Chemistry Definition and 993 Threads

I brought a physical chemistry book by Wiley. Its printing is just awful. You can expect a printing mistakes in a fat (lack of vocabulary) book but this book is riddled with these. Eg :- Virial 2nd coefficient is given as ##b-a\over RT## instead of ##b -{a \over RT}## and best part, is that they...

At swim practice last week I started thinking about how the composition of the water was affecting how fast my teammates and I were able to swim. The mechanical properties of the water--viscosity, density, surface tension, etc.-- are what determine how much force swimmers are able to generate by...

After digging around the web to piece together a picture of the chemistry job market, it looks pretty abysmal. There are countless posts on other sites by disgruntled chemists complaining about working hard for advanced degrees only to end up in low-wage jobs with no benefits and minimal upward...

Homework Statement For this experiment we studied the equilibrium system CuCl42+(aq) ↔ Cu2+ + 4Cl-(aq) + heat Net reaction shift is observed by looking at colour changes -CuCl42+(aq) become green (shift to left) - Cu2+ is blue and Cl-(aq) is colourless (shift to right) What occurs when you put...

I'm wanted to do an experiment with interfacial polymerization; producing nylon 6,10 with sebacoyl chloride and hexanediamine. I was wondering what aspects of this reaction I could research, or what variables I can change?

Homework Statement In pyrrole the electron density is maximum on which carbon atom? so if the numbering starts from nitrogen, the carbon on the right side of nitrogen let it be numbered as 2 and the next one as 3 and so on... which of the following options will have the carbons of maximum...

Demonstrate the definition with a chemical equation for HCl. Express your answer as a chemical equation. Identify all of the phases in your answer. My Answer: HCl(g)+H2O(l)→H3O+(l)+Cl−(aq)What the answer said: There is an error in your submission. Make sure you have formatted it properly.

What do i have wrong here for my chemical equation? Seems to be right but my homework won't accept it. Balance the redox reaction occurring in acidic solution. Sn(s)+MnO−4(aq) → Sn2+(aq)+Mn2+(aq) Express your answer as a chemical equation including phases. 5Sn+2MnO−4+16H+→5Sn2++2Mn2++8H2O...

Background: 1st year freshman, CLEPed out of Cal I since couldn't take the class 1st semester (scored 79/80, so think that my knowledge in the subject is good enough). So, my degree plan requires that I take General Chemistry I and II. However, I am not the biggest fan of Chemistry and would...

Consider pure water separated from an aqueous starch solution by a semipermeable membrane, which allows water to pass freely but not starch. After some time has elapsed, the concentration of starch solution a. will have increased b. will have decreased c. will not have changed d. might have...

I was wondering if there were any possible experiments that I can conduct in a high school lab setting.

Does nuclear engineering require a lot of chemistry? Chemistry is not my strongest subject simply because I chose to skip it in high school. So I just wanted to know if it was heavily ridden with chemistry. And if so what topics do I have to look forward to. ugh...

One that occurs immediatly?

Hey everyone, I am a recent chemistry undergrad and just got an interview for a lab supervisor at a local college (undergrad) I know I will have to assume a lot of responsibility, and I am prepared for that. However, being my first professional opportunity, I have no idea what to expect. I know...

Homework Statement Determine the energy change, delta E, in J when 500 g of 229/90 Th undergoes the following nuclear reaction: 229/90 Th --> 225/88 Ra + 4/2 He The nuclear masses in amu or g/mol are: Th-229: 229.03175; Ra-225: 225.02360; He-4: 4.00260 Homework Equations delta E = deltam(c)^2...

I'm very interested in researching polymerization chemistry for my school science fair. All the ideas I have are either too expensive or not complex enough.

When I added a zinc plated iron ball into the acetone-peroxide solution, they zinc started bubbling. The solution turned whitish. Then after leaving overnight it became grayish with orange red foam on top

Hi everyone, My details: Age: 26 Education: Bachelor's in Mass Media; Post-graduate Diploma in Journalism Work ex: 5 years for an international news agency covering pharmaceuticals and healthcare. I loved science in high school and was great at it, but couldn't continue due to some unavoidable...

Hy , i m a chemistry beginner I m trying to be autonom in everything And i want to be able to make my own substances. For instances Chloroform , glycerine etc And many other basic substances So what do i need to study in order to make these substances correctly in a lab .

So I just had a question about calculating moles atomic iodine when you have the moles of molecular iodine. In the chemical equation IO3-(aq) + I-(aq) + H+(aq) = I2(aq) + H2O(l) Would the moles of atomic iodine be equal to the moles of the molecular iodine? or would the moles of atomic iodine...

I am interested in nuclear reactions, so the ultimate goal is to get into either nuclear physics, or nuclear chemistry. The thing is, I am torn between the two in which one to major in. Should I major in chemistry or physics first? The goal is to work alongside a nuclear physicist or chemist as...

Hello! I'm having a bit of an issue here, and I came across this site while searching on how to dissolve plant matter. The thread I found had some ideas, but said a reason would be needed before any concrete advice could be given. So here's my request - I need to instantaneously dissolve plant...

Hi. I have a question about Organic and Physical Chemistry. I have already finished General Chemistry I and II and got decent scores on both of them (B on both of them). I am interested in taking Organic Chemistry, then Physical Chemistry afterwards. I know that both are different from General...

The have to prepare the buffer but I really don't know how. Is the any formula for the buffer preparation? Ps. Sorry but one more thing, what does the "/" between Na2HPO4 and H3PO4 mean?

I always wondered why they say water and photons created the first microbes which later evolved and produced oxygen which filled our oceans and atmosphere. So how could have water existed without oxygen? I tried to look up and came up with different explanations, but it doesn't make sense.

