Reactions Definition and 650 Threads

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?

1.) (a) Give the reaction, with molecular structures, of 2-propanol with KMnO4 and 1-pentanol with KMnO4 and calculate the differences in the average bond energies of the reactants and products (ignore KMnO4 and any other side reactions in the calculations). Answer:- the reaction, with...

i can't do this home work. i REALLY suck at physics, this is why I am here. can someone help me pleasse? :) 1#to combust completely 7g of iron, 2L of oxygen is needed. for each of the following state if any unreacred iron rests after combustion and if it does how much: a) 2g of iron and...

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...

Homework Statement You have the following reactions: 4He+14N => proton + 17O(Oxygen) 1 + 2 => 3 + 4 there 4,14 and 17 is protons+neutron in the nuclear of the atoms. 1 represents 4He, 2 represents 14N and so on. You will have two angles, theta3 and theta4, there theta3=63...

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...

Homework Statement Why do scientists take the rate of a reaction at the beginning of an experiment? Homework Equations The Attempt at a Solution I would say because the amount of the reactants and present conditions are already known. But, there is a hint that says "think slow...

[SOLVED] magnesium and acid rates reactions im producing an investigation in the reaction between magnesium a solid metal, and acids of varying concentration, pH and temperatures. these variables are to produce results for comparison. however i am unsure about what apparatus would be most...

This problem was proposed to us by our Chemistry professor. Consider a sample of a hydrocarbon at 0.959atm and 298K. Upon combusting the entire sample in oxygen, you collect a mixture of gaseous carbon dioxide and water vapor at 1.51atm and 375K. This mixture has a density of 1.391 g/L and...

Homework Statement How much weight would 5g of CuSO4 5H2O lose if ti were dried at 120 degrees C for 12 hours (i.e. if it were heated to drive off all the water of hydration)? The Attempt at a Solution CuSO4 = 159.61 g/mol H2O = 18 g/mol = 90 g for 5 mols 159.61/(159.61 + 90) =...

Hello, I was wondering if there are any exothermic (or otherwise spontaneous) chemical reactions that release hydrogen, in which the reagents and products aren't strongly hazardous? I know of the reaction of alkali metals with water, but these produce strong alkaline solutions.. Perhaps one...

Recently, we've heard about research into storing anti-hydrogen as a BEC. Atom lasers are touted for their potential to make ultra-precise measurements, including at the quantum scale, because of their small DeBroglie wavelengths in comparison to light. Once, I emailed Dr Wolfgang Ketterle...

Homework Statement Identify the oxidizing agent and the reducing agent and write a balanced equation for each half reaction. MnO4(1-) + VO(2+) ----> Mn(2+) + V(OH)4 (1+) Homework Equations None. The Attempt at a Solution I know how to do these when there is just one atom...

please check my work... urgent pleasezz 1> ZnCl2 [aq] + 2KNO3 [aq] → Zn(NO3)2[aq] + 2KCl (s) 2> Ca[OH]2 [aq] + 2Na OAc [aq] →Ca(OAc)2[aq] + 2NaOH (s) 3> NiCl2 + 2KOH → Ni(OH)2 [aq]+ 2KCl (s)

If CO is released abowe heated Cu when gets CO2. When THAT CO2 is released abowe active C gets CO. When this experiment is done we have double quantity CO . CuO + CO = Cu + CO2 C + CO2 = 2CO Do you know more "growing" quantity reactions? P.s. Sorry for my bad english

In my question i have a square cloth piece of dimension 8m*8m and the mass per area of the cloth is 0.5kg/m^2 .I need to find the reactions at 4 supports.IN first case Cloth is attached in such a way that first i attach one corner to one support then the other corner which is on a diagonal to...

when you're doing RICE tables for weak acid/base reactions, when do you neglect x? thanks for ANY input :biggrin:

Homework Statement All I'm trying to do is translate the cell diagram below into a into a an equation so I can determine which is the anode and which is the cathode. Here is the cell diagram. I know how to balance it, I just want to make sure I'm putting reactants and products on their...

