Reaction Definition and 1000 Threads

Dear PF Forum, I have a problem with calculating energy which I should have learned long ago in my high school time. If I push (accelerate) a 1 kg object 1 meter/sec2 for 10 seconds, I spend energy like this. Distance = 1/2 at2. So I would have pushed this object for 50 metres. So I'm using...

Hi, I need to size a CSTR for the transesterification of tri-glycerides into methyl esters (bio-diesel) by reaction with methanol and NaOH catalyst. The transesterification reaction taken place in 3 reversible steps: TG + CH3OH <--> DG + ME DG + CH3OH <--> MG + ME MG + CH3OH <--> C3H8O3 + ME...

Homework Statement At 1500 ° C , CO is formed more than at 1000 ° C. Is the reaction from left to right exothermic or endothermic? Homework Equations C(s) + H2O ↔CO(g) + H2[/B]The Attempt at a Solution I think its Exothermic reaction . The temperature is increased from 1000°C to 1500 °C . If...

1. Homework Statement Homework Equations KE = 3/2 R/NA T The Attempt at a Solution By using the formula above, I used 2.4 x 10^-14 J as the mean translational KE , but it should be 1.2x10^-14 , why? I thought the mixture contains both deuterium nucleus and the proton? Why half KE of mixture?

Homework Statement Homework Equations ΣF=0 The Attempt at a Solution Basically I don't agree with this solution, I think it is R1 + R2 - mgcos5 + mv^2sin5/r = 0. Can you help me please? thanks!

Hey guys, I was revising using some past papers for my structural mechanic module when I realized that I don't know how to do this problem: https://physicsforums-bernhardtmediall.netdna-ssl.com/data/attachments/83/83583-240450b2eac78c09f31d35a531383268.jpg If it was for the deflection of node...

What is the equation of forces please for the axis parallel to the banked road? Is it R1+R2-mgcosθ=mV^2/r or R1+R2-mgcosθ=-mV^2/r? Can you advise me please?

Homework Statement Calculate reaction forces for truss. Truss is attached in picture. Homework Equations ΣFx=o ΣFy=0 ΣM about reaction point=0 The Attempt at a Solution attached in picture

Homework Statement Hello, new here! I have a question regarding reversible or irreversible expansions in regards to figuring which equation is needed to figure out work, W. For starters, here is the question: One mole of an ideal monatomic gas is expanded from an initial state of 3 atm and 500...

Homework Statement My design assignment gives the information of reaction kinetics and the reaction chain but not selectivities and conversions. I was told to find those information from scientific articles. I've found some but not really sure how to use them. Homework Equations The Attempt...

Hi guys. This is my first post here. Here it goes. I'm attending an introductory course on particle physics. By now, I'm supposed to know how to find out if a given reaction, say νμ+p→μ++n (for example) is possible or not. Unfortunately, the rules by which a reaction must abide are still foggy...

I'd like to write the chemical equation for the reaction of 1 mole of ammonium hydroxide with .1 mole of formic acid. I understand that NH4OH is not ammonium hydroxide, and it is more accurate to write NH3, implying NH3 (ammonia) + HCO2H (formic acid) --> NH4HCO2 (ammonium formate) but would...

I'm wondering that is it possible? I mean, certain radioactive matter can undergo fission? Sure I know half-life and radioactive decay. This question is asked roughly. I just learn is it possible? Thank you for answers

I find the common physics problem of accelerating boxes that are touching very confusing. (To be clear, boxes are on surface, force comes from one side and all boxes accelerate. Questions typically ask about magnitude of force between particular boxes). Once the boxes are accelerating, why is...

NO TEMPLATE BECAUSE THREAD WAS ORIGINALLY ENTERED INTO WRONG FORUM Hi Guys, I have attached the question that I am struggling with (part b of the question) I have worked out that the conversion of A is X=0.21 Using this conversion I'm trying to work out the time required for the reaction I...

I have a liquid scintillator, the electronics system, and a beam of neutrons from a reactor. How do I calculate the neutron flux? Cold anybody give me a formula or equation? Not this equation: phi = n X v, where phi - flux, n = number of neutrons per cm3, v = velocity of the neutrons, because I...

Hi, My Modern Physics lecturer is of the opinion that the energy dissipated during exothermic reactions is due to infinitesimally small change in mass of the reactants. Similarly, he said that an infinitesimally small part of the food we eat gets converted into the energy using which we perform...

