Reactions Definition and 625 Threads

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...

[FONT="Book Antiqua"] 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...

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- + MnO[SIZE="2"]4- yields-> Cl[SIZE="2"]2 + Mn2+ The Attempt at a Solution I did the...

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 + KHC[SIZE="1"]8H[SIZE="1"]4O[SIZE="1"]4 -->All are...

I read many years ago that muons captured by nuclei with Z>10 react with these nuclei faster than their simple decay. In other words, such reactions as muon + Fe-56 --> Mn-56 + muon-neutrino are faster than the simple decay of the muon to electron, muon-neutrino and electron-antineutrino. I...

Aspirin, C9 H8 O4 (molar mass 180.2g/mol), a drug used to relieve minor aches and pains, is prepared by the following reaction: C7 H6 O3 (s) + C4 H6 O3 (l) --> C9 H8 O4 (s) + C2 H4 O2 (l) If you need to prepare 45.0g of aspirin, and yield for the reaction is 85% how many grams of salicylic...

calculate the amount of energy released in the fission of a U-235 nucleus. http://www.dummies.com/WileyCDA/DummiesArticle/Nuclear-Fission-Basics.id-1669.html Given: Masses of the particles: U-235 = 234.9993u n=1.008 Ba=140.883u Kr=91.905u what i did was i used delta E=mc^2, where m is...

Homework Statement CH3CH2-Br + (CH3)3C-O¯+K ----> (CH3)3C-O-CH2CH3 ethylbromide + potassium t-butoxide ---> ethyl t-butyl either can someone please tell me why this is a Sn2 reaction? Homework Equations The Attempt at a Solution I figured it should be Sn1 because the...

Fission is a process in which a nucleus splits into two parts that are roughly the same size of the original nucleus. Tn fusion, two nuclei fuse, or combine, to form one nucleus. These reactions seem to be opposite to each other and yet both release large amounts of energy. Explain why this is...

hi i have the following reaction isobutyric acid + 2-methoxyethanol <-> 2-methoxyethyl-2-methylpropanoate but i don't know all of the by-products. please help thanks edit: i think is only water and some unreacted reactants?

Homework Statement I don't understand this problem, i think he wants me to find the limeted reaction. If you could explain as good as possible. Thanks :smile:Homework Equations Al(OH)3(s) + H2SO4(l) → Al2(SO4)3(aq) + H2O(l) If 1.28 g of aluminum hydroxide reacts with 3.73 g of sulfuric acid...

Homework Statement Why is the acid based catalysed reaction of esters first order while the akaline based catalysed reaction is second order. Homework Equations rate is proportional to [ester]^a [water]^b The Attempt at a Solution i know that a fisrt order is proportional to...

Could someone please explain to me why uds->uud+danti-up is an allowed reaction even though individual quark number conservations are violated?

I would be interested in knowledgeable comments on this work, and whether you find it amusing: http://www.lit.org/view/41030

1. hi i would like to now how i could do this? the question says: iodine-131 is a radiactive element used in the medical diagnosis and treatment of thyroid problems. iodine-131 undergoes simultaneous beta and gamma decay and has a half-life of 8.00 days. 2.im ask to write the complete...

A simple question really. Does acceleration affect the rate of a chemicall reaction. I.e if I was to put some test (chemical) experiment aboard a suitable craft and accelerate it to a high velocity, would the reaction occur at the same rate as it would at rest - ignoring relativistic effects...

Homework Statement a - How many fission reactions would occur in 1 year of running of a nuclear reactor if the average power of the reactor is 778 MW? b - How many kilograms of U-235 would be needed to run the reactor for 1 year? c - What is the total change in mass for 1 year of running...

Homework Statement http://avogadro.chem.iastate.edu/CHEM332/332Fall06Exam5Key.pdf Please go to page 5. Homework Equations No equations, just concepts. The Attempt at a Solution I tried the first problem (A), and got the solution wrong. I thought I'd check the concepts before attempting any...

I would really just like to know if I'm on the right track here in terms of if reactions can go ahead or not... The reactions are in latex and my thoughts are below each one.. Homework Statement For each of the following processes say whether it is a strong, electromagnetic or weak process or...

Is there an ultimate rule that can tell you what to check for to see if a reaction is allowed? I'm quite confused about what to check for in each situation? Is lepton number always conserved? How do you know whether there's enough energy to produce a given mass (eg e+e- -> tau+tau- isn't allowed...

hi guys, iam kinda stuck on 2 problems. here is what it is : The nuclear fission reaction of uranium-235 with one neutron produces germanium-81, 5 neutrons and another element, what element is that? what's the atomic number andatmoic mass,?give the equation. 2. how much energy is...

I'm trying to find out what type of reaction this is. a drop of water is added to a small pile of chemicals in a dish, after a few seconds, a blue flame and smoke is produced. NH4NO3 reacts to form (with chlorine as catalyst) N2O and water the experiment is called oxidation of zinc, so...

[SOLVED] Chem Lab Help! My AP chem class did an experiment where we started with 0.500 grams of copper and we ended up with 0.525 grams of copper after the experiment. The experiment consisted of us sending copper through different reactions to observe the effects of a series of reactions on...