Ok I'm trying to do my chemistry homework and well I'm stuck. I have the first few questions done I'm stuck on question 5 step 3, an I'm not sure the other are correct. I still have no idea how to balance equations and well here we go again with balanceing things... 1. What is the difference...

Write equations for the neutralization reactions that result in the formation of the following salts: lithium carbonate H2CO3 + LiO2 --> LiCO3 + H2O copper (II) chlorate 2HClO3 + CuO --> Cu(ClO3)2 + H2O aluminium sulphate 2Al(OH3) + 3H2SO4 + 10H2O --> Al2(SO4)3 * 16H2O ammonium...

Please click on the image to make it larger. http://img177.imageshack.us/img177/2355/staticsqn5.th.jpg I understand the problem here, what I don't see is how to find the support reactions. Since at each joint we have more than two unknowns I have to find the support reactions. I have the...

Hi. Not directly a specific homework question, but it will help with some of my questions. When the bridge is flat, why is the reaction force from the wall on the bridge angled upwards? Why is it not horizontal, along the length of the bridge? Sorry if i was a little vague. Thanks, Dan.

im wondering what reaction would likely occur 2NO (g) → N2(g) + O2(g) or the reverse 2CO (g) + O2(g) → 2CO2 (g) or the reverse well the first one would occur if it were the reverse because of the high temperatures in the engine, but I am wondering about carbon monoxide, what do you guys think

2CO (g) + O2 (g) → 2CO2 (g) 2NO (g) → N2(g) + O2 (g) what do i have to do, so i have to say the best temperature is at 25 celcius and at 1 atm, how do i figure this out is their a way, or i have to look it up on the internet

2CO (g) + O2 (g) → 2CO2 (g) 2NO (g) → N2(g) + O2 (g) how can i figure out the best conditions for these reactions

Homework Statement 1) Give the resultant fomula for: Cr2+ gets reduced. 2) Will the following reaction occur? Acidified K2Cr2O7 solution is added to HNO3(nitric acid). Homework Equations N/A The Attempt at a Solution 1) I put: Cr+2 + 2e- ---> Cr(s); I have one question...

I can not seem to understand what happens when you react ammonium with certain compounds. For example NH3 + Cu(NO3)2 = ?. How am I supposed to do this?

Are all exothermic reactions chemical changes since they release heat?:confused:

Hello, there something that doesn't make sense to me in the attached problem, P16.3. You can see from the diagram that you will have two reculting reactions, RA and RB. According to what I know from statics, the reactions will be at the same angle theta as the incline of the plate, see my...

Does anyone know where I can find information on these kinds of reactions such as the possible chemical combinations, reactions and decomposition temperatures, energy stored and released per unit mass, etc? Thanks! -Brendan

I'm having extreme difficulty identifying some precipitates I obtained from combining a solution of Aluminum Nitrate and Sodium Carbonate. The result was an orange precipitate. I have searched high and low (complex ions, decomposition, redox, etc) but I can't figure it out. Please HELP!

Homework Statement The reaction: CO + Cl <-> COCl2 has the rate law: rate = k[CO][Cl2]^(3/2) Show that this rate law is consistent with the mechanism: Cl2 <-> 2Cl (fast) Cl + CO <-> COCl (fast) Cl2 + COCl -> COCl2 + Cl (slow) (i don't know how to do superscript and subscript on...

The question: Balance each of the following skeletal equations by using oxidation and reduction half reactions. All the reactions take place in acidic solution. Identify the oxidizing agent and reducing agent in each reaction. a) Cl2 (g) + S2O32-(aq) --> Cl-(aq)+SO42-(aq) My answer so...

Homework Statement Does combustion reactions always result in water and carbon dioxide being formed, can it just have water or just carbon dioxide, or does water and carbon dioxide not need to be products. Furthermore would Iron(II)oxide(s) + oxygen(g)--> iron(III)oxide(s) be considered a...