Reaction Definition and 1000 Threads

This may be bit weird but really do we get any product after the reaction of 118 elements of the periodic table.We know masses of reactant = masses of product.But no so in nuclear fission and fusion.Anyhow finally what might be that product?and what is going to be its state.Please explain me...

Homework Statement I'm having a hard time finding the support reactions R_{fx} ; R_{fy} ; R_{kx} ; R_{ky} in this truss. 2. The attempt at a solution I got four equations using the equilibrium conditions (sum of forces along x and y ; sum of moments on F and on C) but the system doesn't...

I have obtained an experimental setup of a Marx bank which has electrolytic liquid resistors. In the tubing of the resistors are various strength solutions of copper sulfate. I was told that the electrodes are copper but there appears to be some sort of plating or other reaction occurring...

I know that normal force is not a reaction force to the gravitational force; - First, because the gravitational force is from Earth on the object (action force) thus the reaction of force is simply form the object on Earth according to Newton's third law. - Also because in certain situations...

If I have a chemical reaction in closed system, how can I evaluate the change in T and P? I have: - one equation for the chemical equilibrium - one equation for the energy balance but I need an other one! entropy balance, maybe? Thanks Ric

Hi! I've got this problem: 1,20 g of NaHSO4 is dissolved in water to 1,0 liters and pH=2,194. What is the acid dissociation constant for HSO-4? I assume I have to start with writing the balanced reaction, but I don't get how I do that. I know that I'm supposted to start with NaHSO4 + H2O , but...

Does anyone know of any studies into exactly how much various metals reflect or absorb microwaves with relationship to the microwaves wavelength and ideally theyt compounds too?

Homework Statement this question is about the organic reactions shown in the diagram. ( diagram shows that butan2one is reaction with a reagent P and Q and then reagent R and forms propanoic acid and iodoform) a)name the reagents P and Q used in reaction 1. b) identify the reagent R used in...

Hi, I'm hoping to get clear on some chemical nomenclature. A "chemical reaction" is a process that involves some sort of chemical change. But a conformational change doesn't involve a chemical change, just a shape change, thus from what I understand, it cannot be termed a "chemical reaction"...

Homework Statement If you have an object say in a vertical pipe, which only has a gravitational force acting on it would the reaction forces only be friction forces? If this is the case how would you calculate the forces? would you calculate the friction force using the friction coefficient or...

What would the theoretical maximum possible speed be for a platform on a horizontal air-bearing (friction-less), if the only propulsion was a spring powered machine gun with unlimited steel balls? The balls go one way, the platform moves proportionally in the opposite direction. Ignore inertia...

Homework Statement Homework EquationsThe Attempt at a Solution C=C double bonds means that it is not an Alkane because an Alkane is saturated hydrocarbon. So the answer should be from A, B or C.

Homework Statement Consider beam “A-B” and strut “C-D” from Figure QA1. The beam “A-B” is hinged at point “A” and hinged with strut “C-D” at point “C”. It has an applied force of 8 kN applied at point B as shown in Figure QA1. Strut “C-D” is hinged at point “D” and it is also hinged with beam...

Homework Statement We have a second order reaction: A + B → C + D with -rA = k[A][ B] [A]0 = [ B]0 = 300 mol / m3; τ = 11 minutes. k = 4.0 × 10-4 m3 / (mol × minutes) What is the conversion in a CSTR?Homework Equations I think: τ = ([A]0 - [A]1) / -rA,1 τ = (XA × [A]0) / -rA,1 But since I...

Is there a reaction of which the product is the catalyst for that same reaction?

Homework Statement The problem asks to find the reaction forces for each of the bearings. For such bearings, the reaction forces can be looked up in a textbook, but they just act perpendicular to the shaft. Homework Equations Sum of the forces and moments = 0. The Attempt at a Solution I...

Greetings, ME major here trying to brush the cobwebs off my chemistry. I can't seem to remember or recognize anything on my old chemistry textbooks regarding the optimization of a reaction. I question whether it was even taught. I'm trying to determine the most favorable conditions to ensure...

