Reaction Definition and 1000 Threads

Homework Statement Which of the following CAN be made as a pure substance? Choices are a list of molecular salts. Homework Equations According to my teacher the salt cannot be made as a pure substance if the components undergo a large extent acid-base reaction. The correct choice was...

Hello! What would be the substance, chemical reaction and technique, to have the highest rate of immediate mass change, back and forth, from low to high and back to low again, as many times as needed - using only homemade DIY, non dangerous materials and equipment? My intentions are to...

Homework Statement This is not a homework question, rather, I am just trying to clarify a concept and example in my textbook. Ammonia is produced by the reaction of Nitrogen (N2) with hydrogen (H2) as shown in this equation. N2 + 3 H2 --> 2 NH3 The rate of ammonia production is 5.0 x 10-6...

This question relates to rate constants of transition events. The transmission coefficient κ reduces the value of the rate constant compared to the transition state theory (TST) value. I understand κ to be defined as the probability that a reaction coordinate q will proceed to product given that...

I'm wondering what happens in a single displacement reaction if the displacing metal (the one that's going into the solution) reaches it's solubility limit before the other metal in the solution is fully displaced. Say for example you had a strong silver nitrate solution, and you placed enough...

Homework Statement Please see attached for problem statement and table of bond energies. My chemistry background is awful and this is from a materials science textbook. The question is, how would I approach/solve 2.31 (only parts b and c).Homework Equations The Attempt at a Solution We go from...

1) Is armature reaction seen in all machines ie DC, INDUCTION & SYNCHRONOUS machines ? (just answer briefly, which all machines exhibit it) 2) Is back emf in DC motor nothing but LENZ'S law, or is the generating action in DC motor called the LENZ's law, or are both same, and I'm confused ...

suppose you have 2 litres of pure hcl in a solution of 4 litres of radioactive h2o , so the concentration of HCl is 1/3 of the whole solution , now suppose you neutralized that solution with Sodium hydroxide , what happens to the radioactive solvent ? is it involved in the reaction ? does its...

what types of chemical reaction does not have oxdiztion and reduction...

Hi, I need help determining which of the statements are true and false. http://imgur.com/9BC1Wqf I know this involves steady state approximation, but I find that when I try it I am never able to rid of all the intermediates. Please help Thanks

Homework Statement Nitrous oxide reacts with ozone to form dinitrogen pentoxide. There are four moles of each reactant and the volume of the container in which this reaction takes place is 2 L. T is constant. The equilibrium constant for this reaction is 1. How many moles of product are...

Can anyone please walk me through the mechanism as this question does not make sense to me. I do have some understanding of the general mechanism. The answer is B) but I don't understand how to get there. The confusing aspect to me, is the structure of the ylide.

Homework Statement Reaction: 2A --> C Step 1: A <-> M (fast) Step 2: M + A -> C (slow) What is the observed rate law? Homework Equations Rate = k[A][B][...] The Attempt at a Solution The observed rate law seems to be k[A]^2. However, why is it so? Why does the rate...

Homework Statement When sodium is dropped into water, aqueous sodium hydroxide and hydrogen gas are produced. Which of the following are correct regarding this reaction? 1) Sodium metal is the reducing agent. 2) There are no spectator ions. 3) In the balanced net ionic equation, all...

As i was passing reading tetanus and its causating bacterium ,pathogenesis, ,clinical manisfestations, i found that it is present as spores in soil and gains entry in body through wounds (except in neonatal tetanus ), germinates and then starts secreting toxin tetanospasmin leading to...

Hello everyone! I have a question: Let's say we have a 6g sample of a compound that has C, H and O. This sample is burned with excess oxygen. I want to know if it is possible to recover the mass of O in the original compound from the mass of H2O and CO2 that will be produced (from...

Homework Statement Hello all, I'm currently in high school and I'm doing a biology experiment with catalase reacting with hydrogen peroxide. I have measured the total amount of gas produced in terms of mL during the reaction which took place over 30 seconds. Throughout the experiment I'm...