Homework Statement We have a straight bar of specific length that its edges are secured between two walls. However the bar is not parallel to the ground, but has an angle. My question is, what is the force that pushes each of the two fixed points in the walls, down? Homework Equations ΣF=0...

Hello everyone, Is this reaction allowed? π0 + π+ -> π+ + γ (just a single photon) I mean the π+ contributes with the reaction not just by making it possible that two particles decay into a single photon (by changing it's momentum), but also the π0 reacts with the π+, where the...

All guys know the importance of cross section. In a sense, it stands for the possibility of a reaction. I am wondering how many barns above could make nuclear reaction rate almost 100%? Generally speaking, the cross section can span a couple of decades order of magnitude, e.g. 10^-10 to 10^6...

My grandson asked me this question: If in fact,as Newton said,all actions are accompanied by an equal and opposite reaction, then there can be no single actions in the universe;all actions must therefor be part of a reaction between two opposite and equal actions,which are in fact also...

1. Homework Statement Homework EquationsThe Attempt at a Solution I thought it was because the kinetic energy of the neutron is equal to or larger than the binding energy of Uranium.. But that's not the answer. Can someone please explain why? Thanks

Hello all, I have a (at what first seemed) fairly simple question about calculating the forces on this fulcrum design I have. Here is an image of the sketch and free body diagram that I drew: Basically, the pivot point in my real life application is actually a cam, but for the sake of this...

Homework Statement Calculate the reaction force at A? Homework Equations ΣMb = 0 The Attempt at a Solution As there is a pin joint at B it is possible to consider the bar only from A-B. From here I applied ΣMb = 0 120 + 20*2 + Ay*4 = 0 This gives Ay = -40kn Also since there are no forces in...

hi, In the past there were "toys" containing a fluid and a clip. When pressing the clip, the fluid became hard and it gave warmth. When the toy was boiled in water, it became fluid again and one could start over. Now I was wondering of there is a chemical reaction that gives cold instead of...

Homework Statement The entropy change of surrounding is greater than that of the system in a/an (A) exothermic process (B) endothermic process (C) both (A) and (B) are correct (D) none of these are correct Homework EquationsThe Attempt at a Solution ΔStot = ΔSsys + ΔSsurr For a spontaneous...

Homework Statement What is the product of 1-bromo-3-propanone treated with vinyl lithium? Homework EquationsThe Attempt at a Solution I know that the carbonyl is attcked by the organolithium but I am having a hard time understanding how it attaches to the carbonyl since it is sp2 hybridized...

I have been reading about how NaOH (Sodium Hydroxide) reacting with HF (Hydrofluoric Acid) yields the products H20 (Water) and NaF (Sodium Fluoride). If I were to do this, would I need the EXACT same quantity of NaOH as HF to get H20 and NaF?

Homework Statement Th-232 ---> He-4 + Ra-228 + energy How much is the energy? Homework Equations The Attempt at a Solution my solution is this: [m(Th-232)-90m(electron)] - m(He-4) - [8m(Ra-228)-88m(electron)] My book skipped the electrons, why?

Calculate the difference between heat of reaction at constant pressure and at constant volume for following reaction at 298 K. N2(g)+3H2(g)→2NH3(g) My attempt ~ At constant pressure ΔHp=ΔUp+PΔV At constant volume ΔHv=ΔUv ∴ΔHp-ΔHv =ΔUp-ΔUv+ PΔV And PΔV = ΔnRT But what to do of ΔUp-ΔUv? In...

There is a classical thought experiment on trying to exceed the speed of light: if you push a light-year-long rod, on whose end is a button that will be pressed by the rod, wouldn't you be vastly exceeding the speed of light (which is the speed of cause & effect) by pressing the button...

Hi guys I was wondering of someone on here could briefly enlighten me on the chemical reactions that would occur with a Teflon Coated high carbon steel hook and a lead sinker while underwater? I am looking into the signals that may or may not be given off by these items both separately and with...

I can't tell the difference between fusion and fission reactions. I know alpha decay is when when Hydrogen is one of products and beta decay is when there is an electron but how do you tell the difference between fusion and fission?

Hi everyone. I'm a high school student. Recently I have been doing some past papers to prepare for the public exam in April. The reaction "ethene + steam ----> ethanol" is given and I was asked to name the type of reaction. I answered oxidation but the answer is addition. Later I asked my...

