Reaction Definition and 1000 Threads

Homework Statement In a general sense, how do you determine what the product will be in a chemical reaction? In the first example, a gas evolution, you combine the cation of each compound and pair it with the anion of the other: HNO3(aq) + Na2CO3(aq) ----> H2CO3(aq) + NaNO3(aq)...

Hi, Is the reaction between potassiumhydrogensulfate & potassiumhydroxide a proton-transfer reaction? If it is, it must also be an acid-base reaction. But the problem is that its not a reaction between an acid & base, but between a salt & a base! Thanks!

Hey there PF, I'm trying to determine the reaction equation for a little home experiment I've been conducting. The setup is very minimal: copper metal in a solution of 3% H2O2 and 5% CH3COOH. In reality, I'm probably missing something fairly straightforward. The reaction occurs very...

Hello! I need to find the force exerted by a sphere on an object, with the height of the object on the sphere and the object of the mass konwn. I need to find the reaction of the spherical surface on the object. Thanks!

In an liquid fluoride thorium reactor, how is the reaction started? My assumption would be a piece of fissile material would be somehow inserted into the fuel to introduce neutrons to the solution, but I have not found any information to show if this is how the reaction is started. If this is...

Hi, Hydrochloric acid is the acid & water would be considered the base. Also does this mean that if there are more H20 molecules the solution would be considered a base? And if we have more HCl molecules than H20 this means the solution could be considered acidic? If so is it possible...

Homework Statement Find reaction for given. one beam 15 ft long supported at end (R1) and supported 5foot in from the ohter end (R2). 2000 lbs load is location at the very end on the beam 5foot from r2 Homework Equations how do I determian the reactions? I know how to draw the shear...

Hello there, I am supposed to experimentally determine (with the use of a calorimeter) the overall heat of reaction per mole of calcium metal in two cases: 1. When I mix HCL, calcium and water in that order. 2. When I mix water, calcium and HCL in that order. In each case, I am...

Newtons third law states that there is a counter force to every force. Unfortunately this doesn't seem to work for moving point charges. The Coulomb force cancels out but the B-Field of a moving point charge is: \mathbf{B}=\frac{\mu_0}{4\pi}q...

hey guys i am wondering what the difference between using Fe2O3 or FeO would be in a thermite reaction to produce aluminium oxide. wouldn't the FeO produce a more energy since its enthalpy of formation is lower? thanks for your answers!

Homework Statement Is the following reaction possible? If so, by what force? Draw (one of, if applicable)the lowest order Feynman diagrams for the process. n + n-bar --> ∏+ + ∏- + ∏0Homework Equations N/AThe Attempt at a Solution This process, it seems to me, should be possible. It...

Is there any type of software that can figure out the product of a reaction, such as organic chemistry reactions?

Complcated Chemistry Reaction - impossible?? Help :( My notes say: Step 1 is a 221 reaction. If peroxides are used in your version, then the anti-Markovnikov bromide is formed. If your version had only HBr, the the Markovnikov bromide is formeed. Step 2 creates organolithium or Grignard...

I am trying to determine the change of heat for: N2H4(g) -> N2(g) + 2H2(g) Here is what I did and what I got the correct answer is -86.0 which I am clearly not getting [(163)+ (2*436)] - [(4*391) + (163)] = -692 thanks for any help!

Homework Statement A meter stick is held vertically above your hand, with the lower end between your thumb and first finger. On seeing the meter stick released, you grab it with these two fingers. You can calculate your reaction time from the distance the meter stick falls, read directly from...

For we to obtain metallic magnesium from sea water we can precipitate it in the form of magnesium hydroxide if we add calcium hydroxide: Mg2+ + Ca(OH)2 → Mg(OH)2 + Ca2+ Why does this reaction happen?

Basically, when a natural frequency acts on coke bottle, It resonates. During the resonance, the lump of air in neck of it goes under simple harmonic motion. It goes in and out the bottle, increasing and decreasing pressure of cavity of coke periodically. When air goes inside the bottle, the...

