Reaction Definition and 1000 Threads

Homework Statement This is from Introduction to High Energy Physics by Perkins, question 3.1 Show that the reaction π- + d → n + n + π0 cannot occur for pions at rest. the π's are pions, the d is a deuterium, and the n's are obviously neutrons. Homework Equations Conservation laws I started...

Homework Statement Does iodine take part in the rate determining step of reaction between propanone and iodine in acidic medium? Homework Equations The Attempt at a Solution For positive catalyst the rate determining step is the 1st step of the at least 2 steps of reactions after being...

Homework Statement Two bodies are acting on one another on an inclined surface. Assuming a constant vertical input force and the lower body being vertically fixed in place on the right hand side, what will the angle of the inclined surface affect. In essence, will the vertical component of...

How do I find reaction for loading condition shown in image. I have no idea how to tackle this type of problem. Please help. http://img6.imageshack.us/img6/725/partilaudl.jpg Uploaded with ImageShack.us

Homework Statement Given that for the reaction KOH(aq) + HCL(aq) ----> KCL(aq) + H2O(l) H = - 54kjmol^-1. What is the quantity of heat involved in the reaction? 2NaOH(aq) + H2SO4(aq) ----> Na2SO4(aq) + 2H2O(l)? Homework Equations Heat of reaction Hrn =heat content of product Hp - heat...

Homework Statement http://imgur.com/AjUdF Segments AB and BC of the beam ABC are pin connected a small distance to the right of joint B. Axial loads act at A and at the midspan of AB. A concentrated moment is applied at joint B. Find the reaction at A, B, and C. Homework Equations...

Homework Statement Solutions of cobalt(II) nitrate and sodium hydroxide are mixed. What are the solubility rules for the hydroxides? and it occurs in a aqueous solution Homework Equations I have no idea how to solve these problems from my chem class lasty year and we will be...

Hey I'm just going over a past paper and I've lost the section of my notes RE this topic. I understand how to draw the free body diagram when there is a pin involved, but not when it is connected at 4 points, the fact that they're at an angle is not helping. Any help greatly appreciated...

How does the formation of non-ionizing substance (e.g. water in neutralization) prevents the possibility of reversing the reaction? thanks

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...

For a chemical reaction we have, ΔH=-114.1kJ and ΔS=-146.4J/K ---> ΔS=-146.4·10^{-3}kJ/K. Question: Determine the temperature range at which the reaction is spontaneous. A reaction is spontaneous when ΔG is negative in the equation ΔG=ΔH-TΔS, so I do: ΔG=ΔH-TΔS 0>ΔH-TΔS -ΔH>-TΔS...

Allyl Bromide, during the addition of HBr gives CH_3-CHBr-CH_2Br CH_2Br-CH_2-CH_2Br CH_3-CH_2-CHBr_2 CH_3-CBr_2-CH_3 My take During the addition of HBr, electrophile will attack first, considering the shift of pi bond in allyl bromide as follows: BrCH_2-CH=CH_2 \longrightarrow...

Hello again forum! I'm doing a few experiments at home with a protonated saline solution and need some assistance. What is the reaction between the hydronium ion and sodium chloride. I think it's: H30(+) + NaCl => H2 + H(+) + NaOH but I'm not sure. :confused: Any advice would be great...

Hi I am working on my M.Tech project. Now i need to identify whether other than brushless dc motor and permanent magent synchronous motor , is there any other possible motor which can drive a reaction wheel in a satellite. please give suggestions

Hi guys! I'm working some problems for our exam in a few weeks and there are a few problems we are unable to solve. One of them is: "A homogenous rod is free to rotate without friction around one of it's ends. Find the reaction force in function of the position of the rod." As you can see the...

How is the energy of products in endothermic reaction more than the energy of reactants When we see the following equation of an endothermic reaction below 2H2O2--> 2H2O + O2 The 2H2O2 has an enthalpy of 2144 whereas the products have and enthalpy of 1424 Kj/mol SO the reactants have more...

In substitution reaction between bromine and hexane, why the bromine should be in organic solvent? Bromine is already a liquid!

Homework Statement The problem statement is as stated in the attached image, For a given E and cross section of both beams, I am to find the reaction at roller E that attaches beam AB and DC Homework Equations There should be stress relation equations and reaction equations. First is...

Would it be possible to produce a fusion reaction(fusing deterium atoms) using x rays instead of high voltages? Scientist are trying to create fusion using laser, which is just focused photons, but if you have energetic photons such as x rays, which would knock the electron of the deterium atom...

Homework Statement Please see attached photos. I've been drawing and re-drawing diagrams but I'm at a loss. For part a, I've tried a right triangle using the top cable as the hypotenuse. I've tried the force equation (ƩF=ma) but I don't think that's right. I just can't get a start...

I have heard different things about this reaction and its products. For practicality, I would appreciate a comprehensive formula, including heat/energy on both sides if you wouldn't mind. And for future purposes, it would be great if you could explain why to me. Just a good, wide explanation of...

Homework Statement Homework Equations r * \alpha = atan r * \omega^2 = arad The Attempt at a Solution arad = (L/2)(3g/L) = 3g/2 atan = (L/2)(3g/2L) = 3g/4

Hi guys ^^ I am still at A level physics, so don't flame me for my lack of knowledge Now i have been taught that for ex: We have a block of wood named A at rest on a perfectly smooth surface. If we analyse a free body diagram, we have a weight mg downwards acting on the block and a normal...

