework Statement A cube of gold is heated to a temperature of 94.2 degrees celsius, and then submerged in 31.3 mL of water at an initial temperature of 28.7 degrees celsius. If the final temperature of the water is 45.6 degrees celsius, calculate the volume of the cube of gold (s=0.130...

Our chemistry book is a good textbook. It explains things well and in depth. The problem I have with it, however, is the exercise problems. Enough of the answers in the back of the book are wrong that it causes confusion with the proper way to solve certain problems (professor agrees and has...

Hello, I am a high school student looking for resources to prepare for the US National Chemistry Olympiad. I have already taken AP Chemistry (although my teacher did not cover a few topics, such as coordination compounds) and I did well in the class and on the exam. At this point, I need...

Hello. I've been reading this forum for a couple of days and noticed that it is a lot of people with Ph.D degree in different areas so I thought this was the perfect place to ask for such a thing. I am a 17 year old student and I find chemistry (Especially theoretical) very interesting. I...

Assalamu Alaykum (peace be upon u in arabic), First of all, sorry about the thread name, because once u read this thread, there is more to asking about a chemistry question. And as a new poster, i have no clue how to fix the names of the threads i post. I am a sophmore in high school...

Calculate the number of grams of sulfuric acid in 1 gallon of battery acid if the solution has a density of 1.26 and is 38.5 sulfuric acid by mass.

I am currently taking AP Chemistry in high school but I need help. The textbook we are using is the 8th edition of Chemistry by Thomson. however I find that it doesn't explain the math portions very good and is more about memorizing. I also have the Princeton review book on chemistry. Our...

Homework Statement What is the concentration of all ions after 600.0mL of 2.00 mol/L Barium nitrate is added to 100.0 mL of 2.50 mol/L sodium phosphate. The Attempt at a Solution I first wrote down the equation : 3Ba(No3)2 + 2Na3PO4 = Ba3(PO4)2 (solid) + 6NaNO3 I then found the moles...

I have to decide on what subjects I want to continue on for A level and was just wondering what I should pick as my last slot. I want to do Electrical Engineering at uni when I leave school. I'm really interested in either really big applications of EE like large HV plant stuff but also I'm...

Okay so I was just sitting around and thinking about Hydrogen (weird I know) when I realized that a hydrogen ion is just a proton. So how do we distinguish between molecules such as Cl+ (Chlorine with extra hydrogen) and HCl?

Any ideas what the inherent flaw in this experiment is? Homework Statement In the lab (actual lab), we combined copper(II) sulfate pentahydrate with barium nitrate to form barium sulfate (precipitate). Every group got a 115% or higher yield than stoichiometry would predict. Ba(NO3)2 +...

In basic chemistry courses you will learn that diaphragm prevents mixing of solutions between half-cells while maintaining ionic conductivity. What exactly carries charge through diaphragm if it's neither electrons, nor ions from the solution? What is the molecular mechanism behind that?

function: e^-(x^2/2) operator: d^2/dx^2 -x^2 The answer key says the function is an eigenfunction of the operator with an eigenvalue of -6. I can't figure out how to reach this conclusion. Also, Wolfram Alpha says d/dx(d/(dx)e^(-x^2/2)) = e^(-x^2/2) (x^2-1). Isn't this inconsistent with...

Homework Statement A carbanion is a species that contains a negatively charged, trivalent carbon. (a) What is the electronic relationship between a carbanion and a trivalent nitrogen compound such as NH3? (b) How many valence electrons does the negatively charged carbon atom have? (c) What...

Homework Statement Why do transition metals tend to form +1/+2 ions? Take electron configurations into account so that I can better understand this "easy" concept.2. The attempt at a solution I think it has to do with the s orbitals. These, I think are valence electrons that are easily lost...

I'm currently an Honours Chem student at UBC (I'd say a fairly reputable school), but I'm slightly disenchanted with the program. I absolutely hate organic chemistry, and there's just not enough math thus far. I'm thinking of either elaborating my degree so I do a Combined Honours in Chem and...

One cubic mile of sea water, with a density of 1.13 g/cm3 contains how many gallons and how many tons of sea water? 1 cm3/.001 L 3.785 L/1 gal 1 kg/2.2046 lb 5280 ft3=1 mi3 1.13g/1cm3 X 2.2046 lb/1000 X 1 cm3/.001 L X 3.785/gal After this point I get a bit confused...

I'd like to study Physics after Gymnasium (equivalent High School). How impotent is Chemistry in the different fields of physics? I still haven't decided which direction at all to do in physics, and I'm thinking what would be blocked by not doing Chemistry? I have Chemistry right not, but...

Homework Statement 4-isopropyl-2,5-octene or 4-isopropyl-2,5-dioctene? 2. The attempt at a solution 4-isopropyl-2,5-octene

Do Chemistry majors have to take the same calculus as do Engineering and Math majors? At my university (UC Davis), they do. I'm wondering if it is the same at your university or at most universities. I'm wondering because I'm considering majoring in Chemistry (switching out of Engineering), but...

Basic chemistry: sulphur dioxide shape??! I realize this isn't homework, but it's so basic I'm ashamed of putting it in the chemistry section. I'm trying to self-teach here, but my textbook is awful and I'm even worse. Question: Workout the shape of SO2. Step 1: Draw lewis diagram to work out...

I'm a junior in high school and among other advanced courses I am taking AP Chemistry 2 which is by far the hardest. Now I've had difficult classes before but I have a good work ethic and am able to work through them no matter how hard and come out with an A. While I still have an A in chem as...

could anyone please tell me where wold i find the ebook'inorganic chemistry by J.D. Lee' for free on the web.please suggest me a valid link.

As title says, how much chemistry would I need at the beginning of university level particle physics? If I decided to study it, would the fact that I don't have chemistry in my A levels could be a problem?

i have done the maths based on an online conversion calculator that said 1 liter of air is equal to 0.001m^3 in volume. my chemistry teacher tells me that my maths is wrong but won't tell me how... here is what i wrote: Failing the above, a larger crucible would hold more oxygen and the...

I want to improve my scientific language and broaden my vocabulary, what will for sure help me in writing my physics and chemistry essays. Can You recommend me any book, which kind I mentioned in the topic?

Hello all, I am rather new to these forums, and I have a question about lateral transfer between chemistry and physics. First, my background pertaining to physics: MATH: 3 semesters calculus 1 semester each: ordinary differential equations, linear algebra, abstract algebra, probability...

I see a lot of quacky sites about acid/alkaline body chemistry claiming that lemon juice and orange juice make the body alkaline. They both contain citric acid, orange juice also has lots of potassium... I cannot think of any mechanism whereby citric acid would somehow cause a persons body to...

Homework Statement 10.11g of CaO (molar mass = 56.08 g / mol) is dropped into a styrofoam coffee cup containing 157.0 g of H2O at 25.0ºC. If the following reaction occurs, calculate the final temperature of the water assuming that the cup acts as a perfect insulator. (Assume that the...