Reactions Definition and 650 Threads

Homework Statement What concepts from Thermodynamics govern whether reactions occur or not? Homework Equations The Attempt at a Solution Activation energy-need some source of energy to start it-like pressure or light. Entropy-but why? Anything else, I'm sure there is more...

can degree of freedom and phase rule be applied to organic reactions,is it possible to degree of freedom above 3?

Hi there, I have some trouble understanding redox reactions. Here is the question: Sulphuric acid is one of the strongest inorganic acides which in some reaction shows oxidation properties. In which of reactions below, sulphuric acid acts as oxidating tool? A. \text{H}_2{SO}_4 +...

Homework Statement Our teacher gave us a bunch of problems, and this is one of the ones I am having problems with. What are the values of a syste that contains .450 M HCN and .230 KCN Homework Equations Ka = 4.9 x 10^-10 The Attempt at a Solution Well I tried a few different...

(1)How does the nuclear reaction in a power plant differ, from the the one that occurs in a nuclear bomb? (2)I understand how the bomb works, and how a nuclear power plant works. What I don't understand is: how do Uranium fuel rods boil water in a power plant? Do they actually detonate a sort...

Homework Statement There are three different reactions we did in class. B-: 6C14 --> 7N14 + e- B+: 6C11 --> 5B11 + e+ Nuclear rxn: alpha particle + 7N14 --> 8O17 + e+ Homework Equations Q tot = (mass inital - mass final) * 931.5 MeV Charge balance The Attempt at a Solution In...

Homework Statement Complete the following nuclear reactions, assuming that the unknown quantity signified by a question mark is a single entry. Use the following table for your answers: 0 = gamma, 1 = p, 2 = alpha , 3 = n. (a) 20X43(alpha,?)21X46 (b) 4X9(?,n)6X12 Homework Equations...

Why do some chemical reactions release energy, while other chemical reactions absorb energy?

Hi guys, Standard Model Is this reaction allowed or not? If yes, how do we represent this on Feynman diagram? (electron) + (photon) ------> (muon negative) + (electron) + positron What about this reaction? (muon neutrino) + (electron antinetrino) -----> (muon negative) +...

What reactions with easily obtainable reactants produce large amounts of harmless gas? We want to make latex or rubber balloons that inflate by themselves. We would also like to reduce the amount of liquid or solid products left in the balloon, if possible. Thanks!

A question about "opposite and equal reactions" Newton's third law of motion says "For every action there is an opposite and equal reaction". So when I throw a rock at a brick wall (action), that rock bounces off that wall (opposite and equal reaction). But if I jump up and while in the air...

I went for my 2nd ever blood donation today. Last time I managed to only give 1/4 of what was expected, apparently my (right) arm was tensed too much and wouldn't allow blood to flow freely. This time we went to try the left arm. Well, the guy that inserted the needle did a poor job of it and...

Hello! Quick question, but it's really bugging me! Exergonic reactions often yield polar molecules as the products (e.g. combustion of methane). Are these polar molecules 'favourable' because the electrons are spending more time in a lower energy region; or is this wrong, and there's a...

This is a stupid question, but it has always been a question of mine that I have never been able to find a strait answer. To be more specific, is quantum electrodynamics or special relativity used to model or predict fission reactions such as those found in a nuclear explosion or inside a...

Does anyone know of a clean proof that a reaction will occur at constant temperature if the change in Helmholtz free energy is negative, or at constant temperature and pressure if the change in Gibbs free energy is negative? The only `proofs' I've found rely on the fact that the entropy...

Homework Statement Fixed end beam with Length = 1m Load 1 = 58.86n @ 0.4m from A Load 2 = 39.24n @ 0.85m from A Find Ma, Mb, Ra, Rb Homework Equations Not Sure, where help is needed The Attempt at a Solution Well i think, almost sure from 2 methods that Ra = 40.52511...

Homework Statement An acid and a base is supposed to form a salt and water during a neutralization reaction such as NaOH + HCl --> NaCl + H2O. However, based on Brønsted–Lowry acid-base theory, shouldn't NaOH become NaH2O or something like that after accepting an H+ ion from HCl since the base...

can anyone tell me what are the enzymatic reactions that use ATP an energy source ?

Im not sure if I am understanding this correctly, when atoms in a molecule break apart is it the energy that was previously contained within the bond holding the atoms together that is released causing heat? and when creating a molecule out of atoms, does it require energy in order to use to...

Hi. I've been given this to calculate the support reactions but I'm not sure how to handle the increasing udl. And how would this be shown on a Bending moment and shear force diagram?? Also with non increasing Udl's when calculating the reaction is it best to change the udl to one force...

Homework Statement Write the balanced molecular equation, complete ionic, and net ionic equation for each of the following: I'm pretty sure I'm doing these correctly, but I just wanted to make sure: a) -- molecular equation b) -- complete ionic equation c) -- net ionic equation 1)...

Tension = 386lb Bx = 493lb By = 186lb I am having trouble trying to determine the tension in the picture. And the x and y component of B i have a long bar that is 14 feet long. it is connected at 1 end at point B to a pin support and the other end is tied to a rope at point a.point a the rope...

Homework Statement For each of the following situations, identify those for which a reaction is liely to occur. For those that do occur, write a net ionic equation a) Chromium dipped into silver nitrate. b) B) Gold immersed in hydrochloric acid. c) Nickel pellets dropped into calcium...

What would the centripetal and/or centrifual force be, on an object that was traveling in a 10mi circle at 18,000 mi/hr? OR how heavy would a person feel riding in a train traveling on the inside of a 10 mi round tube at 18,000 mi/hr?