Homework Statement Examkrackers Lecture question - MCAT Prep book 116. A student holds a beaker of pure liquid A in one hand and pure liquid B in the other. Liquid A has a higher boiling point than liquid B. When the student pours a small amount of liquid B into liquid A, the temperature of...

Dear Forum : I'm reading a cross section data of 20MeV proton + 16O reaction from ICRU 63. ( as attachment and link http://ppt.cc/qf-9 ) The total cross setion of (p,n) reaction is 4.372mb However, the cross section of emitting neutron of energy between 0 to 1.5MeV is 0.91 mb / MeV. The...

Homework Statement a uniform rod of mass m and length L is free to rotate in the vertical plane about a horizontal axis passing through its end. the rod is released from rest in the position shown by slightly displacing it clockwise. Find the hinge reaction at the axis of rotation at the...

I wanted to make strontium acetate but it didn't get hot (like when I mix calcium hydroxide with acetic acid). Does that mean it didn't work?

The binding energy (BE) per nucleon for 235U is 7.6 Mev. The 235U undergoes a nuclear fission to produce two fragments both having a BE of 8.5Mev. What is the energy released from a complete fission of 1kg of 235U (joules)? Here I assumed that it breaks into two 118X element. Therefore...

Say we are running a chemical reaction of some kind, in liquid, in a round bottom flask. We have a solvent, two reactants, a product, and the reaction is under stirring, reflux (volume maintained) and constant temperature. In my mind, if we simply double the volume of all the reactants...

I would like to know how it is possible that I can be at rest on the surface of the Earth (relative the the Earth of course). My main cause for confusion is the action reaction pair that occurs when I stand on the surface of any solid material. The normal reaction nornal reaction a-r pair...

Why does a higher activation energy usually mean a slower reaction? Doesn't activation energy just tell us whether or not a reaction will take place or not based on if the particles have enough energy to meet the activation barrier? How is it related to the rate of the reaction?

Sir, i desperately want to know a reaction in which the resulting product has more density than the reactants and which can be reversed easily (prectically) with minimal or no loss of energy.Please reply.Thanks..

Homework Statement NH3 + O2 --> NO + H2O Enthalpies of formation NO: 91.3 kJ H2O: -241.8 kJ NH3: -45.9 kJ Homework Equations delta h = sum*moles enthalpy of formation of products - sum*moles enthalpy of formation of reactants The Attempt at a Solution = [(1)(91.3) +...

Hello, is there a way to eliminate the possibility of a reaction having one single step? For example, the reaction NO_2(g) + CO(g) \to NO(g) + CO_2 (g) appears to me to be single stepped, but my textbook gives the reaction in multiple steps and does not elaborate on how the individual steps...

Referring to a DC generator: one way to counter armature reaction is to shift the brushes. But I don't get how it works. The direction of armature flux also changes when the brushes are shifted, so why does the MNA (magnetic neutral axis) not also rotate further.. If it does rotate further...

Hello I'm not sure if this belongs in this forum or the homework forum, but I have a quick question about selectivity and yield in reactions where one product is made, and that product returns to one of the reactants to create another separate reaction. for example: C_{6}H_{12} + H_{2}O...

Hello, I have a question: Why potassium permanganate reacts with grycerolem as it reacts? Spontaneous combustion, the violet flame ... I found only a complicated explanation. Please, can you explain it to me simply? Thank you!

Homework Statement Homework Equations The Attempt at a Solution For this problem, what I am confused about is the fact that the Z direction parts of the tension will tend to rotate in a direction different from the Y components of the tension and the 850 lb vertical force. I am not sure how to...

Homework Statement Problem 12.20 Homework Equations The Attempt at a Solution For this problem, I am having a hard time getting any values for the streams, so I am stuck at stream G and K and can't figure out how much is going into G since I don't know the liquid recycle stream. I...

Hi there, I am trying to understand the physics acting on a discus thrower, namely at their feet when they throw a discuss. first the player spins to pick up momentum for the discus, he or she does this by pushing on the ground but when the actual discus leaves the hand, is there an action...

