Reaction Definition and 1000 Threads

Homework Statement 2HCl + Na2S2O3 -> 2NaCl +S + SO2 + H2O Find the order of reaction with respect to S2O32- and H+ volume of 3.0M HCl was held constant at 2ml Homework Equations S2O32- + 2H+ -> S + SO2 + H2O rate = k[Na2S2O3]m[HCl]n (see number 3.) The Attempt at a Solution i just...

Homework Statement When Fe(NO3)3 and KSCN reated, it immediatly turned red. my teacher says this si the stuff they use for fake blood in movies. My problem is, we must state the reaction type. Homework Equations the products, I am assuming, are FeSCN and KNO3 (i know I did not yet balance...

Does anyone know the experiment where distinct circular patterns appear to emerge in a liquid chemical reaction? This experiment was covered in my thermodynamics class due to its relevance of order emerging from chaos. All I remember about the experiment is that it was not believed at first for...

I accidentally threw dettol (chloroxylenol) down a clogged toilet drain without knowing there was already sodium hypochlorite there. For some strange reason, after flushing down once, it became even more clogged and it's still all lying there. I closed the door in fear of inhaling toxic fumes. I...

Just as the title says, I'm having difficulty understanding why the concentration of inert gas is not included in the reaction rate. I would think adding a higher concentration of N2 (or some other inert gas) would increase the reaction rate. Perhaps, I'm confusing reaction rate with space time?

Homework Statement For the reaction N2(g) + 3H2(g) <---> 2NH3(g) I am supposed to determine the equilibrium constant at 298K and 1 bar. We have been given a table that states that for NH3(g): \Delta_{r}G^{\Theta}= -16.45 kJ/mol I know that \Delta_{r}G^{\Theta}= \Sigma v...

http://en.wikipedia.org/wiki/Standard_enthalpy_of_reaction" of reactants (ΔHfO). My question is, why? And I also know that I can find http://en.wikipedia.org/wiki/Standard_enthalpy_of_reaction" (ΔHrO) by subtracting the bond energies of the reactants from the products. The result differs...

My friend said that two horses pull the Magdeburg hemispheres with same force is as same as a horse pulls the Magdeburg hemispheres which is tell on a tree(I may forget the details about the assumption) Why? Another Q. about action and reaction i don't know why the reading isn't 2Mg,but is...

The purpose of this chemistry lab was to prepare/synthesize Bis(2,4-pentanedionato) Copper (II), which is also known as Cu(C5H7O2)2 I was given the following format for a chemical equation in a lab that needs to be balanced: Cu2+ (aq) + 2 base-n (aq) + 2 C5H8O2 (aq) → Cu(C5H7O2)2 (s) + 2...

Homework Statement I want to find a relationship between the number of moles of O2 used and the number of CH2 units in an alkane in a complete combustion reaction. Homework Equations The Attempt at a Solution Right now I have come up with a math equation, given X units of CH2...

Okay, so we did a lab in class with Na2CO3 in BaCl2 first. The reaction formed a white precipitate, and I suppose the products are BaCO3 + 2NaCl. Not sure if NaCl is dissolved or not, or if it was the white precipitate I saw, but anyways, here's my question... We added HNO3 to that new...

Critical mass is over 50kg so let's say I have 2 halves of a sphere of the isotope U-235, each weighing 30 kg. I drop one onto the other so that they form a supercritical sphere. No doubt a chain reaction would begin, but I assume it would produce energy on the level of a nuclear reactor rather...

Homework Statement Calculate the heat of reaction per mole of water formed in the acid-base reaction. Assume that the total mass of the solution is 150g. 75mL of 2.0M NaOH added to 75mL of 2.0M HCl in a styrofoam cup. Average initial temp = 295.65K. final temp = 308.8K Homework...

Hi guys, I'm facing a problem. I've read a paper where they tried to synthesise a crystal and they give the following reaction mixture molar composition: 3.0 SiO2 1.0 Al2O3 0.1 NaCl 276 H2O What does it means? It can't be the molar fraction since the sum of all the fraction must give 1 as...

um, i placed my elbow on the table, and i think i mustve hit some ideal spot that actually caused a (static?) reaction up my lower arm. what i want to know is, what exactly it is, why did it happen, and why it only happens sometimes?

