Chemical Definition and 1000 Threads

Dear all, I recently completed a M.S. in Chemical Engineering and I am finding that I lost my drive. I am instead more passionate about Informatics. I opted for trying to learn things on my own because I did not want to take on debt to pay for college. It worked out considerably well. I learned...

What should be the molarity in an aquatic dissolution for Trimethylamine, ##(CH_3)_3N## if ##pH=11,2##? ##(CH_3)_3N+H_2O \rightleftharpoons (CH_3)_3NH^++OH^-##, ##K_b=6.3 \times 10^{-5}## I know that ##pH+pOH=14 \rightarrow pOH=2.8##, then ##[OH^-]=1.58 \times 10^{-3}## And...

Determining the atomic number, mass number, and chemical name during beta decay! Homework Statement The image below shows the element Thorium with the atomic number listed above and a mass number of 233. This element undergoes two successive beta decays. The resulting nucleus will have an...

Homework Statement Compound A can react to form B and C according to the following A<->2B Kc=1 A<->C Kc=1 If 1 mole of A is solved into 1 litre of water, what will the concentration of A be after equilibrium has been reached?Homework Equations ICE-tables(?) A<->2B+C Kc=([B]^2[C])/[A] The...

[1] Good afternoon anyone! I am a Petroleum Engineering student at Palawan State University and conducting a research. I have seen a topic of research, and it is: The Production of Petrol from Air and Electricity, and I need to find some reaction equations for my topic, here are some: Air...

Homework Statement Basically, find the chemical potential of an ideal gas knowing its heat capacities.Homework Equations P V = n R T \ \ \ \ (1) U = n c_V T + U_0 \ \ \ \ (2) S = S_0 + n c_V ln (T) + nR ln (V) = S_0 + n c_V ln (T) + nR ln \left ( \frac{nRT}{P} \right ) \ \ \ \ (3) \mu = \left...

Homework Statement 609.5 grams of vanadium (II) oxide, VO, and 832 grams of iron(III) oxide, Fe2O3, react according to the equation, which substance(s) and how many grams of each would be in the tube after the reaction completes? 3 points Homework Equations Equation: 2 VO + 3 Fe2O3 -> 6 FeO...

Is there any free software for drawing nice neat chemical stick models? I'm just looking for simple software to make the simple stick drawings of the chemical structures. I have software for drawing "ball and stick" type drawings, i use Avogadro chemistry software. Its software for drawing...

Homework Statement The reaction is PCl5 (g) <=> PCl3 (g) + Cl2 In an unknow volume, the following mixture is balanced: 0.14 atm of PCl5 0.36 atm of PCl3 0.50 atm of Cl2 What would be the the pressure of the whole mixture if the volume would be halved? (the answer is 1.88 atm) Homework...

For those of you who have experience with these programs, I have some questions. How competitive are they generally? They don't seem like they get a lot of applicants. Is it a bad idea to ONLY apply to chemical physics programs as a chemistry major? There are 5 schools I know of with chemical...

Hello, Given that our body is 18-26% efficient in converting chemical energy into mechanical, does that mean that 74-82% of what I consume is not burned? Furthermore, assuming a certain task requires 1000 KJ, how many meals 2000 KJ each will I need to consume for completing it without gaining...

If someone could check my work on this, I'd appreciate it: Thanks!

I have a very hard time cleaning out the hard water stain and soap scum on the shower door glass. I tried the normal cleaning spray. I tried using Vinegar( acetic acid), Lime juice (citric acid) with no luck at all. Any suggestion on what I can try?

Homework Statement I am working Problem 5.29 *** (b) in Griffiths QM. We are asked to show that m(T) monotonically increases as T decreases, assuming N and V are constants. m(T) - is chemical potential. Homework Equations Too many to list, probably easier to look in the book if you...

Does heat weaken the strength of chemical bonds?

