Reaction Definition and 1000 Threads

I'm struggling doing point 5, i have no idea how to solve that question. In point 1 i obtained the following result: ## I=\frac{ML^2}{2}## calculating the integral of dI, the infinitesimal moment of inertia of a small section of the rod of length dr. 2) Through the conservation of angular...

Conversion: 9.65 kg = 9650 g Mass Al = 26.98 g/mol Molar Mass Al2O3 = (2 x 26.98) + ( 3 x 16.00) = 101.96 g/mol Mol Al2O3 = 9650 g / 101.96 g/mol = 94.65 mol Mol Al Required = 94.65 mol x 2 = 189.3 mol Mass 100% Al required = 189.3 mol x 26.98 g/mol = 5.107x103 g Mass 80% Al required =...

hi, I was asked to balance this reaction : H3PO4(aq) + KMnO4(aq) + H2SO4(aq) → H3PO4(aq) + MnSO4(aq) + K2SO4(aq) + H2O(l) can I get some help? why we can't balance this reaction? and what can we say about a reaction that has the same compound as a reagent and a product? thank you

1a) Step 1: Balance the equation - S8 + O2 -> SO2 = S8 + 8O2 -> 8SO2 Conversion (t to g) 6.00 t = 6x10^6 g Molar mass SO2 = 23 + (2 x 16) = 64 g/mol 6x10^6 g / 64 g/mol = 9.375x10^4 mol SO2 reqired amount Sulphur = 9.375x10^4 mol / 8 mol = 1.172x10^4 mol S8 Molar mass S8 = (8 x 32)...

Summary:: We are given a description of a reaction and the masses of two reactants and are initially asked to calculate which of two is the excess reagent and how much of the excess reagent would be left over if we have 100% completion. Then we are given a final mass (after purification) of the...

Hello PF, I am building a traction assembly for a self balancing bot project and I am having some conflict with my intuition and practical testing results. The setup consists of a motor mounted to a chassis, the shaft coupled to a wheel that rests on a surface with non-zero friction. Below...

Summary:: In the question below, I've been asked to determine what happens to the reaction when the temperature is increased. I know the answer is a, but I'm having difficulty determining why. https://www.physicsforums.com/attachments/264126

A car and its load weighs 30kN and the center of gravity is 0.6 m from the ground and midway between the front and rear wheels which are 3m apart. The car is brought to rest from a speed of 50 kph in 5 sec by means of the brakes. Compute the reaction in the front wheel.

Wikipedia says this about the missing mass of a reaction: I wondered where such an expression is coming from? The invariant mass of a system ##M##, in natural units, satisfies $$M^2 = \left(\sum E \right)^2 - ||\sum \mathbf{p}||^2$$ If anything, then the "missing" mass (which they also...

I'm trying to simulate a simple series reaction stochastically using Gillespie's algorithm. I found this file: What is this 'propensity function'? Say for example I have the simple reactions: A --(k1)--> R R--(k2)--> S are these 'propensity functions' the rates (a wild guess)? I mean; α1 =...

Hello, I mixed these today: H3PO4 NaOH Tetrahydrofuran CH₂)₄O Cyklohexanon C6H10O 2-Butanon C4H8O It started to generate smoke. Just wondering if this gas might have been dangerous to breath in? theories? experiences? Thanks Stan

I know HNO2 favours diazotisation.So amine reacted and formed diazorised product with N+=NCl- which leaves and gives a carbocation to which OH- attacks.So according to me the answer should be cyclohexane-1,2-diol. But in the answer key,cyclopentane carboxyaldehyde was given as answer. I know it...

If you do the sum of vertical forces and sum of moments, you're always left with an unknown. Vertical Forces: Ray + Rby + Rcy = 59kN + 45kN (1) Sum of Moments about A: (59 x 1.85) - (Rby x 3.7) - (Rcy x 4.8) + (45 x 6.5) = 0...