PER - chemical reaction Q: A reactor is needed to convert A to R in a liquid reaction. The stoichiomentry is simply A→R and the rate data is given in the table below (P5.21, Levenspiel 1999). For the reactant concentration to drop from CA0 = 1.3 mol/L to CAf =0.3 mol/L, determine, a)...

Is this nuclear reaction exothermic or endothermic?? Homework Statement Is this nuclear reaction exothermic or endothermic?? alpha particle + beryllium -> carbon12 + neutron Homework Equations The Attempt at a Solution Im not quiet sure which one it is, I don't know what...

Well this is something that has been aggravating me since I did the experiment at school and really just want to solve and not have it happen again. My problem is while mixing varying mL of NaOH and HCl we (my group and me) were supposed to record the varying changes in temperature for the...

Homework Statement Balance PbO2(s) + Cl(-) → PbCl2(s) + O2(g) Homework Equations n/a The Attempt at a Solution Pb(4+) + 2e(-) → Pb(2+) and I'm stuck because there's no 2nd reaction.

Homework Statement http://www.mrev.org.uk/A-Level_Site/New%20A-Level%20Unit%204/Rates.html (the answers are at the top - see link) Could someone please help me with the question (about half way through) on ethyl ethanoate and sodium hydroxide. in cii) we identified the half life doubles...

I am supposed to balance the following reaction: CdS + HNO3 (dil) → Cd(NO3)2 + NO + S + H2O After writing out all the oxidation numbers for each atom, I found that Cd and N are both reduced (Cd5+ → Cd 1+ and N5+ → N2+). I am wondering how to approach this problem. Is it possible to have 2...

tert-butyl bromide reacts with HOH to give HBr and the corresponding alcohol , C C-C-C OH But tert-butyl alcohol reacts with HCl to give tert-butyl chloride. HBr is a "stronger" acid than HCl. Is this part of the explanation of the different reactions?

Homework Statement What is the equation for the reaction of a alpha particle and beryllium with production of one neutron Homework Equations Use an a chem equation The Attempt at a Solution The masses are 4 + 9 = 1 + x, so x = 12. The atomic numbers (protons) are 2 + 4 = 0 + x...

I was given 2Na + 2H2O → 2NaOH + H2 My only question here is whether the Na on the reactants side is 0 because it is alone? And is it the same thing for the H2 that is alone on the products side? So if were the case Na would oxidize and H would reduce?

Homework Statement The concentration of the reactant A has been studied as a function of time. By a suitable plot of the data below, show that the reaction is first order, and determine the rate constant, k, and the half-life, t1/2. Use the integrated rate equation to determine [A] when t =...

What exactly is a double displacement reaction? I searched my textbook for the term--yes, I did check the glossary first--and it proved futile. My teacher alludes to this term and even has one power point slide to it. It says, "When an aqueous solution of sodium carbonate is added to an aqueous...

Please teach me this: What prevent the reaction changing leptons to hadrons and vice versa?.Because both leptons and hadrons are ruled by electro-weak interaction,so why the reaction can not happen? Thank you very much in advance.

1. It has been found by experiment that the molar mass of the Rn nucleotide is 221.9703 g and that of the Po nucleotide is 217.9630 g. The molar mass of helium is 4.00150 g. Given this information, and the information from the class, calculate the energy evolved, in kJ, for the following nuclear...

What is the reaction force for a tension force. For example someone pulling a brick by a rope.

Homework Statement For each reaction, give balanced chemical equations or NR (no reaction) and rationalize your answers in terms of trends in oxidation states. Calculate net potential for the reactions: a) Fe2+(aq) + Co3+ (aq) (acidic conditions) →b) CrO42−(aq) + MoO2(s) + H+ (acidic...

is it possible to have a triple replacement type reaction? I know of single and double replacement but what if you mix sodium carbonate, magnesium hydroxide, and potassium sulfate all together (this is all made up just for an example). would all the different ions mix to form all possible...

I thought I understood it cause I always had the right answer ever since I learned about it. But now my friend asked me a question about why does a piece of chalk break if you put a heavy thing on it, say a car. If we just think about action and reaction, the forces have to be along a...