My textbook (Burdge, Chemistry, 2nd edition) is pretty vague mathematically when it comes to calculating the examples, so I'm a bit confused about solving this example problem. The equation is fairly straightforward: ln{[A]_{t}/[A]_{0}}=-kt The 14.4 problem statement is (paraphrased)...

I know that in undergrad (at least in my school), mechanical engineers usually have their projects on things like robots, cars, UAV, trebuchets, etc. Electrical engineers usually build clocks, calculators, data encrypters, wireless systems, ALU, motors, generators, lamps etc. Civil engineers...

I was writing personal statement for chemical engineering and I was thinking of a good reason for my choice. I can't come up with anything other than the fact that I really enjoy Physics, Chemistry and Maths. I really want to do chemical engineering and I want to make sure that I get in this...

Hi all, I'm looking for the energy required for a 2-step chemical reaction: CaSO4 + S2 -> CaS + 2SO2 CaS + 3CaSO4 -> 4CaO + 4SO2 This reaction is to happen around 1600 deg. F. I solved for the heat of reaction for these two reactions with the following enthalpy equation: H2=H1+∫CpdT I...

Hi everybody... I've been working a bit with models of chemical oscillators and I've run into something that isn't quite clear to me. Chemical reaction systems are typically regarded as having the Markov property -- they lack memory and their evolution depends only on their current state...

Homework Statement The mean life of a certain radioactive element is 6 hrs. By what fraction will its initial activity decrease over a time period of 5 hrs. Homework Equations t_{avg}=\frac{1}{k} Initial Activity = kN_{0} Final Activity = kN_{t} The Attempt at a Solution From eqn 1...

So I've well into my first year at university, but I have been having doubts about my degree already.. It seems like I never thought about what I REALLY wanted to do during high school. So due to me enjoying a mix of physics, chemistry and math, I chose ChemE.. However, I've always been...

The rule that if the pH of solution is below the pKa of a molecule then that molecule will be protonated is a handy rule. However, I'm finding it difficult to find the pKa of the chemicals I'm working with. This mostly applies to looking at nitrogens in organic compounds. For example, it is...

Basically. I'm a sophomore at Stony Brook University and I was doing biomed but now I think I want to be a software engineer so, I'm trying to get into the Computer Engineering program at my school. I did research and I learned that software developers/software engineers are growing in demand...

Homework Statement I need to find a specific chemical for a lab class. The manual states the chemical must: Be used as a drug in the pharmaceutical industry Have one chiral center Be soluble (make 4 Molar solutions) in water So...any ideas? Or, better yet, is there a database where I...

Hello, Can some one please help me out I am going to be starting my undergrad and i wanted to know about chemical and electrical engineering. I wanted to know the following things. 1) which of these two is more in demand? 2) which of these two is easier? 3) in which engineering will i get a...

Homework Statement So the question says for the reaction 2N2O5(g) --> 4NO2 (g) + O2(g) provides a linear plot when P(N205) is plotted against t with a negative slope . The decomposition of N2O5 follows ? Homework Equations The Attempt at a Solution I am guessing that P(N205) is...

Is there a chemical that can absorb oxygen and nitrogen and in solid form. I need to make a vacuum in a pvc pipe or close to a vacuum. I was wondering if there were some chemicals that I could insert into the pipe and then close the end and tip it over and mix the chemicals together that...

How much overlap is there between physical chemistry and chemical engineering with regards to thermodynamics, kinetics, and transport phenomena? Would it be beneficial for a chemical engineering student to take the physical chemistry courses that deal with these topics? Or would it be redundant...

The correct answer states its C which i understand why since doubling the intiial volume of SO2 is equivilent to doubling the intial moles of SO2 hence the moles of SO3 produced will also increase and hence pressure exerted shld be higher than before which is not reflected by the graph...

The problems are Number 12 and 13 on this link http://isites.harvard.edu/fs/docs/icb.topic1096438.files/PS4.pdf I have the value of k for sum number 12, it is 1.54*10^-4. Im completely stuck with number 13 cos I'm unfamiliar with that concept and it kinda went over my head in lecture...