Homework Statement I understand how metallic oxide dissolve in water to produce OH- ion due to high electronegativity of oxygen. But I am having trouble understanding how non-metallic oxide dissolve in water to form acid? For Homework I have to explain the reaction of Sulfur trioxide in water...

I read that matter-antimatter annihilation is not as useful as we thought because a large amount of energy is carried away by neutrinos. So, how much is this energy ? What is the percentage of the lost energy to the energy calculated from E=mc^2 ?

Homework Statement https://dl.dropbox.com/u/63664351/Physics/MECH1.PNG Homework Equations Sum of Forces and Torque = 0 The Attempt at a Solution I found similar problem here: http://farside.ph.utexas.edu/teaching/301/lectures/node133.html Why is there no vertical reaction on a...

In "Future? Tense!" in his essay collection From Earth to Heaven (1965), Isaac Asimov wrote about the nature of science fiction. He noted that science-fictioneers are stereotyped either as indulgers in weird fantasies or as farsighted predictors of the future. After discussing some SFers'...

According to Newton 3rd law, every action will have a reaction. but how about buoyant force? if the buoyant force is the force of water on object then the reaction force will be the force of object on water. but is it other name for this force? thanks for reply.

I'm only in a high school class. I just made up this problem to see if I'm getting the right idea in the long run. That, and then there's the fact that differential equations are SO MUCH FUN! :biggrin: Homework Statement Molecular bromine (initial concentration: 0.49 M) and formic acid (initial...

I think enthalpy of reaction is the amount of energy released when that reaction takes place (correct me if I'm wrong), but enthalpy of reaction is often written as per mole of something. As in kJ released per mol. What does the per mol represent? There are probably many reactants and products...

Homework Statement I had an assignment where I needed to calculate reaction rate constants at different temperatures. I was supposed to use ab initio method (meaning I should use Spartan software), molecular partition functions and Eyring equation. The reaction was: H+HD...

Homework Statement The problem given was to find out the resulting compound of this Wurtz reaction process using dry ether (Na). Homework Equations Now the main problem I faced was how to remove the Cl-atom and Br-atom. I am new to this so please help me out. The Attempt at a...

Homework Statement From 9th edition of Raymond Chang's Chemistry (Problem 4.108): "When 2.50 g of zinc strip were placed in a AgNO3 solution, silver metal formed on the surface of the strip. After some time had passed, the strip was removed from the solution, dried, and weighed. If the mass of...

Homework Statement Find the substitution products of ( 2S, 3S)-2-chloro-3-methylpentane + CH3O- in SN2 reaction. The Attempt at a Solution Will the anti-attack of the nucleophile result in the change of S to R for both the chiral carbons or just for the one with Cl connected...

Hi everyone! I'll say it from the start that I'm not knowledgeable with chemistry but I'll call for anyone's help in making me understand this simple reaction. I'm interested in finding out what reactions are occurring when CO2 is dissolved in water. The scope is for my hobby which is...

How much mass is lost in a single D + T= 4He fusion reaction? And is all of the mass lost converted to energy or just some? The mass lost can be converted to energy using e=mc2.

Homework Statement determine the change in enthalpy for the following reaction from the enthalpies of formation for the reactants and products. (C6H5OH -165 kJ/mol, CO2 -393.15 kJ/mol, H2O -285.83 kJ/mol) Homework Equations The Attempt at a Solution No idea, been a while since I...

the equation from my textbook: 2k+2H2O yields 2KOH+H2 why? I thought that such reactions are when one element swaps with another but in this case, there is an extra H2

Homework Statement (see attachment) Homework Equations The Attempt at a Solution It looks to me a type of Claisen condensation but i did not realize it until i checked my book. Before checking the book, i tried to do it by thinking on what is given in the question. We have a...

The reaction I did for the lab is: H2SO4 + Mg --> MgSO4 + H2 In my graph, there displays the two variables - the concentration of sulfuric acid and the average rate of reaction in direct proportion. How do I explain the trend? I know I can explain this qualitatively using collision...

