Reaction Definition and 1000 Threads

Homework Statement Give two advantageous reasons for using bulky borane (9BBN) for hydroboration of alkynes. Homework EquationsThe Attempt at a Solution I'm thinking it might have to do with the size of alkynes and bulky reagents, but I'm really not sure.

Homework Statement Determine the components of the forces acting on each member of the pin-connected frame shown. (the frame shown is drawn as a free-body diagram in the image provided below (the top-most portion) and is correct) Homework Equations Equilibrium equations: ∑M=0 ∑Fx=0 ∑Fy=0 The...

Homework Statement Lets say i have a structure like this , at A and B are fixed support ( it resists moment about , force in x and y direction) I want to find the moment about the A , should I include the MA as well in my calculation or no ? Homework EquationsThe Attempt at a Solution moment...

Homework Statement I'm asked to find the W and I was told that the rope at C is in tension , there is reaction at B , my question is , is there any reaction at C ? Homework EquationsThe Attempt at a Solution

Homework Statement Balance the following oxidation-reduction reactions: PbO2 = Pb 2+ + O2 Homework Equations [/B] These are the steps I'm supposed to follow. 1. Determine the valence number (charge) for all the elements involved in the reaction. 2. Determine the number of e- given off...

.. reaction. This may seem a nonsensicle question but I'll go ahead anyway. Say if I have a process that has an emission spectra dominated by excited state molecular emission, can I relate this in any way to the amount / number of chemical reactions occurring? Thanks for any help

Homework Statement What is the major product of the following reaction? (Its CHCl3) Homework Equations Reimer Tieman reaction The Attempt at a Solution This reaction looks like the Riemer-Tiemann reaction. The only difference is the reactant. First step is the formation of carbene. Then...

Homework Statement What number of electrons to balance the equation ##I_2(s)+OH^-(aq)\rightarrow IO_3^-(aq)+H_2O(l)## The Attempt at a Solution I see that the oxidation state of I increases from 0 to +5 But, I don't see any reduction at the reaction.. So, I don't understand how to balance the...

a certain fission reaction releases 3 neutrons. how many of these neutrons must go on to produce a subsequent fission if a chain reaction is to be sustained?

The classical problem of radiation reaction classical electrodynamics seems to be a huge mess with no good answer. There is no even consensus of the very form of the Newton law "predicted" theory. So, the question of this thread is: Does the classical limit of QED say something about this...

Let's say Bob floats in space. Bob's identical twin Joe moves past Bob at relativistic speed. As Joe is passing by, Bob gives him more speed by pushing him with his hand. Somehow I just happen to know that Joe will feel a smaller force pushing him than what Bob feels. So my question is: Why is...

Hello, "Reversible processes are at equilibrium : Driving force is only infinitesimally greater than the opposing force Process occurs in a series of infinitesimal steps, and at each step the system in at equilibrium with the surroundings It would take an infinite amount of time to carry out...

Homework Statement Are endergonic reactions and endothermic reactions the same thing? Homework Equations N/A The Attempt at a Solution N/A

Hello, Inside an ideal battery, the chemical reaction is reversible (at equilibrium), thus the oxydation-reduction reaction Zn + Cu2+ = Zn2+ + Cu is happening in both ways at the same rate right? Now, for a real battery, there's resistivity inside it due to many factors, thus the chemical...

*Note: Even for 1 answer for any of the question, I am highly appreciate it. I am understand it quite a burden to answer all. Thank you. Hi guys, I am currently seeking a correct approach of getting the reaction force developed on bolt due to the Forward or Upward force experience by the...

Homework Statement [/B] NH3(aq) is a weak base with Kb = 1.8*10-5, Calculate [OH-] in a solution that is made by mixing togeather 500ml of 0.20M NH3(aq) and 500ml of 0.20M NH4CL(aq), what is the value of Ph?Homework Equations Henderson Hasselbalch: ph = Pka + log([conj.base/acid]) As well as...

CH3Cl +AgF :CH3F +AgCl Guys if I'm correct this is a nucleophilic substitution reaction and here I'm not getting the reaction because from my view chlorine atom is more nucleophilic than fluorine atom and carbon atom is more electronegative than silver atom so how the reaction is taking place?

