Reaction Definition and 1000 Threads

Why is the normal reaction of an object circulating a planet, equals to the gravitational force minus the centripetal force? I thought both gravitational force and centripetal force are directed towards the centre of the circular path i.e. in the same direction, therefore having, normal reaction...

I have a question, What happen you Ignite hydrogen and oxygen in very strong metal close chamber Will it explode to break the chamber?

In synchronous generator, how does armature reaction cause a 'drop' ? How is it different from the leakage reactance of stator windings? I can't visualize it..Please help..

As per control theory, if a bounded input produces a bounded output then a system can be said to be stable. So assuming that I press my cars gas pedal such that it reaches a fixed position, then the reaction of my car would be to reach a corresponding velocity, and assuming the road to be even...

Homework Statement Calculate Delta G naught rxn and K for the reaction: 2 Fe 3+ +2I- <--> 2 Fe 2+ +I2Homework EquationsThe Attempt at a Solution I came up with -.24 V for E naught and plugged it into ( -2*96.5*-.24) and got Delta G as 46.32 KJ but I don't know if this is right and I'm not...

According to Newton's 3rd law, force exists in pair. When I attach a ball to a rope and rotate it, I am giving the ball an centripetal force to keep it moving in circular motion, so is the tension in the string the reaction force I am asking? I also want to ask about the reason why centrifugal...

How do interpoles reduce armature reaction in dc machine? What is exactly the cross magnetizing effect ??

Hi mfb: The following messages were in the now closed thread "Neutrinos-Antineutrinos in the universe". Bill_K said (msg #2): Most of the neutrinos we detect are solar neutrinos coming from p + P → d + e+ + ν. I said (msg #5): Is the "P" here a typo where "p" was intended? If not, what does...

Homework Statement why the object will fall of when the normal reaction force is less than zero ? P/s : the normal reaction force is in downward direction... How if if the normal reaction force is less than zero ? the normal reaction is in upward direction ? Homework EquationsThe Attempt at a...

Homework Statement Thewheel is rotated in the anticlockwise direction...The correct reaction force is drawn using the blue pen . I don't understand why the reaction force isn't directed to the left ? which is drawn using the red colour ? IMO, the red colour should be correct because the...

Homework Statement As you can see , the writer state that the direction of normal reaction force(R) is acted upwards , I have another book state that the normal reaction force (R) is acted downwards , which one is correct ? Homework EquationsThe Attempt at a Solution [/B]

Anybody can help for calculation of the heat of the following reaction? Some background: Ligand X bind to protein M, the product is MX. Binding affinity of X to M is K = [MX]/([M]*[X]). [MX], [M], [X] are the concentrations of each stuff after the reaction finished. The ratio of MX to total M...

Homework Statement A reactor fires out ##10^{21}## neutrinos per second. A detector containing ##10m^3## of liquid which contains 30 carbon atoms every 60 hydrogen atoms. The detector-reactor distance is ##1000##. The cross section for the reaction is ##\sigma = 10^{-46} m^2##, and the density...

So, I heard the other day from someone online who claimed that if the sun would to suddenly disappear that the Earth would still travel in its regular path for 8 minutes before breaking off. The person claimed that because it takes light 8 minutes to reach Earth, and that since nothing can...

I hit a bench with my fist, I experience equal and opposite reaction... Science says, it is because the nuclei of the atoms of my fist come close to the nuclei of atoms of the bench and experience repulsion. Am I on the right track?...Are there other explanations?

Homework Statement Hi guys, I'm currently working on a homework question but I'm a little bit stuck although I do know what I'm meant to be doing. My question asks me to find the torque being caused by a beam pulling down on another. I'll explain a little more the context of it - there is one...

Dear PF Forum, I'm just wondering about P+P reaction in star. Because of its pressure, in the core of the star, hydrogens fuse to become deuterium. Its the complete reaction P + P -> D D + P -> He3 He3 + He3 -> He3 + P + P and if the star is big enough, it can undergo CNO cycle, But what if...

What's the reason for which double displacement reaction occur? Why there is a need for ion exchange between two compounds? They are already in a bonded state, a stabilised one. So what benefit would a double displacement reaction give? The ionic reaction AgNO3 +NaCl - - - - > AgCl(ppt) +...