The steps are as follows (apologies for my awful formatting, I'm not sure which Chemistry latex package there is!), $$(CH_3)_2CO \xrightarrow{HCN} (CH_3)_2C(OH)CN \xrightarrow{H_2SO_4} (CH_3)_2C(OH)COOH \xrightarrow{PCl_5} (CH_3)_2C(OH)COCl \xrightarrow{NH_3} (CH_3)_2C(OH)CONH_2$$ As far as I...

The definition of rigid body says it cannot be deformed (theoretically). Now, Newton’s third law is caused (I mean the reaction force is caused ) due to the deformation of the body. What I have learned is that every body is like a spring, when we push on it we compress it and hence feel a...

Hello all! I wrote a reaction mechanism for a sequence that forms an amide. Do you agree with my answer? Thanks for your help!

I started noticing some numbers next to each person's profile: Reaction Score and Points. I tried searching for the meaning of these values. Either it is hidden in plain sight, or I'm a bad searcher ?:) My guess is that Reaction Score has to do with the number of likes (or the other positive...

Hi guys, I am working on design where I am using a torsion spring. And I need make an analysis and see the deflection of the walls. How can I calculate the forces that applied from Spring's legs to walls. Thank you all in advance.

First time poster and also chemistry layman. I am starting on a new job building a carbon monoxide boiler in an oil refinery. As the construction contractor, we don't get into the operation/process of the equipment we build. I have found online that CO becomes combustible at around 1400F...

I researched the solar collectors implemented in practice for water detoxification and I found out that the preferred design is the Compound Parabolic Concentrator. Knowing that I have no information regarding radiation beyond what's taught generally in heat transfer courses in chemical...

So there's something I'm missing when I think of Newton's 3rd law of motion. If all forces between two objects exist in equal magnitude and opposite direction, how is it that, for example, when I'm driving my car, the car "runs through" all the air molecules, and they seemingly don't exert the...

after using the conservation of energy and momentum for a nuclear interaction i arrived to the following equation for the q factor as the book did , but can't get my head around deriving the second equation from the Q equation ? i will appreciate any help . thanks

Well, I considered the two wheels as two different bodies and I wrote Newton's equations for both of them I considered the wheel closer to the centre of the circle, we have: ##\mu N_1 =mR\dot (\theta)## So we can find ##N_1## Doing the same thing, we can find ##N_2## ##\mu N_2 =m(R+d)...

Hi, I have been stuck for hours, i do not understand how i am supposed to use bond energy values for this question like it asks when bond energy values are for molecules in the gas state. The first molecule reactant is a liquid and the second reactant has resonance. I have 0 idea how to approach...

Hi, I have a doubt about reaction forces... I've attached a picture that shows two similar situations. The first one shows a rod left with an angle ##\beta## while it is on a smooth surface. The second one shows a rod leaning on a smooth surface and wall. My question is: why is the reaction...

Summary:: I'm always unable to find the products of a chemical reaction. No Matter how much concept I study I can't ever get products from reasoning. Here is the question: What is the major product of this reaction? . OPTIONS : MY ATTEMPT : First of all I can see that in...

hello I am stuck on this question The decomposition of nitroglycerine is given by the following 2C3H5N3O9 = 6CO2 + 5H2O + 3N2 + 1/2O2 using the following heats of formation, determine the energy released in the decomposition of of nitroglycerine. heats of formation of CO2(g), and H2O(l)...

For (1), I got the correct answer which is 28.76kj/mol. For (2), the answer given is since Δ G > 0, the reaction proceed to left. I understand the meaning but what means by ' If reactants and products were mixed in their standard-state concentrations', is it indicate it is under standard state...

Hi I am trying to safely setup an experiment to measure a chemical reaction with a spectral detector. I was wondering how to setup the experiment safely in front of the spectral detector? Do I have to perform some calculations based on the chemical reaction beforehand? Or what? This is an...

