Chemical Definition and 1000 Threads

i've got thoughts about a series of chemical reactions that would simply keep on repeating. perhaps by time release. the thought is to use this perpetual chemical reaction to create a battery that releases the electrons then has a series of chemical reactions eventually resulting in the two...

I really enjoy chemistry and maths and am considering chemical engineering in uni. I am not sure whether to do chemical engineering degree straight up or chemical engineering/commerce double degree. What are advantages and disadvantages?

I have been advised that the questions that I ask in another thread in the Chemistry Forum may be better assessed by those who frequent the General Physics Forum. I would be much obliged if you could take a look at the following link, and provide any thoughts, feedback, ideas that you may...

If this is the wrong place for these sorts of musings, I greatly apologize and I would be profoundly obliged if someone could point me in the right direction. Otherwise, on with the question. I have repeatedly heard it said that the number of chemical species and, by extension, the...

Homework Statement I was wondering why bonds are more stable at cooler temperatures than at higher temperatures. This question came from a research project about annealing (heating then colling) plastics and why polyethylene maintains its shape when it's cooled.

I want to know why there are cis- and trans form of 1,3dibromo-1,3-dimethylcyclobutane? and anybody explain it to me thanks a lot

So the University of Queensland offers an optional first year general engineering program; at which point you choose a specialization. Alternatively, I think I can just jump straight into Chemical Engineering, which I'm pretty sure is the one i want. I can't know for sure until i get some...

Hey there, I am currently a second year chemical engineering student, and was wondering for those of you who are chemical engineers or have studied chemical engineering, what do you currently do? It seems like a very interesting field, and I have been doing quite well in my classes, but I...

I am really starting to doubt myself, which sucks because it's what I want to do. Should I retake? Can I move on and be ok? (I did fine in the integrating part, but not so much in series/sequences)

Alright so I know the common answer: Enantiomers - same chemical and physical properties Diastereomers - different chemical and physical properties In lecture, our professor said that enantiomers can have different biological effects. I was confused because, as he had said earlier, they have...

When one atom chemically combines to another atom is it totally determinate? I mean if one atom gradually approaches the other would the reaction occur at exactly the same place or does HUP play a part and give it some randomness? I think there is a known answer to this but I cannot find it...

I don't know where the 1/2 comes from in the third image. If I set mu total(up) = mu total up (0), I don't get the 1/2. I'm missing something very simple here. http://i111.photobucket.com/albums/n149/camarolt4z28/IMG_20110325_214532.jpg?t=1301107797...

hi, How can I show that the chemical potential of an ideal gas µ(T,V ) can be given by: \mu(T , V , N )=k_{b}T\left(a+1+ln(\frac{Nv_{0}}{V})\right)

Right now I am in chemical engineering, as a freshman, and am taking my first ChE course which involves material and energy balances. I am right now, on my spring break, still trying to understand the topics because its just not coming to me. I am working problem after problem and I usually keep...

Right now I am in chemical engineering, as a freshman, and am taking my first ChE course which involves material and energy balances. I am right now, on my spring break, still trying to understand the topics because its just not coming to me. I am working problem after problem and I usually keep...

Warning: I'm not a practicing chemist. Answers in as-simple-as-possible language (but not oversimplified!) would be greatly appreciated! I'd like to know if the chemical properties of a solid can be affected by conduction band electrons. I assume that, in the majority of cases (and perhaps...

i would like to know if there any Method/way to Balance chemical equations? for example if i got this equation: P2S5+PCl5--->PSCl3 i know how to Balance but is take me a lot time to find the correct factor for Each Molecule. hope you Understand what i mean.:smile: thanks.

Homework Statement Please help me in chemical equations of redox reactions. Here are the problems. 1. Mixing potassium dichromate, K2Cr2O7, and sulfuric acid, H2SO4, in a test tube. Then, add hydrogen peroxide, H2O2, drop by drop, shaking the solution after every drop. Add until a change...

Hi there people. CUrrently I am in a dilemma. I am applying for a undergraduate program from an institution in my country and they are currently offering me 2 different chemical engineering degrees from 2 different universities which are: 1.)Newcastle University (UK) 2.)Technical University...

Homework Statement Ammonia NH3 is made by the haber process: N2 + 3H2 --> 2NH3 The nitrogen required for this process is obtained from air by using the air to burn natural gas CH4 , thereby removing the oxygen from the air, leaving behind only nitrogen. The hydrogen required is obtained...

In my textbook there is an example with the following reaction and rate: C6H6 + 3H2 -> C6H12 Rf = kf[C6H6][H2] Then the the example claims that the ratio of the rate constants is: kf / kr = [C6H12] / ( [H2]3 [C6H6] ) How is the denominator of that ratio possible if the forward...

Hey guys, I have a question regarding the process by which a reaction returns to equilibrium. If a reaction's reaction quotient is greater than its equilibrium constant, it will shift towards the reactants side of the equation to return to equilibrium. How exactly does this happen? Does...

In normal chemical cells, the electrodes are two different metals so that the more reactive one gives off electrons and create a flow of electrons and hence electricity. [the electrolyte is say NaOH aq or whatever] Just wondering - is it possible to have a chemical cell consisting of: a)...

I am looking at this equilibrium: H2O + D2O <-> 2DHO (D = Deuterium) I have 2.0 mol of H2O, 1.0 mol of D2O and 2.0 mol of DHO. What are the equilibrium amounts of each of the molecules? What I tried: 6 mol of H, 4 mol of D H2O: P(X=H) & P(Y=H) = 9/25 D2O: P(X=D) & P(Y=D) = 4/25 HDO...

