Chemistry Definition and 993 Threads

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...

I was reading in my chemistry book about significant numbers. Also about measured and exact numbers. From what I understand, a measured quantity can be different than an exact number. The book said when comparing something, like 1 lb = 16 oz, it is an exact number because the two are the same...

Hello, I need your help on a calculation... I have 200 milligram dissolvable tablets, and a 3 ounce dropper bottle of water. How many tablets would I need to add to the water to make a 2% solution? The chemistry/math is a bit confusing to me because the tables are measured in mass (i.e...

Hello PF members , I am in class 10th presently in India. I want to be selected in engineering entrance examinations. In India best are IITs ( Indian Institute of Technology) Now there are certain coaching classes in India which prepare us for engineering entrance exams and consists of...

Hi everyone, I am currently a Junior Chemistry Undergraduate at UofA. I already made my decision that I want to apply for chemistry graduate school after I graduate from my undergraduate study. Based on several good discussions with other graduate students at my school, they all told me to take...

Hey guys, I'm really lost on this question...could somebody please point me in the right direction? Thanks!

I don't know where to ask this question, but anyways, since it was asked in an exam, so finding out the correct answer afterwards is a moral responsibility as a homework. So here I am. My question is whether the compound 2-Hydroxy-5-nitrobenzaldehyde (Did I named correctly?) gives positive...

I've been reading a lot over the internet that chemistry is a dead end career, and that it will be very hard to find a job with a chemistry degree. My dad on the other hand says that I should be able to find a great job as a chemist because there is a need for scientists in the US (He is an...

Homework Statement How much 2M HCl do you have to add to 5 liters of 6 M HCl, to obtain a 3.5 M HCl solution? The Attempt at a Solution I initially thought of something like m1v1=m2v2, but that doesn't seem to really work in this case :/?

Homework Statement Estimate ΔG for the process where one mol of ideal gas is subjected to an increase in pressure from 1.00 atm to 11.0 atm at 25.0°C. Homework Equations ΔG=ΔH-TΔS ΔH=C(p,m)(Tf-Ti The Attempt at a Solution Seems straight forward, but it seems i am not given...

So I am a senior chemistry (BA) student at a large state university and will be graduating at the end of the spring. I don't have steller grades (2.7 gpa) but this was because of my freshman/sophmore year. My transcript obviously has this divide where you can see where I started to take...

Homework Statement CH4(g) + 3cl2(g) ----> CHCl3(g) + 3HCL(g) How many grams of CH4 is needed to produce 50.0 g CHCL3 ? For this problem, I'll assume Carbon = 12 amu, Hydrogen = 1 amu, and CL = 35.5 amu.The Attempt at a Solution See the attachment (A PDF file), for my attempt @ the solution...

In our high school Chem 1 Class, we had this lab where we went around doing simple experiments and determining whether the change was a physical one or a chemical one. Well, when one of the stations had be perplexed. At this station we had a Nickel Chromium Wire with an Aluminum...

Hello everyone! I was wondering if any of you know any schools that will provide full funding for students pursuing a MS in analytical chemistry in the US? I have done some research and there are many schools that state they provide assistantships to masters students but once contacted, admit...

Hello everyone, Just wondering how different the two really are. I'm interested in developing functionals and was wondering if the two are really distinguishable. On an added note, by the time I graduate, I will have had two research terms in computational chemistry. One applications, and the...

As the title states, what is the best book? The book I'm using now is Vollhardt and Schore. I don't like it very much. The book is very spammy, if you know what I mean. I'd like a book that builds on previous facts. My current book just presents facts with little relation to previous topics...

I have a test tomorrow and I thought I knew how to do these types of problems but my answers are all wrong. Here is the question: The solubility of CaSO4 at 25*C is 1.61x10^-2 mol/L. What mass will dissolve in 50.0 mL of water if the sample is only 20.0% pure? Heres what I did. First I...

Hey, I'd appreciated an answer to a really basic chemistry question. If I increase the volume of 1.0 mol/L hydrochloric acid from 50mL to 100mL, does that change the concentration? Will an antacid tablet dissolve more quickly in 50mL or 100mL of hydrochloric acid?

I have a couple of interviews coming up in the next few days but I don't really know what to wear. The first interview is for a quality assurance technologist position with a pharmaceutical company and the 2nd one is a research position (researching new adhesives) for an R&D company. I heard...

I'm really interested in how psychedelics and their alkaloids do what they do. I'd really like to get a graduate degree in organic chemistry with a focus on alkaloids or a subdivision thereof. But, I'm worried about how I'd make a living by studying things or things similar to things that are...

Homework Statement how would you make a 5pH solution from citric acid(1L) Homework Equations pH= log(H+) The Attempt at a Solution So I will try to work backwards from the [H+] antilog(-5) = 10^-5 M H+ needed this number can be divided by 3, because citric acid is...

Homework Statement 8) How might you prepare each of the following molecules using a nucleophilic substitution at some step? a) (CH3)3-O-CH3 b)CH3CH2CH2CH2CN Homework Equations none The Attempt at a Solution I'm really not sure what's being asked. I'm going to assume that I...