Reaction Definition and 1000 Threads

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 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...

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...

1. Will the recorded temperature change for an exothermic reaction performed in a glass calorimeter be greater or less than that in a styrofoam coffee cup calorimeter? Assume glass to be a better conductor of heat than styrofoam. Please explain

I'm supposed to find out the temperature of a reaction at equilibrium. I've calculated K=0.187, ΔS0=940J, and I know that ΔG0=1134kJ and ΔH0=1414kJ. I'm supposed to use the R*T*ln(K)=ΔG0 formula, but my only problem is that ΔG0 is given for standard conditions,, ie where the temperature equals...

I can balance this equation using the half reaction method, but I want to learn to use the oxidation number method with this particular question to "broaden my abilities". Homework Statement ICl → Cl- + IO3 + I2 The Attempt at a Solution I: +1 → +6: lost 5e- I: +1 → 0: gained 1e- (I'm...

Homework Statement Find the total ionic (balanced) equation of the reaction of calcium hydroxide and phosphoric acid in aqueous solution. Homework Equations Solubility rules The Attempt at a Solution First, I balanced the reaction. 3Ca(OH)2 + 2H3PO4 --> Ca3(PO4)2 + 6H2O The...

Homework Statement The reaction between zinc and hydrochloric acid is carried out as a source of hydrogen gas in the laboratory: Zn(s)+2 HCl(aq)\rightarrow ZnCl_2(aq)+H_2(g) If 325 mL of hydrogen gas is collected over water at 25°C at a total pressure of 748 mm Hg, how many grams of Zn...

Hi everyone, I was just wondering how I would choose which species in an electrolytic cell to use as the cathode and which to use as the anode. For example, for aqueous aluminum chloride (inert electrodes), H2O (-0.83V) and H2O (+1.23V) will be used as the anode and cathode for the half...

Homework Statement Barium hydroxide is soluble in water. What are the spectator ions in the reaction of a dilute solution of barium hydroxide with hydro-sulfuric acid? Homework Equations The Attempt at a Solution The chemical equation is: Ba(OH)_{2(aq)}+H_{2}SO_{4(aq)}...

Homework Statement Two balls, one soaked in concentrated HCl and the other in NH4OH are placed at the left and right ends of a 1m long evacuated glass tube, respectively. HCl and ammonia vaporize and travel down the tube, reacting to form a white ring where they meet. Where does the ring form...

Homework Statement For the frame shown (see attached picture) , work out the horizontal reaction at B (ie find Bx)Homework Equations EQUILIBRIUM EQUATIONS: sum of moment = 0 (CCW is positive) sum of vertical forces = 0 (up is positive) sum of horizontal forces...

I have three questions about thermite. 1. Is hydrogen released when thermite is placed in water or is it just steam? 2. How can I separate the aluminum oxide from the iron after the reaction? 3. Can the aluminum oxide be split apart into oxygen and aluminum?Any knowledge would be greatly...

Homework Statement the only part of the question I am unsure about is finding the force of reaction as a function of time Homework Equations F=Ma F=-Kx The Attempt at a Solution F=Ma F=M(Dv/Dt) F Dt= M Dv i integrate force with respect to time from final time=t and...

Homework Statement I have two problems with this: 1) I am not sure if I am using the right constant. 2) I have no idea if my values are realistic. The actual question: The rate of a reaction is 25.00 units per time at 20.00°C. The activation energy barrier for this reaction is 1.50 eV. a)...

Homework Statement O hai, my minions. So...we made the xantoprotheic reaction in the lab, but I have to attach the representation of the reaction. I haven't found it anywhere. So I came to you. Homework Equations Protein + NaNO3→(180s@373K)→(room temp) + NaOH→ Weird yellow precipitate...

Homework Statement Note: the following question is from a recent biochemistry exam, for which the grades have been posted and the exam questions and answers have been made available to students. I asked my professor about the answer to this question, and when I explained the issue, we resolved...

Hi all, I'm looking for the energy required for a 2-step chemical reaction: CaSO4 + S2 -> CaS + 2SO2 CaS + 3CaSO4 -> 4CaO + 4SO2 This reaction is to happen around 1600 deg. F. I solved for the heat of reaction for these two reactions with the following enthalpy equation: H2=H1+∫CpdT I...

Hello, I'm trying to figure out how to calculate how much energy is being released in a nuclear fusion reaction from x rays. I think it will have to do with how much deuterium is in the vacuum chamber, how many volts I am using and the amount of resistance of the mesh the electricity is...

I need to find the product/s of a reaction, which has to be chosen from the list of compounds A - L. I thought the answer was only K but it seems to be wrong or that there is another product to add. (See the attachment). Thanks!