Hi All, I'm currently deciding on what to major in - my top 2 choices are chemical and petroleum engineering. I slightly favor petroleum engineering, but I am not sure whether it would be a good idea to go into it at this stage since I am uncertain about the future of the oil industry. I...

While useful and unique for reactions or phase transforms, I fail to see how chemical potential brings anything new to ideal gas systems. For example, if chemical potential is described as the quantity the same for 2 systems in diffusive equilibrium, then for ideal gas systems (think 2 boxes...

Hi all, I have decided to do a second degree since my first degree (math) hasn't given me many options for work or graduate study that I'm interested in pursuing. I am strongly considering chemical engineering, since I am enjoying my chemistry course so far and have the strength in math to...

We do know that in the process of chemical reaction, atoms or molecules come closer, form bonds and get stabilized by sharing or donating electrons, thus filling the valance shell of atoms. But why do they want to get stabilized?.

Why when a chemical species is stablized by resonance, its energy level is lower? As I know, resonance is only a kind of electrons delocalization within the species. There is no interaction between that species and the environment.

Homework Statement If limestone (calcium carbonate) and clay (assume aluminum silicate) are mixed together and heated then the result is cement. Cement is a mixture of calcium oxide, carbon dioxide, aluminum oxide, and calcium silicate. These bags can be purchased at any building supplies...

What is the maximum size scale (how many atoms) where the concept of wave function is still useful in chemistry esp. biochemistry? For example. Wave function modelling is easily done in Hydrogen Atom. The interaction Hamiltonian is mostly of the nature E = K + P (Total Energy = Kinetic +...

Homework Statement If Q = 1.0 1042 for the reaction C(s) + O2(g) → CO2(g) at 25°C, calculate Keq. dGof (Kj/mol) of... C(s)=0 O2(g)=0 CO2(g)=-394.36 Homework Equations dGorxn = -R*T*ln(K)The Attempt at a Solution -394.36*1000 = -8.314472(298)ln(K) K=1.3e69 This is the wrong answer. I'm...

lets say there is a pond of 1,000,000 gallons of water. and the total of 10,000g of chemical is evenly dissolved in the water Fresh water starts pouring into the pond at the rate of 300 gallons/hour and the pond also releases water at the rate of 300 gallons/hour (hence no change in total...

Hi everyone, I have been given an assignment with my physics subject and describe in 400 words how electromagnetism can be used to determine the composition of different chemical mixtures I was hoping someone could lead me to a couple of websites to do my research. I have entered about...

Hi there, I was just wondering about this point, why do some chemical reactions produce bright light (and even sound) whilst others do not? For example: in the rapid oxidation of Magnesium in air after given the necessary activation energy, a bright white light is emitted. However, in many...

Homework Statement Consider a first order decomposition reaction 2P(g) -----> 4Q(g) + R(g) + S(l) taking place at a temperature T. After 30 minutes from the start of the decomposition in a closed vessel, the total pressure developed is found to be 317 mmHg and after a long time, the...

like this: 1)H2SO4 + Al(OH)3 --> Al2(SO4)3 + H2O 2)Pb2+ + Cl- --> PbCl2 and word equation like this ethane(C2H6) + Oxygen --> Carbon dioxide + Water vapour Thq.

Hi, This may sound like a weird question. I have extremely painful burning sensation on my lower buttocks and down the back of my upper leg. I have been to the doctor and he has no answers. Is it possible that I came in contact with some substance that could cause the extreme burning, but...

The more reactive an element, the stronger bonds it forms, because the same energy must be put into that bond to separate them that was put out due to the reaction. Most of the elements we are made of, in pure form, are reactive correct? Carbon and oxygen have very high electronegativities, and...

hi, what is the chemical potential of N2, CO, or NH3 molecules in a gas phase? How to determine it? Thanks.

In other words, the whole point of the reaction is not to stabilize? And then, how does entropy have anything to do with a reaction?

Homework Statement If limestone (calcium carbonate) and clay (assume aluminum silicate) are mixed together and heated then the result is cement. Cement is a mixture of calcium oxide, carbon dioxide, aluminum oxide, and calcium silicate. These bags can be purchased at any building supplies...

I am a mechanical engineer who is writing a science fiction novel where a means has been discovered to temporarily reduce the mass of the nucleus of certain 56Fe atoms. When a certain field is applied to the iron, it gets lighter. When the field is removed, the iron regains its original mass...

Okay, so I just got done with my fall term classes, and my grades aren't the best. I was wondering two things, one, should I continue? Everyone seems to give me the easy "of course you can do it" spiel, while that is good and dandy, it never tells me anything. I don't know if I really can do it...

Hello. I am currently a physics major attending a university where there is no true engineering degree. I was wondering if one who is pursuing a degree in physics would even have a chance of getting into a program involved with chemical engineering. To me, it seems the further along, physics and...

Is it true that chemical engineers make more money than any other type of engineer?

cabbage chemical composition? Does anyone know what the chemical composition of cabbage is? I've looked all over the internet and can't find ANY information on this.

I plan to take Engineering as a second degree since I haven't had much luck with my BSc. I'm considering Biomedical (somewhat high paid but jobs are seem to be rare), Chemical (twice as many employed and slightly higher pay) or Mechanical Engineering (highest number employed by a long shot). I...

Homework Statement 12.8 gr of O Flowed over 100 gr hot Al. and i got this reactions equation: 4Al(s)+3O2(g)--->2Al2O3(g) a)how many gr Aluminum oxide Al203 Created through a chemical process ? i know i need to find the number of moles of oxygen which flowed. and the number of...

Hey guys, I am from a Canadian university and have just recently took the GRE (1480 for verbal+quant). I am thinking of applying for graduate studies in the United States, preferably tier 1 schools such as Princeton, MIT etc.. However, after doing some online research it seems that schools...