Homework Statement In the following fusion reaction, a deuterium nucleus (D) combines with a tritium nucleus (T) to form a helium nucleus (He-4). If the following masses of deuterium and tritium are used to produce energy, calculate the total amount of energy produced. Homework Equations E =...

The instructions only specified that phenylethanone would react with NaH followed by an acid quench. I know that NaH provides a hydride (H-), and this will "take" one of the hydrogens on the exposed methyl group. I followed this by pushing electrons so that the negative charge was on the...

Hi I am new to the concept of neutralization. My teacher told me that acids do not react with neutral salts. I want to know why not. If both are dissolved in water and both completely dissociate, why can't the ions of acid and salt exchange and perform a double displacement reaction. Moreover I...

Homework Statement Consider the following reaction $$\mathrm{Ni^{2+}_{(aq)} + H_2S_{(g)} \to Ni_{(s)} + S_{(s)} + 2H^{+}_{(aq)}}$$ What are the activities of the terms in the reaction? Homework Equations The activity is defined as ##a = c/c^\circ## in ##\mathrm{ mol \, dm^3}## 3. The...

This is probably the weirdest chemical reaction you'll ever see.

For a 4x4 beam 12' long supported by 4x4 8' tall colums I need to calculate the moment around A and B and the vertical forces at A and B based off the point load which for discussion purposes is in the middle of the beam but could be anywhere on the beam. Does anyone know the calculations? I...

Forgive my current brain fart, but just posting here for some confirmation of my thoughts. I have a cart with a similar setup to a rear wheel wheelbarrow. Assuming static conditions, I am trying to determine the vertical reaction force (FA) from the ground when applying a horizontal force to...

Homework Statement In hydrogen atom ionization H→p+e show that ##μ_H=μ_p+μ_r## Homework Equations G=μN (N is the number of particles) The Attempt at a Solution (1) I think the question should say "Find chemical potential relation AT EQUILIBRIUM", don't you think? (2) My professor said that...

Hello, An object moves outward in shaft radially due to centrifugal force. lest say it weights 1kg . in a timestep=0.0001 it travels 0.0017 meters this is actually the difference of two radius, let say first radius r1 = 0.25 meters second r2 = 0.25 + 0.0017 meters rpm of the rotating system...

Homework Statement Homework EquationsThe Attempt at a Solution [/B] As this is an indeterminate structure with degree of redundancy 2, I have released support B & C. I then draw the BMD M0 of the Primary structure as well as BMD m1 and m2 of unit load system acting on B & C as follow: I...

Homework Statement What mass of methane must be combusted with excess oxygen to generate enough heat to warm 675 g of water by 25.0 C? (assume no heat lost to surroundings)Homework Equations Specific heat of H20= 4.184 J/g*C q = mCT balanced equation: CH4 + 2O2 -> CO2 + 2H2O The Attempt at a...

I want to understand why the reaction force of the short cable and link cable is in this direction? I want to understand it instead of memorizing. Your help would be much appreciated. Thanks in advance!

I'm currently doing a literature review on ultracold chemistry with an emphasis on collisional theory and quantum phenomena. I'm an undergraduate physics major, and I'd start my discussion of this topic by moving from basic Newtonian conservation laws and concepts like Coulomb repulsion to the...

Hello all, I've used physicsforums a few times over the years, but I believe this is my first post. I'm working on an engineering project in which I need to find a highly-endothermic reaction where the reactants and products will be stable at very high temperatures (well over 800C), or at least...

Here is the code you input into matlab. Aini etc, are the initial values of the population densities. A for predator, B for Prey. % example for ODE and Gillespie % one reversible reaction b1 = .033; bo = .00047; a1 = .0022; ao = .00055; Aini = 5168; Bini = 34; %% Basic ODE simulation...

I am having trouble recognizing reaction forces. for example, problem 6.8 on pin C there is no y component, the argument there was because there is no vertical member attached to C. That is understandable, but if we follow the same logic then there should not be an x component on pin A in...

