Reactions Definition and 625 Threads

I found this the other day and it made me think of Danger and Artman from the The Thread Killers Thread. Kurdt says the video is ok, and he's a prude. Hope you enjoy!

Homework Statement I'm to design a crane, and therefore I need to find the reactions in the jib and also make the crane stable. 1. I need to find the max. load that the crane is able to lift. Therefore i have to find the reactions where the horisontal and vertical boom is meeting. 2. I need...

Homework Statement Determine the support reactions for the given structure(see attachment) due to flexural deformations using castigliano's second theorem. Axial deformations are considered negilible. Homework Equations delta = dU / dP The Attempt at a Solution See attachment. I could use...

OF2 --> F- + O2 + H2O OF2 --> F- 2H+ +OF2 --> 2F- + H2O 2H+ +OF2 + 4e- --> 2F- + H2O This is as far as I can get. I don't know how to do the other half of the redox since the equation would be: OF2 --> O2 + H2O What do I do here? Maybe I am not setting this up correctly?

Homework Statement Balance the following redox reactions occurring in an acidic solution. Homework Equations PbO2(s)+I-(aq)---->Pb2+(aq)+I2(s) The Attempt at a Solution 1.) half reactions: a.) reduction: I-(aq)----->I2(s) b.) oxidation: PbO2(s)------>Pb2+(aq) 2.) balance...

Hi, can anyone show the correct method of how to solve a problem like this. Got the answers from my book but have no idea how they get them? Thanks James

I'm having a lot of trouble with this problem! What mass of lead sulfate is formed in a lead-acid storage battery when 1.34 g of Pb undergoes oxidation? the answer needs to be in grams

Hey I'm studying for my chem exam & I am having difficulty solving some problems. 1. 1,3cyclohexadiene + Br2= ? Here,should i treat it like a conjugated diene? Meaning that the Br molecules will have 1,2 and 1,4 additions on the diene and 2 products will be there? 2. 1,4cyclohexadiene +...

I'm writing a book but my chemical knowledge is near non-existent and I need a TRUE scientific reason as to why warewolves would be 'allergic' to silver. I know I could make something up but I would like to have as much fact as I can when it comes to stuff like this. It'll help me stand out.

Homework Statement One of the thermonuclear or fusion reactions that takes place inside a star such as our Sun is the production of helium-3 (3He, with two protons and one neutron) and a gamma ray (high-energy photon, denoted by the lowercase Greek letter gamma, ) in a collision between a...

Homework Statement Hope you can access this link for question http://s353.photobucket.com/albums/r387/james_nikko/?action=view&current=img002.jpg Supports are at 1.5m and 4.5m Homework Equations The Attempt at a Solution Ok so i have attempted the problem using the following (5x1.5) + (5x3)...

I was taught in high school that all reactions are governed by the valence electrons. of the atoms involved. Then I was taught that the term "redox reaction" applied only to rxns where e- were exchanged, or oxidation numbers were changed. But the first fact would lead me to believe that...

Hey. Im currently doing a course in numerical analysis, and while most of the focus is on the mathematics side of things, the assignments are set in an engineering context. One of my assignments describes a beam that is "pin jointed" at both ends, is 1 meter long, and is subject to a 0.5 N/m...

Homework Statement The pipe assembly shown in the picture supports the vertical loads shown. Determine the reactions at the ball and socket joint (point A) and the tension in the two cords BC and BD. Homework Equations Sum of Forces = 0 Sum of Moments = 0The Attempt at a Solution I first...

I was wondering how come when ever there's a question like aluminum reacts with bromine it is usually written like Al + Br2? or Potassium reacts with oxygen is K + O2? How do we know when there's 2 of them?? Is there like a special rule? Why isn't there K2 or Al2??

Homework Statement 1. A flask initially contains only NOBr gas. Once heated to a temperature T, 34.0 % of the original gas decomposes via the following equation to give a total pressure of 0.25 atm at equilibrium: 2NOBr(g) \Leftrightarrow 2NO(g) + Br2(g) Given a KC of 3.94 x 10-4 I...