This is what the completed reaction looks like Na2CO3 + 2HCl ⇔ 2NaCl + H2O + CO2 My question is how did they get the products in the above reaction. Here is my attempt, but I don't see how to get it like in the above reaction Na2CO3 + HCl ⇔ NaCl + HCO3 The HCO3 breaks down as follows...

Hi! I write this letter to confirm the safety of a reation. I've heard that one of my friends made his hands injured because he touched it without knowing that it is the sulfuric acid. And, he told me that he washed his hands with the vinegar. Do you think it is right to use vinegar to...

Homework Statement A firewoman opens the fire hose, and water sprays forward. What is the action force and reaction force? Homework Equationsnone The Attempt at a Solution I was thinking that the action force would be water pushing on air and reaction air pushing on water? But how...

Homework Statement I was doing this problem for HW online, that asks to write the ionic equation for a reaction, but I'm completely stuck. After using all my attempts (i.e., I can no longer submit the answer even if it is right, :frown: ) I still couldn't get the right answer. We've only...

[FONT="Times New Roman"]The radionuclide X has a half life of 2.58hours and is produced in a cyclotron at a constant rate by bombarding a Y target with 2.10 MeV deuterons. The target contains only the stable isoptope Y and the reaction that produces X is Y + deuteron -> X + proton show...

How can you tell whether a reaction is an elementary reaction without knowing the reaction mechanism? I had this question on a recent midterm and got it wrong: A -> Product Is this an elementary reaction? I said yes because it has no intermediates. In retrospect there's no way I could...

This is not a question from a textbook, I am just supposing a situation. A book is lying on a table with some friction. If I push on the book, the book will push on me with an equal and opposite force; the book will then push on the table with friction, and, in return it, the table will push...

Hi Have got a device that is puzzling to say the least. The device is suspended by a thread i.e. no interaction with the ground. I am rotating four tubes each containing magnets which are being rotated into the repelling magnetic field of a magnet that is fixed to the body The following...

[SIZE="5"]how the rate of heterogeneous reaction changes with the surface area of catalyst. can anyone tell me about the equation relating both quantities?

hello forum, consider an object attached to a rope and rotating in a horizontal loop. The tension T in the rope provides the centripetal force points toward the center of the loop. But forces always exist in pair (action-reaction). what is the other force in the pair where one of the...

Three substances of nickel, chromium and cobalt, lead to dermatitis ratio accounted for 25 substances, the first, third and fourth place. Does anyone have any suggestions on what kind of reactions between metal and sensitivity skin? Thanks in advance for any suggestions

Homework Statement Balance Cl2+NaOH -> NaCl + NaClO3 + H2O

Homework Statement Write a balanced net ionic equation for the following chemical reaction Homework Equations Cr^{3+} + ___NH3 (aq) + ____H2O (l) → Cr(OH)3 (s) + ___NH4^{+} (aq)The Attempt at a Solution The balanced molecular equation is Cr^{3+} + 3 NH3 (aq) + 3 H2O (l) → Cr(OH)3 (s) +...

Hi today I took my O levels spa and the reaction was acidified KI+hydrogen peroxide. Once we see a slight colouration, we stopped timing the stopwatch. We were told to draw a tabulation box with the information in the experiment. Also we were told to clearly show the total volume of the solution...

What is the physics behind magnetorquers and reaction wheels which help in satellite attitude determination and control?

What is the physics behind magnetorquers and reaction wheels which help in satellite attitude determination and control?

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...

Does increasing the amount of mass of the catalyst increase the rate of reaction? I'm not sure as increasing the volume of one reagents doesn't increase the rate of reaction. But for a catalyst I'm not sure if it works the same way. If the catalyst is solid then the concentration will be...

We were doing a small assignment on rates of reaction and I plotted the data I received from the lab we did today. It looks like a perfect graph of log(x) I have no idea why the instantaneous rate of change decreases over time. We haven't done this (we were only asked to graph, we're doing the...

Hi everyone! I basically understand how the materials used in the chemical reaction of a battery work but now I want to know why some batteries have different ratings of voltage. From what I've read, this depends on the materials that are used. What does it mean for some materials to do...

Homework Statement For the production of chlorobenzene reaction: 1) C6H6 (l) + Cl2(g) → C6H5Cl (l) + HCl (g) 2) C6H5Cl (l) + Cl2(g) → C6H4Cl2(l)+ HCl (g) 3) C6H4Cl2 (l)+ Cl2 (g) → C6H3Cl3(l) + HCl (g) Is any of the C6H4Cl2 produced in reaction 2 used up in reaction 3? Homework...

I have this reaction mechanism but I am not sure if its correct or not. In lab we reduced the m-nitroacetophenone using tin and HCl and then using sodium hydroxide to make m-aminoacetophenone. This mechanism goes beyond the scope of our class and not sure why our lab teacher had us do it and its...

What kind of reaction is hybridization.It is endothermic or exothermic.

Homework Statement I need to work out what is happening with the above reaction. Why is my data showing a very slow hydrogen gas production rate (if it even is hydrogen gas), in fact, even slower than the production of hydrogen gas from the reaction of magnesium and ethanoic acid. All acids...

What is combustion - is it any reaction that produces energy? Or is it an exothermic reaction involving oxygen?

Hello, just wondering what would be produced when chloramine and dichloramine is introduced to sodium carbonate. In a reaction including dichloramine I can't decide whether the reaction would proceed as the following: NHCl2 + Na2CO3 ---> 2NaCl + CO2 + NO + H Or NHCl2 + NaCO3 ---> NaCl...

1-chloro-4-vinylbenzene ----> (i) Mg Turning/ THF ---> ? (i) Me3SnCl If this reaction is done, what will be the final product?