I have been accepted into a chemical physics PhD program with a concentration in optoelectronics, but now I'm considering geophysics as a more preferable major. However, I've already said I would attend and there doesn't seem to be enough time to apply to a different school. Furthermore...

Why does the effectiveness of a car battery seem to drop off rather sharply when the voltage gets a bit below 12? I would think it would be more or less a linear decay of current ( I = V/R etc). Thus one would think that the current generated would be proportional to the voltage but anyone...

For the reaction, 2SO2(g) +O2 (g) ->2SO3. Why is it wrong to say that the reaction must involve a collision between one O2 and two SO2 molecules? Don't they form S2O6, which is equivalent to the product, 2SO3? What should I say then, about the reactants in forming 2SO3? Thank you so much!

I am studying the activation energy of a reaction, and I notice that it says when the products are more stable than the reactants the reaction is exothermic, and endothermic when the products are less stable than the reactants. It doesn't say why, but my supposition is that when the products...

Chemical engineering with a physics degree? I'm currently in college and have decided to major in physics with a minor in chemistry. Can this type of bachelor's degree get me a job as a chemical engineer? Before anyone asks, I don't want to get a degree in chemical engineering because I might...

What is the chemical formula for car exhaust emission

Hello, I am studying Chemical Engineering at the University of Oklahoma. I have recently become very interested in Nuclear Engineering, but unfortunately my school does not offer the degree. Is it possible to go from a Chem E b.s to a Nuclear Masters? Thanks!

I'm starting college as a freshman in september, double majoring in chemical engineering and physics. It is one of the best engineering schools in the US, and I was accepted into the honors program. Physics is sort of a hobby for me. I just added it as a major because it wouldn't be difficult...

Title says it all. I've been wondering. The argument is, is there a minimal temperature required for any chemical reaction to reach its activation threshold? Or would the energylessness of the atoms prevent bonds from forming (or dissolving, I guess)? Conrad.

Does anyone know what compounds make up the resin used by resin type 3D printers? I need to know if it could possible react with some hexane, toluene, and other chemical solutions for sure, though I believe the resin to be fairly inert chemically. Thanks PF.

The title is self explanatory. Thank you

Since it is impossible to get certain cleaning solutions (in Canada, at least) like "Eclipse" (methanol) and pure isopropyl alcohol (from drug stores) is adulterated with some kind of greasy oils that leave smear marks behind, I would appreciate some help as to what chemical solutions might be...

The question in the attachment is from an old entrance exam for medical school. The correct answer is B. I realize that if I assign a 'point value' to the levels of reactivity for each of the letters i.e. the more reactive the higher the number T = 1 Q = 2 M = 3 J = 4 and that if...

Hello Pals, My fiance is going to school for chemical engineering. I have read the statistics pertaining to on-the-job fatalities and general risks associated with this career. I warn him daily that he will face substantial risk to his health resulting in, but not limited to; face splash...

hi I'm taking GCE O levels so this might give you an idea of my level of chemistry. For a reaction like 2H2O2-->2H2O+O2 and the question tells me it has an ΔH=-98kJ/mol so does it mean that when 2 moles of hydrogen peroxide decomposes to form water and oxygen, the net amount of heat generated is...

Why do we recognize a stream of sunlight going through the clouds causing a river to glitter as beautiful. Is it a chemical process? Why would we recognize something like that outside of ourselves that has no use as beautiful? And how would that fit into the theory of evolution and biology if...

My new plastic toy has a strong chemical smell, does anyone have any suggestions on how to remove this smell? Thanks in advance for any suggestions

Can we measure COD in Mol/Litres?

Do Chemical Engineers get to travel the world? Hi, just wondering if chemical engineers get to travel the world for their job? Like if you think of civil engineers, their companies will regularly contract them to do projects overseas, similar to mech and elec engineers, but for chemical...