Homework Statement http://members.shaw.ca/code/statics.bmp Homework Equations The Attempt at a Solution I'm having a tough time getting started with this one. Obviously W= 196.2N and AD = 0.425m Do I need to do a force-couple system? Thanks much! Steven

If you have a beam with 4 reaction forces, how do you calculate the load taken by each reaction? It occurs to me that you cannot simply take moments about one point so what is the method you can use to find the reactions? I made one example where the beam was symmetrical so I tried equating it...

Homework Statement Determine the SUPPORT REACTIONS acting on the frame http://i34.tinypic.com/j94hoo.jpg" You can see I have drawn the FBD, but I am lost on applying static equilibrium about point "F" because I don't know the distance from point "F" to any other point. In order for me to...

Homework Statement Determine the SUPPORT REACTIONS acting on the frame (See Picture Below) You can see I have drawn the FBD, but I am lost on applying static equilibrium about point "F" because I don't know the distance from point "F" to any other point. In order for me to sum the moment...

Hello! I was wondering how I could make a pressure chamber to aid some chemical reactions? The higher the pressure I'd be able to put into the better, although I am not really concerned as I don't particually have anything in mind. I'd probably like to be able to heat it up a bit - if the...

During a nuclear reaction, some energy (or heat) radiate away, I understand that means some mass (or substance) get away. What left over is lighter. Does this mean some basic particle disappeared? for example there are less number of neutrons after the reaction? or the number of particles are...

Homework Statement Styrene is a Hydrocarbon. If 0.438g of Styrene is burned in Oxygen and produces 1.481g of CO2 and 0.303g of H20, what is the empirical formula of styrene? Homework Equations The Attempt at a Solution No. of moles of CO2 - 1.481g / 44.0107g/mol = 0.0337mol No...

chemical reactions with hydrochloric acid does p-toluidine hydrochloride dissolve in HCl?? When it combines with HCl, what would it produce?

Which of the following macromolecules are held together by covalent bonds between monomers and are synthesized through condensation reactions? Choose all correct answers. Nucleic acids Triglycerides Carbohydrates Proteins This is what I think: -Nucleic acids form...

A column AB is anchored to the ground by a pin-joint at A, and is held in a vertical position by various loads as shown. Determine: (i) Magnitude of force f1 (ii) Magnitude and direction of the reaction at A I know how to calculate F1 if it was on a horizontal or vertical. But I'm not sure...

I have to calculate the vertical reactions at point A and C. I know that the sum of all vertical forces is equal to zero but i can't solve the equation since there's two variables. http://users.on.net/~rohanlal/Q3.jpg Bv=50 Cv=55 Dv=45 w=80

We have been asked the following: "For fixed compositions, show that T = (partial U/partial S)_V = (partial H/partial S)_P". There are 7 other equations after this one, but I think once I know how to solve the first one I will be ok with the rest. We have not been provided with any relevant...

Hii.. Can anyone tel me... some Exothermic Liquid reactions to carry out experiments for my project work...

http://en.wikipedia.org/wiki/Cosmic_ray I have a little bit of trouble writing an essay that relies on background knowledge of galactic cosmic rays. I found in textbooks solid writing about the history of discovery and composition, etc. I can not find simple exemplary nuclear reactions...

Does mass of compounds change due to exothermic/endothermic chemical reactions?

Homework Statement this question is contained within the equilibruim area of study. in a practical activity, we were supposed to 1/3 fill a vessel with iodine, and then add NaOH(aq) - when this was done, the yellowy colour of the iodine completely diappeared. we then added the same...

I realize that to calculate heat being released and contained during nuclear reaction you must understand the difference between its product mass and reactant mass by using *E=mc2.* My Question pertains to the heat being released during a chemical reaction... Is Mass conserved in this chemical...

Fusion reaction is not possible at room temperature because: 1) nuclei only moves at high temperatures 2) nuclei move too slowly at room temp I'm not sure about this. but i think that 2 is right. Can someone verify this? Another question that I am also wondering is that when...

I'm having trouble getting my head around how to determine the direction of the forces of reaction and of moment/torque in static equilibrium systems. For example how do I determine the reactions for the system attachment and why are they as they are.

Redox reactions can take place in both acid or basic solutions, that I know. But, what if the type of solution in which the reaction occurs is not given? Am I to assume it is acid or basic?

Homework Statement A 4000lb uniformly weighted crate is attached by light inextensible cables to the trus show below. Simply determine the reaction at A and E of the truss show below Figure 1 attachment Homework Equations I used the Moment arm equation of M = F*Distance The Attempt...

This law is confusing me. If everything needs an equal and opposite reaction how do things move? Surely everything should be stationary if this law is true?

Homework Statement What is the molarity of a NaCl solution if 18.3mL of the solution reacted with 13.6mL of 0.1M KMnO4 based on the following unbalanced redox reaction in an acidic solution? Cl- + MnO4- yields-> Cl2 + Mn2+ The Attempt at a Solution I did the two half reactions...

Homework Statement Is it the same to say the products are favour and the forward reaction is favoured. Or can the reverse reaction be favoured but the products be favoured. For example, the equilibrium constant is >1 so by definition the products are favoured, but if a system has excess...

Products of this reactions?!? 1.I can't seem to get an equation for this reaction.Potassium Biphthlate + Sodium Hydroxide gives me what? Both are dissolved in water. Need to figure out the equation to standardize the sodium hydroxide. NaOH + KHC8H4O4 -->All are aqueous.

Homework Statement State whether the following reactions or particle decays are allowed or not. • What conservation laws, invariance principles, or other mechanisms account for the forbidding of some processes? • Try to draw the Feynman graph of some processes...