Hi, I am working my way through the answers to the question sheet but am confused: 1. Homework Statement Homework Equations none The Attempt at a Solution Why isn't NO2 a reaction intermediate? i.e. I thought that if when the equations were added, the ones that cancel are the reaction...

Homework Statement Hi there. My question is more for clarification than a homework question. In my studies, I noticed that my MCAT study manual provides problems relating reaction rates and the effect that temperature and thermal energy have on a reaction. For example, a question asks: in an...

Homework Statement Homework Equations In static equilibrium the forces are = 0 Method of Joints The Attempt at a Solution i don't know how to find the reaction forces of A and B. i know how to calculate the force of each member by working backwards from where F is applied but once I do...

during my reading of ender's game, there was a device that could split molecules and cause a chain reaction of destruction. this seems possible yet impossible to me. can such a weapon be created and if so what causes the reaction to be so destructive.

I recently came across a lot of problems where components of Hinge Reaction were asked along different axis . What is hinge reaction ? How do i calculate it ? How do i find its direction ? Does it change angular velocity / acceleration of the body ?Sample Question ) A square lamina of side...

I found an article, titled Electromagnetic Decay of the Σ0(1385) to Λγ , in the arXiv telling that the reaction Σ0→Λ+γ can happen through electromagnetic interaction. However, if I examine the conservation of parity. Parity on the left side is even(P(Σ0)=+), but that on the right side is...

Using a more physics oriented approach, rather than a chemistry one, and looking to an energy point of view if possible. For example, why when ice turns into water there is a need for energy (heat)? I know in some extent that the energy is used into re-organizing the chemical bonds, but that...

Consider the following chemical equation: 2IO3-+wH2O2+xH+=>I2+yO2+zH2O Which of the following is the correct combination of the reaction coefficient y and z? A) 4&5 B) 5&4 C) 5&6 D) 6&5 How to obtain the answer? Thank you~

Homework Statement There's no problem statement, I'm doing this as part of my project For degradation of food wastes to methane, the general formula is given for food waste (without sulfur) ##C_{n}H_{a}O_{b}N_{c} + (n - \frac {a}{4} - \frac {b}{2} + \frac {3c}{4})H_{2}O \rightarrow (\frac...

Homework Statement The E° value of one cell reaction is positive and that of another cell reaction is negative. Which cell reaction will proceed toward the formation of more products at equilibrium? *Problem 19.20, Chemistry: Chang, Raymond. 10th ed. Homework Equations E° cell = E° cathode -...

This is the question: http://i.imgur.com/Ex2Yx4l.png I have calculated all the angles in the frame, and have drawn line of forces so that the reaction force at x, reaction force at y, and the 10KN meet up. From then I am stuck, and don't know how to find the angle theta...

Example, I have a mixture of 5 grams of oxygen and 10 grams of hydrogen. I ignite them. How much force will the explosion do? Yes, I did think about posting this in the chem category but this is about forces, right?

Homework Statement [/B] I don' t want to be too specific, but it's basically "A + B -> C has the rate law Rate=k[A][ B], How long does it take [A] to reach concentration X. K is given and the initial concentrations of A and B are given." Homework Equations The integrated rate laws, whether I...

1. Homework Statement Homework EquationsThe Attempt at a Solution I chose B, because I thought adding more OH- would cause the reaction to shift to the left, and a low temperature would slow the rate of reaction, but the answer is A, why pH 7?

Homework Statement There is a bloc B that is on a surface S. A bloc A is on on the bloc B. We pull the rope towards the right. There is friction between all surfaces and the blocs stay stationary (They don't move). Identify all the forces which are applied on the bloc B...

Hello all, I am in the process of calculating reaction forces on an object, and need some help. Attached is a free body diagram of an object in two different views- one looking from the sides (z-x plane) and one looking it in birds eye view. (xy plane) 7 variables I am looking to solve are...