Homework Statement Fission Reaction: Pu-239 + gamma --> Sr-92 + ? + 3n Q-Value = ? (Answer in MeV, correct to 5 significant figures) Atomic Masses (u) Alpha Particle = 4.00150618 He-4 = 4.0026032497 Pu-239 = 239.0521565 Sr-92 = 91.911030 n (neutron) = 1.00866501 Homework Equations...

I have a question about direct energy conversion; if I want to directly extract electrical energy from the fusion reaction p+Li-7 reaction which generates He nuclei, with a kinetic energy of 8 MeV, what is the most suitable method of doing that? Should some method with charge separation be used...

Hi, I have a very interesting but challenging question. Consider any chemical reaction that involves gas production (e.g. H2 gas is produced in KOH etching silicon). As we know, the produced gas will detach from the surface and reaction can continue. What if the gas doesn't detach from the...

Is there a way to determine the specific heat of a reaction before said reaction is introduced. thanks in advance for all of your inputs.

Does anybody know where I could find worksheet to practice naming the state of matter in chemical reactions (with answers in the worksheet to check) as I have problems with that. Especially deciding when it is aqueous. I know (well at least i am right) that when you have acid as reactants it has...

Homework Statement Find the product: 2. Relevant concepts Thiols react with vinyl ethers according to anti-markovnikov's rule The Attempt at a Solution After reading Jerry March's book, i came to know that it follows free radical mechanism and that is why it gives anti markovnikov's...

I found this in "March's Advanced organic chemistry" After that step, on using HCl in pentane, you will get 4-methyl-3-Heptanone. So this method was used to convert achiral 2-pentanone to a chiral compound, by first converting it to the compound on left by addition reaction and then using a 2...

Homework Statement The question: For an nth order reaction ##\frac {t_{1/2}}{t_{3/4}}## depends on (n isn't equal to 1) : (A) initial concentration only (B) 'n' only (C) initial concentration and 'n' both (D) sometimes 'n' and sometimes initial concentration. Homework Equations...

It's known that the nuclear reaction rate (inside a Star) can be determined with $$R_{ab}=n_a n_b\left<\sigma v\right> \, \approx \, n_a n_b \Big(\frac{8}{\pi m_e}\Big)^{1/2} \frac{S(E_0)}{(k_BT)^{3/2}} \Delta \frac{\sqrt{\pi}}{2} e^{-3E_0/k_BT},$$ where ##k_B## is Boltzmann constant, ##T##...

Homework Statement The product formed in the reaction of SOCl2 with white phosphorus is 1. PCl3 2. SO2Cl2 3. SCl2 4. POCl3 Homework Equations NA The Attempt at a Solution I can google that but I want to know that how can we know it intuitively or by ourselves? It was asked in a test and in...

Homework Statement [/B]Homework Equations [/B] kg/m3 = mass / volume Downward forces on the column = Weight + Additional force (F=ma) The Attempt at a Solution [/B] kg/m3 = mass / volume Therefore, 2400 = mass / (0.3 x 0.4)...

There is an ever constant increase of CO2 and CH4 in the atmospheric, thanks to global warming and greenhouse gases. I came across this equation while looking over changing gas compositions in the atmosphere. CO2 + CH4 ----> 2H2O + C2 Can someone explain me how I can figure out the amount of...

We got a light source and the light comes through a slit in a plate. A photon passes through the slit and ends up somewhere on a screen not in the straight direction due to diffraction. The question is, in quantum physics, does the plate feel the reaction of the photon deflection (1) at the time...

I know little to nothing about chemistry, but am fascinated by its physics. Bought some gallium off amazon, which came shipped via AIR from china! (my God I hope that wasn't a passenger plane) and wow is it ever neat stuff. Any ways of course I wanted to try putting some Gallium on Aluminum...

If you remove heat from an exothermic reaction will the equilibrium shift to the products or to the reactants according to le chatelier's principle

Who is the trigger of the oxidation reaction. Copper which attracts electrons from the Zinc or solution which makes Zinc losing electrons and become positively charged. I am struggling to understand what actually makes Zinc to enter the solution and leave 2 electrons behind. If there is no wire...

Who is the trigger of the oxidation reaction. Copper which attracts electrons from the Zinc or solution which makes Zinc losing electrons and become positively charged. I am struggling to understand what actually makes Zinc to enter the solution and leave 2 electrons behind. If there is no wire...

