Reactions Definition and 650 Threads

1.What would be the effect of an increase in temperature on the rate constant of a) the forward reaction? b) the reverse reaction I assume the forward reaction rate constant would be increased due to a greater amount of kinetic energy of the reacting molecules resulting in more collisions...

How does double salt reactions work? Let's say, Cu(NH4)2(SO4)2 + NaOH --> ?? OR maybe Cu(NH4)2(SO4)2 + BaCl2 --> ? Thanks.

Hi there in my knwoledge the energy released in any nuclear reaction is because of the fact that the mass off the reactants is greater than the mass of the products and the missing mass is converted into energy but in a nuclear reaction the bindind energy of the products is greater than that of...

Homework Statement Find the reactions exerted on the members by the supports. Homework Equations Sigma Fx = Net force acting on x-axis = 0 Sigma Fy = Net force acting on y-axis = 0 Sigma M = Net Moments = 0 The Attempt at a Solution 10N/m -> changes to 4N at centre acting...

What will happen if two black holes are coming nearby? what will be the reaction (change in behavior)?

Homework Statement Calculate the value of the equilibrium constant at 25 degrees celsius for the following reaction: 5Fe2+ + MnO4- + 8H+ ----) 5Fe3+ + Mn2+ + 4H2O Homework Equations The equation above is the product of these redox reactions: 1) MnO4- + 8H+ + 5e- ----) Mn2+ + 4H2O E=...

I'm just curious, what was the first reactions to Einstein's theories (it was 1905, right?) ... were they refuted or supported? was it like "Oh! these are nonsense..these are pseudoscience .. we shall burn you"?! or were they garnered respectable amount of debate?... were they supported by...

In neutron activations, target materials are being beamed by high energy flux, thus making the target materials excited and undergo radioactive decay. Neutron analysis then can be performed after the materials are "cool" enough by placing inside the hood with enough shielding. My question is...

Hello, If a reaction is spontaneous when calculated using Gibb's Free Energy formula, Delta G = Delta H - (T*Delta S) Does it mean the reaction will occur at impossible temperatures even (such as 999999999999999999999999 degrees Kelvin) for ex: H2O(g) C(s) --> CO(g)+H2(g) Delta H =...

Homework Statement Homework Equations ΔH rxn = ΔH products - ΔH reactants ΔU = q + w The Attempt at a Solution Pretty overwhelmed with the entire problem. Since the ΔH's of all reactants and products were in the literature for the reference temperature of 298.15 K, I was able to...

Zn---Zn+2 + 2e-

Homework Statement If the following substances were heated what gas would be given off and what solid would remain? strontium carbonate, zinc carbonate, and iron carbonate. Homework Equations N/A The Attempt at a Solution So I presume carbon dioxide would be given off and the 3...

Hi, I know that there are a number of different ways that uranium-235 can decay when a slow neutron collides with it. I am trying to get a picture of all the possible reactions that can occur. One is U-235+n --> Ba-144 + Kr-90 +2n Another is: U-235 +n --> Xe-140 + Sr-94 +2n Can anyone give...

Homework Statement Homework Equations Kc = (Kp)/ (RT)delta n K_c = (K_a)(K_b) (Where a and b are the individual reactions while c is the overall reaction where the coefficients are the same) The Attempt at a Solution The question prior to this one has individual reactions as...

Hello everybody, I am having some troubles with this exercise. I have attached the text and the solutions to my post. My problem is, after I have coupled the angular momenta and used the CK coefficients like in (|\pi ^{+}p>=|1,1>|1/2, 1/2>=|3/2,3/2>) (pag.432) I don't understand what...

Hi, I just learned about oxidation and reduction reactions and I have some questions. Are all ionic reactions redox reactions? Do elements that make up covalent compounds always have an oxidation number of zero because they only share electrons, not give or take? That is what I was thinking...

Nuclear reactions in which the Q value is negative (endothermic reactions) imply that energy is absorbed in the process of the reaction. Is this to be interpreted as a case where the initial rest mass energy is less than the rest mass energy of the products of the reaction? If affirmative, it...

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...

Homework Statement "A lifting mechanism is mounted on the back of a truck as shown: Calculate the forces in each member and the reactions @ A & B for alpha=0 Homework Equations Sum of moments about A=0: 0=(5000N)(1m)+(-5000N)(-1.25m)+(By)(.5m) By=2500N The Attempt at a...

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.