Homework Statement See attachment there is reaction.why --OH attach to 2nd carbon. why not it attach first carbon(from left). Homework Equations steric hindrance The Attempt at a Solution there seems greater steric hindrance in right carbon(2nd from left) than left one.

Homework Statement Human reaction times is sometimes worsened by alcohol. How much farther would a drunk driver's car travel before he hits the breaks than a sober drivers car? assume both cars are initially traveling 49 mi/h the sober driver takes .33s to hit the brakes and the drunk driver...

This is the link for the assignment: http://imageshack.us/f/840/assignmentsynthesisofev.jpg/ Homework Statement Given in the link Homework Equations Why would the proposed synthesis be successful if the reaction stopped after 2 hrs? How does H attack compound 2 to create compound...

First of all, I'm asking here for advice since I've seen how the members of this forum answer in a mature manner (I've read some problems like mine in the forum, however, I've not contributed some). your advice is very much appreciated (please don't mind the different field of study) I've...

Suppose you have a reaction wheel or a control moment gyroscope on your spacecraft for attitude control. This would be a self contained unit, with 3-axis control. Either device utilizes the conservation of angular momentum, trading angular momentum between the unit and the spaceship frame as...

hi, The drawing show 2 transformers T1 and T2. Each primary of transformer is at fixed voltage (110 volt for example), but one transformer is with 0° phase and other with 180° phase. The secondary of each transformer has the same charge and the same current. The idea is to cancel the flux from...

consider 3A + 5B ----> 4C + 2D if this is an elementary process the rate of reaction is given as r = k [A]3 [ B ]5 , where k is rate constant, [x] are concentrations so my question is , why is the rate of production of A = 3 times the rate of reaction? since the rate of reaction has...

Homework Statement I am reacting methyl salicylate with sodium hydroxide to produce salicylic acid. However, first it is important to add acid to neutralize the very basic solution. My question is, when determining the amount of HCl to add, do I need to take into consideration the methyl...

Does sodium reacting with water produces sodium hydroxide directly or produces sodium oxide first then hydroxide ?

A 9g sample of solid NH4Cl is heated in a 4L container to 924.4oC and decomposes according to the following equation. NH4Cl(s) -> HCl(g) + NH3(g) at equalibrium the partial pressure of NH3 (g) is 1.346 atm. Calculate the equilibrium constant for Kp for this reaction Homework Equations...

Please help Due in 2 hours. Statics machine equilibrium: reactions- too many unknowns Homework Statement The woman using the lat pulldown machine is holding the 80-lb weight stationary in the position shown. What are the reactions at the built-in support E and pin support F? (A and C are...

Latley, I have been trying to conduct an experiment dealing with Potassium Carbonate and water. But first I need to get everything down on paper. So, what is the reaction between water that is 145 degrees and 30 grams of Potassium Carbonate? Would it help if I put the PC in the water and then...

A chemical Reaction A-->B is carried out in a closed vessel. The following data are taken for the concentration of A, Ca (g/L), as a function of time, t(min), from the start of the reaction. A proposed reaction mechanism predicts that Ca and t should be related by the expression ln...

Two lightweight metal spheres are suspended near each other from insulated string. One sphere has no net charge, the other has a net charge. The spheres will? Homework Equations None The Attempt at a Solution I know opposite charges attract and similar charges repel, but not sure...

This question is about momentum in a system when an electron and positron annihilate each other. Consider the following, please: SITUATION Consider a system of 3 particles. They are in motion (which I will explain with Earth as the geometric frame). The electron (#1) is moving, coming from...

Homework Statement Histidine is an amino acid. It is not soluble in water but it will dissolve in water when dilute sodium hydroxide is added. The question has two parts to it: part-a) Write an equation for the reaction that occurs between histidine and dilute sodium hydroxide...

I'm in my 3rd year of a chemistry course so its fairly ridiculous that I can't balance equations. I can balance simple equations in my head in seconds but what I need is an algorithm that I can use to balance any equation I will ever encounter. Can any of you teach me a method for balancing...

Homework Statement Basically I have to show the product of this reaction: Homework Equations Grignard reaction mechanism: The conversion of a ketone to an alcohol The Attempt at a Solution My attempt of this reaction produces an alcohol with two ethyl groups attached to...