Where does most of the heat energy in fission reactions come from? -Does it come from radiation emitted from particles leaving the nucleus? -Does it come from those actual particles leaving the nucleus and hitting surrounding gases in the air, causing them to move and heat up? -Something...

Expansion Work -- Still confused. This is more of a general question regarding thermodynamics. If you have a combustion reaction, and it produces either liquid water or water vapor--which case results in higher expansion work? My enthalpy calculations show higher PV work for the reaction with...

Please someone who can help me to find the reaction rates of these reactions NiOOH + H20 + 1e- <====> Ni(OH)2 + 0H- Zn ----> Zn 2+ + 2e- thanks to all

Hi guys today in the lab i did reaction of barium chromate with hydrochloric acid and when i add HCL to barium chromate i got a reddish orange solution but when i add sulphuric acid i got a colorless solution with yellow ppt. Why is this so? Shouldn't both give me the same result since they are...

Organic Chemistry Reactions - Check my Answers, Please! :) this is the lab that we have to do in class: http://academics.eckerd.edu/instructor/grove/gorgchem/Extraction%20Lab.pdf http://picasaweb.google.com/lh/photo/cnIZmcws9cN3v_1TDx7nfg?authkey=Gv1sRgCI-xv4Hl9tampgE&feat=directlink

Homework Statement HIO3 + FeI2 + HCl ==> FeCl3 + ICl + HOH Homework Equations Directions say it's in an aqueous solution, and HCl is a reactant, so you can add H2O and H+ to balance, right? The Attempt at a Solution I first found all the oxidation states: HIO3 H = +1 I = +5 O...

Homework Statement Find whether the following is spontaneous. Forward= (process as written), backwards, both or none Homework Equations 1. water & syrup mixed to give a flavoured drink 2. Piece of paer at room temp react with O2 to give CO2 and H2O 3. Bathtub water gets cold after you...

In the BBC film Einstein and Eddington, Eddington describes the theory of spacetime using a table cloth (space), a loaf of bread (sun) and a piece of fruit (a planet). The Bread is placed in the middle of the table cloth, this forms curves in the cloth. He then takes a piece of fruit and...

Homework Statement Describe the preparation of 40 L of 0.0500M phosphate buffer, pH 6.9 starting with 1M solutions of KH2PO4 and K2HPO4. pKa= 7.2Homework Equations pH= pKa + log[A-]/[HA][b]3. The Attempt at a Solution [/b 6.9=7.2 + log[A-]/[HA] -0.3= log[A-]/[HA] [A-]/[HA]= 0.50 0.5[HA]=...

balance the following oxidation reduction reactions. which is the oxidizing agent? reducing agent? ()my answer as balance a) P4 + Cl2 =(4)PCl5 reducing agent P, o agent Cl b) Sn2+ + Cu2+ = Sn4+ + Cu+ reducing agent...

i know no one can diagnose me on here, I'm just looking for opinions and maybe guidance to things to research. my body has a strange way with medicine. 98% of the drugs I've taken (legal and otherwise...) don't work as they are supposed to. i usually have to take a double or triple dose to...

Hi, I'm in first year organic chem and we're obviously learning about all the different reaction mechanisms (e.g. elim reactions of alcohols) and I was wondering if the only way to figure out what is going to happen in a particular reaction is to memorize all these different reaction...

what is spallation ,nuclear reaction and induced radioactivity ?how to identify these all ?

Homework Statement When copper metal is placed in a beaker containing a solution of silver nitrate, a reaction occurs which can be represented by the following equation: 2AgNO3(aq) + Cu(s) -----> Cu(NO3)2(aq) + 2Ag(s) a) Give the net ionic equation to represent this reaction occurring...

Hello everyone :smile: I'm just wondering why is cooling considered to slow reactions. I mean f you want condensation heating would slow the reaction. I like to know exactly how condensation occur at molecular level. I know when you heat gas it expands. So when you cool a gas does it...

like mixing household chemicals together to get a cool reaction to help my brother for the science fair? please don't say baking soda and vinegar half the school is doing that for a volcano.

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 ?