Homework Statement Hi, I don't even know where to begin with this type of graph. It does say that the graph should be a straight line. This is for one of my questions for my lab that I am completing. This is the link of mytable with info...

I am stuck on this chemistry problem using Mastering Chemistry to do my homework. This is the problem. When I enter the answers it keeps saying is that "One or more of the units you entered is not recognized." **My Answers**For part A my answer was 426 g P2O5 and for part B 369 g...

I really like Chemistry. I like physics but not as much as physics. Is it likely that Physics Forums will intrigue me? I found this website trying to find the model on how to solve a chemistry problem but I really enjoy the overall quality of website and was thinking I would give it a shot.

So I keep getting this problem wrong and I don't know what's wrong. The structure I came up with is attached. If anyone can help I'd really appreciate it!

Hello, My 14 year-old son just started ninth grade. Last year in eighth grade in middle school, he completed a Regents ninth grade level science (living environment) class and its corresponding lab and a Regents ninth grade level advanced algebra class. He passed both Regents exams both of...

Homework Statement Why is ethanol a bad choice for recrystallization of phthalic acid? 2. The attempt at a solution I know phthalic acid is very soluble in water, so water is a great candidate to recrystallize phthalic acid. I also know water and ethanol are not miscible. But I don't know how...

In chemistry, chemical bonding is a very important topic. What I can't really understand is the interrelation of different theories which explains the same kind of thing, like for structure of any compound there are theories like Valence bond theory or VSEPR or molecular orbital theory. I am...

A rigid tank with a volume of 2.00m3 contains 5.77 kg of saturated liquid-vapor mixture of water at 75 deg C. Now the water is slowly heated. Determine the temperature at which the liquid in the tank is completely vaporized. Why isn't the temperature just 75C? If it is already a mixture in...

Hello everybody. First of all I want to make clear that this is not for me. I'll try to describe the kind of thing I want and the background that can be assumed. I am look for introductory physics and chemistry books. The background in physics and chemistry is zero. So the person this is for...

Is it possible to do a Friedel-Crafts reaction on a benzene and get a substituent on the benzene ring from that, and then afterwards add an NH2 group ortho? I know you can't add NH2 first and then do Friedel-Crafts because anilines cannot undergo Friedel-Crafts. Please advice. Thanks in advance.

I understand that the change in Gibbs Free Energy at equillibrium is 0 and this leads to the equation -deltaH=TdeltaS. My questions here is that if a reaction is at equillibrium, how can there be any change in enthalpy or entropy at all? Why wouldn't these terms be 0?

I was going through the chapter Chemical Bonding in one of the books and found something about orbital dipole due to lone pairs. In each diagram the orbital dipole due to lone pair was directed from the central atom to the end of the hybridized orbital (lone pair). Why is that so?

Hi There, I am trying to understand if I have a vacuum in the below scenario or simply just really low pressure. A pump supplies a pipe with a constant supply of water at one end (Point A) the water discharges several kilometers away at some lower elevation (Point B). At "Point A" a valve...

If I'm given the dissociation constant for HF, how would I find the dissociation constant for F-? Thanks in advance.

Homework Statement How much 4.00M of HCl is required to make 100ml of 0.400M HCl? Homework Equations M1V1 = M2V2 The Attempt at a Solution Its (4.00M)*(xL) = (0.400M)(0.100L) I think its 0.005L but the possible answer (multiple choice) say otherwise...

Homework Statement All of the lanthanide metals (La through Lu) react with HCL to form compounds having eithe the formula MCl2, MCl3, MCl4, (where M represents the metallic element). Each metal forms a single compound. A chemist has a 0.250g sample of a lanthanide metal, and she wishes to...

To everyone reading this, hello. I'm obviously new but bursting with interest in nuclear plant design. I already have six years of experience in Naval nuclear power plant operation and maintenance, so if anyone can clue me into the wider world, I would be eternally grateful.

So, I really want to be an Aerospace Engineer, but I also love chemistry, physics, math, and etcetera. Most of what I love tends to be application focused, rather than pure. Regarding chemistry, I really like synthetic physical organic stuff; especially geometrically strained compounds and...

Can someone recommend a good chemistry overview/ review? Some pdf document perhaps, not more than 200 pages or so. Notes that do not assume you are complete beginner, but you have a science (physics) background. That gives brief summaries and the highlights of all the topics that are dealt with...

Hi everyone! In just about a month, I will be starting my IB courses in junior year high school. I have chosen Math SL, along with Economics Hl, Biology HL and Chemistry HL. However in the past few days I suddenly realized how I also really like physics (especially quantum mechanics and natural...

I've verified that there is no obvious reaction between hydrochloric acid and simple alkanes (roughly C4-C12) over short timescales; they simply settle out with the heavier HCl on the bottom and the lighter hydrocarbons on the top, with no apparent heating or changes in general properties (as...

Hello, I am currently a materials science major going into my junior year. I recently gained interest in medical school (specifically anesthesiology and radiology) However, I do not know if this is going to be the plan yet for me. I am thinking about changing my major to chemistry, so that I...

With so many advances in technology and science, I find it difficult to believe that no one has cracked the code on non-flammable 'fireworks'-- something that still gives us the same bang for our buck without the ash and firestarters falling back to the earth. So, here's a challenge: Present an...

Question: So I hold a Bachelor's degree in Chemistry and have just started a M.S./Ph.D. track in Chemical Engineering. My dream job is in mineral processing (the biggest dream is with an asteroid mining company), but I understand that the school I'm going to is heavily focused on drug discovery...

Homework Statement Felder & Rousseau 4.73 (p. 184) A mixture of propane and butane is burned with pure oxygen. The combustion products contain 47.4 mole % H2O. After all of the water is removed from the products, the residual gas contains 69.4 mole% CO2 and the balance is O2. What is the mole...