Homework Statement Determine the oxidizing agent, reducing agent, element oxidized, element reduced, # of electrons lost per atom, and # of electrons gained per atom. State if the reaction is not redox. 3FeCl2(aq) ------> 2FeCl3(aq) + Fe(s) Homework EquationsThe Attempt at a Solution...

Homework Statement Imagine a hypothetical process in which the methane molecule, CH4, is "expanded," by simultaneously extending all four C−H bonds to infinity. We then have the process: CH4 (g) → C(g) + 4H(g) Compare the reaction for the "expansion" of methane with the reverse of the reaction...

Homework Statement Calculate reaction forces R1x, R1y, R2x, R2y. Load of 100N. Node 1 and 2 are fixed. Distances listed on image. Homework Equations [/B] I have: ∑Fx = 0 = R1x + R2x ∑Fy = 100 = R1y + R2y ∑M2 = 0 = (-100 x 0.1) + R1 x 0.06 + R1y x 0.02 ∑M1 = 0 = (-100 x 0.04) + (-R2x x...

Hello PF! I have a simple question on energy balances. Suppose you have an isothermal reactor where you want to have an exothermic reaction happening at 450 °C. The simplified energy balance for the reactor is Q = ΔH. Supposing ΔH = -150 kcal, then Q = -150 kcal. Does this mean that, a) in order...

A ladder pipe with a 2" tip at 80 psi nozzle pressure will have approximately ____ pounds of nozzle reaction. Now I've been out of college and out of practice with my math and physics skills for quite a while. With studying my firefighting materials for operations, a lot of the statements by...

Hello, As I understand it there is an equal and opposite reaction for every mechanical action. In the case of a vehicle drivetrain the engine generates a torque at the flywheel or flex plate which becomes an input to the transmission and ultimately the wheels. The rollong resistance of the...

Homework Statement Given the data in the table below, ΔH°rxn for the reaction 4NH3 (g) + 5O2 (g) → 4NO (g) + 6H2O (l) is ________ kJ. Substance ΔH∘f(kJ/mol) H2O (l) -286 NO (g) 90 NO2 (g) 34 HNO3 (aq) -207 NH3 (g) -46 Homework Equations ΔH°rxn = ΔH°products -...

Hi, I'm wondering if an aqueous solution of Calcium Bicarbonate and Ammonia would react to form Ammonium Bicarbonate and Calcium Hydroxide. Additionally, would Calcium Carbonate react with Ammonia in solution to form Ammonium Carbonate? EJ

My concept of enthalpy change is that the change is based on limits that approach zero. Something like the heat evolved/absorbed per second (but instead of second its a infinitely small). A+B→C ΔH=100J/mole of A (standard enthalpy change) And as such when the reaction first proceeds the...

Limestone stalactites and stalagmites are formed in caves by the following reaction: Ca2+(aq) + 2HCO3-(aq) --> CaCO3(s) + CO2(g) + H2O(l) . If one mol of CaCO3 forms at 298 K under 1 atm pressure, the reaction performs 2.48 kJ of P - V work, pushing back the atmosphere as the gaseous CO2 forms...

I have two motors(m1 &m2) placed on a vertical position(on the ##y-axis##), that have gears connected to their shafts, and I placed the gears next to one another. Fixing them to move together. I now powered both motors allowing their torques to oppose one another and cancel out each other's...

Please see the attached picture. I'm not sure which hydrogen would be anti-periplanar. Any help would be appreciated. Thanks!

Homework Statement The right angle boom which supports the 230-kg cylinder is supported by three cables and a ball-and-socket joint at O attached to the vertical x-y surface. Determine the reactions at O and the cable tensions. Homework Equations M [/B]= r x F unit vector =...

Homework Statement A certain pyrite ore contains 85% of FeS2 and 15% of inerts. This ore is introduced into a roasting furnace with 20% excess air, in order to oxidize the FeS2 in the reaction: \textrm{FeS}_2 + \frac{11}{4}\textrm{O}_2 \rightarrow \frac{1}{2}\textrm{Fe}_2 \textrm{O}_3 +...

Can someone please explain to me why the answer to the following question is Krypton? A step by step solution would be ideal please! (b)The following reaction occurs in a nuclear reactor: 235U+01n →141Ba+X+301n+202.5MeV (i) Identify the element X. Many thanks! (Question is Q12 b part i...