Copy and paste if you want to use any of this code. Its a simple iteration of converting biomass of elk into new wolves. % example for ODE and Gillespie % one reversible reaction b1 = .033; bo = .00047; a1 = .0022; ao = .00055; Aini = 5168; Bini = 34; %% Basic ODE simulation dt = 0.01...

Homework Statement What will result in the reaction of benzene with acetone in sulfuric acid? Homework Equations The Attempt at a Solution Is bisphenyl correct?

Homework Statement The combustion of 0.1577 g benzoic acid increases the temperature of a bomb calorimeter by 2.51°C. a) Calculate the heat capacity of this calorimeter. (The energy released by combustion of benzoic acid is 26.42 kJ/g.) A 0.2123-g sample of vanillin is then burned in the same...

I'm hoping I can find a place to ask these types of questions as a student or layperson. Please no rude flames or responses. I am asking for help because the material is currently a bit out of reach for me. Can I get some help to understand. Thank you. From Analysis of Arches by Trupti Sonavane...

Homework Statement What product(s) does this reaction produce: Acetone + diethylamine Homework EquationsThe Attempt at a Solution That is what I got, but the answer is N,N-dimethylethanamide. Can someone please explain why?

Quick note: Sorry for dominating the homework help board, guys! But, I wanted to say thank you to everyone who replies to my excessive questions. This forum's input has become integral to me as I am in a position now where I can't go to my teacher for help because of the logistics of commuting...

Homework Statement What is the product of this reaction: p-methylbenzyn + 1,3-butadien? Homework Equations C6H4CH3 + C4H6 The Attempt at a Solution a bicyclic ring is formed?

I'm looking into chemical battery that use the molecular tension in chemicals like white phosphorus to store heat energy.But finding a way to slow and defuse the heat and flammability of phosphorus with tungsten and sliver is easy. But rebuilding the molecular tension is harder.

Homework Statement Write a chemical equation for addition reactions to produce 3-methyl-3-hexanol. Condensed structural formulas should be used for each organic compound.Homework Equations none The Attempt at a Solution https://i.imgur.com/REIpKHK.jpg Is this correct? My friend tried...

I was wondering how I could measure the rate constant k for chemiluminescence reaction of luminol (when oxidised by H2O2. I was told that I can use a lux meter that measures the intensity of light emitted, but I'm not so sure how this can be done since the equation calculating the rate constant...

Hello, this is my first posting on this forum. I enjoyed Chemistry in high school, though the arts were where my abilities drew me. I've learned that a ratio of 2 hydrogen to 1 oxygen, when ignited by a certain amount of heat, will create a small amount of water. I will give a brief outline on...

can someone help me with the 1989 question. i think part i is k2(c03) for ii the gas given of is co2. 1 one the precipitates given off was caco3. i am not sure what the other was. is it supposed to be a reaction between mgso4 +k2co3?

Suppose I am trying to push a heavy block on ground and I haven't applied a force stronger than the maximum static friction. The force of friction acts on the block and its equal and opposite force acts on the ground. Does the reaction force of friction(acting horizontally on the ground)...

<Moderator's note: Moved from a technical forum and thus no template.> OChem Question: My Answer: Not sure if this is correct. Anyone?

γ+2D ----> 1H + 1n In this photonuclear reaction, is it possible to write the momentum balance equation as it follows, MHvH = Mnvn It somehow seems to wrong to me, since the incoming photon has a certain momentum, which is not taken account in the balance equation. Thank you in advance.

I was just wondering what the reaction was from people and the media at the time after hubble's telescope took it's famous images? If I am not mistaken hubble's images where one of a kind showing that there where a lot of galaxies and whatnot out there. Was it advertised on the news a long...

Ok, so this is an undergraduate level question probably but consider this R. C. Hibbeler's Textbook on Mechanics of Materials says this about thrust bearings and smooth journal Bearings : In other words, it says nothing about reaction moments. Now this chart has other 2D connection types...