I'm doing an essay on imobilized enzymes. I need to evaluate some data i collected, to do that i need a graph that can relate effectiveness and Thiele's Modulus. My problem is that the only graph that i could find was this one: http://imgur.com/aykaMvU As you can see there's no graduation on...

I was just wondering if anyone has some redox reaction formulas or corrosion formulas? Cheers Darryl

I am not able to understand reaction of magnetic force and how it is equal to qvb ?

Homework Statement "Estimate the standard reaction Gibbs energy of the following reaction: N2 + 3 H2 ‒‒> 2 NH3 at 100K and at 1000K." Homework Equations ΔS(T2) = S°(T1) + ∫ n Cp dT/T ΔG = ΔH ‒ TΔS Given data: http://imgur.com/MBakUEB (may need to right-click and select...

I am confused as to why the following happens: K_2O + H_2O\rightarrow 2KOH^- Does the potassium hydroxide no longer react with the water? Why exactly is this a base? How does the potassium end up bonding with hydroxide?

Homework Statement Consider the following sequence of reactions occurring in the acid medium. All emf (standard) are measured at ##25^{\circ} C## and expressed in volt unit: $$MnO_4^-\stackrel{0.564}{\rightarrow}MnO_4^{2-}\stackrel{2.26}{\rightarrow}MnO_2\stackrel{0.95}{\rightarrow}Mn^{3+}...

Homework Statement A bowling ball is suspended from a ceiling hook using a thin piece of rope. If the rope is exerting a 65 N force upward on the ball, describe the corresponding reaction force in terms of: (a) its magnitude (b) its direction (c) on what object it is exerted (d)...

So let`s say that we have a chemical reaction with liquid oxygen and liquid hydrogen, but we`ve got very little hydrogen, and very much oxygen. As we pour these two liquids together they react with on another and create water. However since there was a very much bigger amount of oxygen than...

Cu(NO3)2(aq) + 2 NaOH(aq) → Cu(OH)2(s) + 2 NaNO3(aq) This is a chemical reaction I'll be doing soon for my chemistry lab. And I was wondering, since the product is blue, and as is the reactant, how can I tell I've used up all the cupric nitrate and it has all reacted? Note: and the NaNO3...

Can't figure this one out. Here's the problem. Solid molybdenum (VI) oxide reacts with gaseous xenon difluoride to form liquid molybdenum(VI) fluoride, xenon gas, and oxygen gas. Write the Qc for this reaction. I know Qc is products over reactants and pure liquids and solids are not...

Homework Statement what is the mass of alum that can be prepared from 1.340g of Al. Homework Equations 2Al+2KOH+4H2SO4+22H2O ---> 3H2 + 2KAl(SO4)2 * 12H2O The Attempt at a Solution given Al is the limiting reagent. Find the moles of Al using n=m/M I find Al moles to be...

A high energy proton can collide with a photon to produce a charged pion and a neutron. If the photon comes from the cosmic microwave background and has an energy equivalent to a temperature of 3 K, what is the minimum energy of the proton in eV necessary to allow this reaction? I'm thinking...

My problem here seems that I can't figure out how to solve for my unknowns. I have 3 equations for force, and I'm not sure if that equation I have for the moment around the origin counts as 3 new independent equations if I split them up into i, j, and k components. If that is allowed, then I...

Homework Statement Problem 4.36 http://xps2pdf.co.uk/4c82ad8dcb91d5507169e0a18804ea30bf81d592/4.36.pdf Homework Equations The Attempt at a Solution I am not sure if I am doing this correctly..there is a lot of information that I am not using to solve the problem (i.e. all the different...

Hello guys, The title might be slightly misleading, it's not related to general physics. It's a hypothetical question that's far from being realistic of practical; Suppose you have a very very long bar, and suppose it's layed on a type of material with no friction, a person stands at the 1st...

Hi! In most textbooks on chemical physics/thermodymanics it is said that under fixed pressure the heat of reaction equals change of enthalpy of the system since dU = \delta Q - p\cdot dV, and hence d(U+pV) = \delta Q. But my question is: why they do not write a term +\mu\cdot dN which describes...