I got 6.5 MeV but I don't understand how to determine whether the energy is released or absorbed. My guess: the energy is absorbed because mass defect of neon is bigger? Thanks

Hi to all, I whant to ask a question about theoretical chemistry. Let us consider a cyclic reaction ##\alpha A\rightarrow \beta B\rightarrow \gamma C\rightarrow \alpha A## where ##\alpha,\beta;\gamma## are the stochiometric coefficients and ##A,B,C## chemical molecules ... there are relations...

Summary: Hydrogen peroxide, H2O2, decomposes as per following reaction scheme: H2O2(l) → H2O(l) + O2(g) The concentration versus time data for the decomposition of hydrogen peroxide is given in Table 1. i) Calculate the reaction rate constant, k, graphically, with the aid of Excel software...

FeS2+Na2O2->Na2FeO4+Na2SO4+Na2O Fe2+ --->Fe+6+4e- 2S-1 --->2S+6+14e- 2O- + 2e- ---> 2O The first two have a total of 18 electrons so In order to balance the electrons i should multiply by 9 the third semireaction (2O- + 2e- ---> 2O-2)x9 now this 9 is going to multiply the left hand in...

Can fusion reaction propagate inside a (very thick walled) cappilary if fusion has been initiated at one end? In this situation it seems like all the energy would have nowhere to go but into heating and pressurizing the fuel, providing conditions for further reaction. I imagine this is a...

Hi all, Is this energy equation of any meaning if there is no chemical reaction $$\triangle G= RT ln \frac{C_1}{C_2}$$ in compartments with concentrations $$C_1 \ and \ C_2$$ Thanks.

According to me the option that is marked should be the answer because the oEt- will attack the carbon on the epoxide which forms the stable carbocation but in the answer key the answer is given to be d please tell me what i did wrong

So I was looking for some rate constants for a certain reaction and I found these: So I wanted to try them. The problem is, I have no idea how to correctly write the rate constants. Reactions number 1 to 6 is a no-brainer as it's simple Arrhenius. My problem is for rate constants 7 to 12. I...

Let R_{1} be the reaction force on the jumper from the ground. Assuming this is larger than the combined mass of the 3 sections of human, if we consider the entire system we will get an upward acceleration (a is labelled as the acceleration of the COM; it will of course vary from the bottom to...

As in the summary, my question is : has the actual yield of the above reaction being determined experimentally?Thanks.Adrian Tudini

CH3CH2COCl + CH3ONa = CH3CH2COOCH3 + NaCl ? from propanoyl chloride is formed acylium ion?

Given a balanced chemical equation, can we predict using computer models the maximum power of the chemical reaction? Thanks.

What is the definition of rate ##(-r_a)=-\frac{dCa}{dt}## or ##(-r_a)=-1/V\frac{dNa}{dt}## ? I think the general one is the second one and first one is for constant volume reaction system. Is the above written rate equation only valid to batch reactor? If not can we use this in a PFR or MFR? In...

A welded square frame consisting of four equal rods each with mass m and length 2l can move in the vertical plane by means of two small wheels in A and B that move without friction along a horizontal and vertical track, respectively. The disc is released from rest in a position where the sides...

Do action force and reaction force(Newton's third law) lie on same line?If not then the angular momentum will be violated.I don't know why a cat falling can rotate itself before contact land if the conservative law of angular momentum not be violated?

I have taught introductory general chemistry to engineering majors for over 30 years. Upon one occasion, a student told me "I sort of like the homework ... except the booger problems that I can't do." But it is exactly those problems, the more difficult type of problems, that give the student...

if the universe is expanding, what is the equal and opposite reaction to this action?

Hello! There is a problem to write chemical reactions that goes with substances if they are not stored properly. For example theophylline should be saved from light and though I am trying to find its’ reaction with hv(light) but failed. Please help with some good reference Many thanks in advance

This is the given reaction:https://www.physicsforums.com/attachments/1559750554233-png.244625/ Where will the reaction take place - at ketone or at alkene? And why?

Video Link According to the video in the link above the binding energy for deuterium is about 2 MeV and the binding energy for tritium is about 8 MeV so the total for the input items is 10 MeV the binding energy for helium is 28 MeV I am confused by this part if the resulting binding energy is...