Homework Statement Data in the table were collected at 300 K for the following reaction: A(g) + B(g) → products Concentration of A 1.00 0.100 1.100 Concentration of B 0.100 0.100 1.00 Initial Rate (M/s) 1.29x10^-29 1.33x10^-30 1.30x10^-29...

Homework Statement Hi, I tried the following task: I tried to solve it, but apparently it's not correct: Can someone show me the right way to do this?Homework Equations See above The Attempt at a Solution see above[/B]

Homework Statement In a particular nuclear reaction, a neutron moving at 3.6×105ms−1 has a 70% chance of initiating a nuclear fusion reaction. Which of the following options is a possible probability of a neutron moving at 2.2×105ms−1 initiating the same nuclear reaction? I wouldn't be asking...

1. Homework Statement (NH4)2CO3 = 2NH3 + H2O + CO2 Homework Equations Decomposition Rxn The Attempt at a Solution I'm not quite sure why this reaction occurred can someone please explain it to me.

Say a lever is tilted on a fulcrum with an object on the side in contact with the floor, a mass falls onto the other side, causing the object to go flying. Does this demonstrate Action-reaction ? (action on the lever to action on the object)

Homework Statement N2O4 --------------> NO2 N2O4 for k = 0.050 s-1 The process starts from 0.20 mole of N2O4 in a container of 4.0L. Calculate v for N2O4. if 3/4 of the N2O4 is converted Homework Equations To calculate concentration c= mole/L The Attempt at a Solution 0.20 mole /4.0 L...

Hi everyone! So I have ZnBr2 and CdCl2, and I am asked to choose the most acidic one. Firstly, I do not understand why both salts are acidic... If my ZnBr2 undergoes hydrolisis, the reaction is ZnBr2 + 2H2O <------> Zn(OH)2 + 2HBr. This would mean that this is acidic as the HBr dissociates...

The question is: Which takes place when a catalyst is added to a reaction at equilibrium? A. The point of equilibrium is shifted to the right. B. The point of equilibrium is shifted to the left. C. The forward and reverse reactions rates are increased unequally. D. The forward and reverse...

Homework Statement Homework Equations ∑Fx=0 ∑Fy=0 ∑M=0 The Attempt at a Solution [/B] I am just concerned with part a. I got the correct answers doing this: First, FBD of segment AB: +cw ∑M_A=0: -136 - 6*By = 0 By = -22.7N two ways to get Ay: one: +cw ∑M_B=0: -136 + 6*Ay = 0 Ay =...

Good evening, I'm an undergraduate astrophysics student currently doing research, and I wanted to get the opinion of some knowledgable chemists about a particular reaction my professor and I wish to emulate. Using a specific type of laser (Nd: YAG, for example), I'd like to mimic something...

Homework Statement Complete and balance the following reaction: Cl2 + OH- → Cl- + ClO- Homework EquationsThe Attempt at a Solution So, I did it like any other redox: Cl2 + 2e- → 2Cl- 2Cl2 + 4OH- → 2ClO- + 2H2O + 2e- Net reaction: 3Cl2 + 4OH- → 2Cl- + 2ClO- + 2H2O However, the answer is Cl2...

If a car us on a frictionless banked track what causes the normal reaction force to be greater than the weight force? My understanding from what I've read is that the vertical component of the reaction force cancels the weight force which makes sense as the object doesn't leave the ground. And...

Hi! is there any microscope or images in which we can see how a matter reacts as it is heated? And how was it proved that when matter is heated their particules vibrate faster?. Tahnk you!

Homework Statement Given that the bond energy of hydrogen-hydrogen bonds is 436 KJ/mol, that of hydrogen-oxygen bonds is 464 KJ/mol, and those in oxygen molecules 496 KJ/mol, what is the approximate heat of reaction for 2H2 + O2→2H2O Homework Equations Hproducts-Hreactants The Attempt at a...

So, I was reading about zeolites: https://en.wikipedia.org/wiki/Zeolite One of the things it is used for, is in the heating industry, namely: "Zeolites can be used as solar thermal collectors and for adsorption refrigeration. In these applications, their high heat of adsorptionand ability to...

Homework Statement FeTiO3+2H2SO4=FeSO4+TiOSO4+2H2O FeTiO3 is an idealized formula of an ore and hence the chemical compound doesn't exist. FeTiO3 consists of TiO2, FeO and Fe2O3. The reaction of each of these with sulfuric acid is as follows: TiO2+H2SO4=TiOSO4+H2O FeO+H2SO4=FeSO4+H2O...