Homework Statement why the reaction of pin is only acted towards the pin ( the horizontal of reaction of the force is directed to the left , whereas the the vertical component is acted upwards ) , why can't the horizontal of reaction of the force is directed to the right , whereas the the...

Homework Statement for no 4 , why the reaction force also act downwards ? as far as i know roller can only support the surface perpendicular to it upwards ... but not downwards... for no 5 , why the recation force acts upward only ? why not also downards?Homework EquationsThe Attempt at a Solution

Hello, I'm working on modeling a biological reaction with SuperPro. Right now, all I know about the reaction is the conversion. I don't have data on the stoichiometry, and I don't even think the stoichiometry of the reaction is known. Any idea how I might be able to model this kind of reaction...

Hi all, my first post on here and just wanted to check something I'm working on for a project. The project is to use a pump to create a jet of water to manouvre small boat. I have found a formula to work out the jet reaction force in a fire fighting textbook which gives: R = 0.157 * P * d^2...

Homework Statement why the recation of the force is acted to the right ? why not to the left ? how to determine it ? Homework EquationsThe Attempt at a Solution

A shaft of diameter 10 inch is supported by 3 ball bearings. An external force (F, given) from pulley (diameter not given) also acts on the shaft. The supports are subjected to bending load (moment and transverse shear) and torsion load due to pulley. Yield Stress at Tension given. Assume no...

Gas stove with 16000 btu output and cast iron grate (non coated)---using an old aluminum pot (non anodized, etc). The grate has changed from black (no apparent rust) to a light gray color. Was there some type of low grade thermite reaction here?? Any comments or thoughts on this? Thanx

< Mentor Note -- thread moved to HH from the technical forums, so no HH Template is shown > experiment for testing type of catalyst on reaction rate? I need an experiment (just the method) Where I can test the reaction rate of changing the catalyst type I need about 3 differnet catalysts e.g...

I want to compute the polarized cross-section of $$ {e^{-}e^{+}\rightarrow W^{-}W^{+}} $$ but this reaction is chiral and only 2 input helicities are allowed while 9 out put combinations of W-boson helicities/polarization are possible. W(+-0) & W(+-0) are the possible polarization of W-bosons...

Why the reaction between alkali metals and water exothermic?? I know that it produces heat to surroundings But, what actually happens?? Why it gives heat to surroundings?? http://antoine.frostburg.edu/chem/senese/101/thermo/faq/exothermic-endothermic-examples.shtml says that when forming ion...

Homework Statement I am given the forces on picture and I´m asked to find the reactions on both supports. I see they are pin supports so they ask me for 4 unknowns. Homework Equations Sum of forces in both directions equal to zero Sum of torques wrt a convenient point equal to zero THREE...

Its given in my book that Sulphuric acid displaces more volatile acid from Metal salts like NaCl. That is, NaCl + H2SO4→ HCl + Na2SO4 What does valtility have to do with such reactions? Or Should I just accept it as a fact?

Dear PF Forum, First of all, I'd like to thanks PF Forum for giving me invaluable answers all this time. Now, I have a "situation" here. My church wants to conserve environment by changing cooking oil into biodiesel from its parishioners I'd like to know how effective this effort is. I have...

Homework Statement The diagram shows the instant when a long slender bar of mass 4.9 kg and length 4.9 m is horizontal. At this instant the mass m= 6.5 kg has a vertical velocity of 4.0 m/s. If the pulley has negligible mass and all friction effects may be ignored, what is the magnitude of the...

Is there any relationship between processing speed and reaction time (speed at which something reacts to external stimuli) of information processors such as the brain and computers? So if a computer had higher processing speed, would it be able to react quicker to external stimuli, For...

OK, so I saw a video of someone doing the water to wine trick and just had to learn it. There are apparently a few different ways that this can be done,...but settled on this version: http://imaginationstationtoledo.org/content/2010/11/water-to-wine/ It's absolutely great, but for some reason...

Good evening, people of PF. Recently, while studying chemical kinetics, I have come across some questions about reaction rates and rate equations. I've noticed some inconsistencies between the chemical kinetics point of view, and the approach taken by chemical reaction engineering and reactor...