I know that first we have to add H2 and a Lindlar catalyst in order to produce what is the reactant. I thought adding O3 would be an ozonolysis reaction. An ozonolysis reaction should yield this: I don't know why they added the Zn and CH3CO2H, though. What does this even do in the...

Okay, I am trying to determine the product of hept-2-yne with HBr. It looks like: CH3CH2CH2CH2C≡CCH3 + HBr I thought this thing would follow Markovnikov's rule, making the Br attach to the most substituted carbon and the H attach to the least substituted carbon... I thought the...

Homework Statement I'm just having a little difficulty understanding this E2 reaction. The Attempt at a Solution Okay, so I know that this is a one step reaction. Br is the base, but does water (the solvent) have effect on the reaction? I just assumed the Bromide would attack the H in...

1. Complete and balance the following equations, and identify the oxidizing and reducing agents: 2. Rules. 1) an element that is reduced Gains electrons and loses Oxygen 2) an element that is oxidized loses electrons but gains Oxygen 3. My attempt Oxidizing Agent: 5e + 8H + MnO4 ^(1-) --->...

Abstract The proposing Method unlike to using now others comprises in usage for plasma creation and its further ignition the created in-situ halo-layer of high-energetic particles to the puffed gas. For realization of Method the following procedures should be performed consistently and...

Homework Statement Complete the following reactions, giving the correct structure for each organic product: eugenol + FeCl_3 -> eugenol acetate + FeCl_3 -> Homework Equations The Attempt at a Solution When I did this lab, my partner and I didn't notice a reaction when we...

Homework Statement 609.5 grams of vanadium (II) oxide, VO, and 832 grams of iron(III) oxide, Fe2O3, react according to the equation, which substance(s) and how many grams of each would be in the tube after the reaction completes? 3 points Homework Equations Equation: 2 VO + 3 Fe2O3 -> 6 FeO...

Homework Statement (see attachment) Homework Equations The Attempt at a Solution I am clueless here. I can conserve angular momentum but how will i find the "impulsive reaction"?

I read online that when you add a precipitating agent to a solution it initially becomes superstaurated and you have to take measures to decrease this supersaturation. My question is why does it become supersaturated. Really having a hard time understanding this concept.

Homework Statement This is my equation. I needed to balance it in an acidic solution. H2O2(aq)---->H2O(l) Homework Equations I know that you should balance oxygen using H2O & hydrogen using H+. I am confused on how you balance the ionic charges. The Attempt at a Solution...

Hi I'm new to the forum, so first I want to say hello to everyone. I have been interested in Colloidal Silver lately, and I have produced it with electrolysis in distilled water with NaCl as an electrolyte. I have used a Silver electrode and cathode for both of these experiments. I...

Homework Statement Hi Lets say I heat 50g of water to 80°C. I take another 50g of room temperature water and put it in a bowl. Then I add this 50g of heat water to the bowl, the temperature in the bowl goes from 25°C to 48°C. What is the amount of heat absorbed by the room temperature...

Homework Statement The bromination of acetone is catalyzed by acid. CH3COCH3 + Br2 + H2O ------> CH3COCH2 + Br- + H3O+ The rate disappearance of bromine was measured for several different initial concentration of acetone, bromine and hydronium ion as represented in the following table...

Hi there, I would like to know that if we have an leaning object supported by another object, both are supported by ground floor to satisfy static equilibrium condition, does the reaction force at the contact point produce cancelling torque (for the leaning object)? In general, can a reaction...

We did an experiment in class today with Barium and sulfate. To one of the experiments we added a couple of drops of HNO3 to make it acidic and to the other one NaOH to make it alkaline. the barium and then sulfate The only one where they both reacted to make a precipitate were the acidic...

Hi, in nuclear reactors the water is heated while traveling through the core , now this heat comes from the nuclear reaction taking place in the core fuel assemblies, the part that I wnat to know is which of the elementary particles that come out of that reaction heat the water more and which...