Reactions Definition and 650 Threads

Dr. John R. Hibbing of the University of Nebraska-Lincoln, USA, has published several papers which basically say that there is a correlation between certain physiological reactions of a person and her political ideology (or at least her position in the American political spectrum, with Hibbing's...

Homework Statement What is the reaction occurring in H2O + SO3 -> H2SO4 2. The attempt at a solution Sorry, if this is dumb, I was confused about this question because I think its synthesis but I thought it only worked with elements? (Element A + Element B = Compound AB) But then with this, I...

Homework Statement I'm perpetually confused keeping track of the energetics of a nuclear reaction and I broke down my conceptual questions into the following parts statement a-In a fission reaction, the two medium sized daughter nuclei each have more binding energy per nucleon than the original...

Homework Statement Lead (II) nitrate + manganese (IV) iodide -> _______ 2. The attempt at a solution So I think I know how to do this 2 Pb(NO3)2 + MnI4 -> 2 PbI2 + Mn(NO3)4 I'm just a bit confused because with single displacement you have to check the activity series? And so I'm not sure if I...

I am not talking about the reactions of simple atoms in chemistry, I am speaking, for example deuterium, heavy water, isotopes of hydrogen, oxygen, carbon, etc.I would like to know how to calculate when two atoms merge, to know mathematically what atom will form, example deuterium + deuterium =...

Please can someone help explain these to me? I have completed a-d but I'm not how e works. I thought gamma was an exchange particle so should it then decay further?

Homework Statement When trans-2-methylcyclohexanol is subjected to acid-catalyzed dehydration, the major product is 1-methylcyclohexene. However, when trans-1-bromo-2-methylcyclohexane is subjected to dehydrohalogenation, the major product is 3-methylcyclohexene. The attempt at a solution...

Homework Statement A proton of kinetic energy 0.42 x 10-11 J is fired at a stationary oxygen-18 which has a binding energy of 2.35 x 10-11 J. This reaction produces flourine-18 of binding energy 2.30 x 10-11 J with the production of a neutron and gamma ray. Q1) Explain why the high energy...

The Attempt at a Solution Firstly, since -Br is the better leaving group among the three, it's either (a) or (b). Further, since -Br is present at α position in (b), which also has an acidic α hydrogen to the same carbon, it would react better with a weak nucleophile (favouring SN1) than in (a)...

I was wondering if there is a good example of a chemical reaction cascade that reverses itself, or does a "loop" in nature outside of life? First thing that came to mind was water evaporating and coming back down from clouds, but that is not really a chemical reaction. Or would it be considered...

What is the best possible way to learn all the reactions in organic chemistry, where should one start, what are the fundamental topics to be covered and remembered all throughout for building up a great strong base in this part of chemistry?

I`ve spent some time reading about the baryon asymmetry and the Sakharov`s conditions, and there some things I didn't exactly get: 1. Interactions out of thermal equilibrium: isn't it trivial? our universe is expanding so, of course, it out of equilibrium. 2. CP violation: I`ve read that Cronin...

How easy (or not) is it for spontaneous chemical reactions to occur in a living cell, but particularly reactions that are not a result of and between coded molecules? For example, when we eat food, in the process while the essential molecules are being taken to be integrated into "coded...

I am currently using luminol to visualise cavitation via sonochemiluminescence. When bubbles in solution are exposed to ultrasound they cavitate and draw vapour inside them. The bubbles crush the vapour breaking bonds and radicals are produced. These radicals then do the following (from my own...

Isn't this a breakthrough? Well, a base for a breakthrough? I have always wondered if a complete theory or accurate prediction of the formation of bonds and molecules is possible... I tried to think about this myself... :) What do you think...

I have attempted this problem several times, but I keep on getting an incorrect answer. I have tried mostly substitution reactions (SN1 and SN2) on the top bromine atom, and I know that a double bond cannot be formed at the bridgehead. Any help in the right direction is greatly appreciated. Thanks!

Homework Statement I'm having a hard time finding the reactions at the supports and the force exerted by the spring. Given: 20 lbs 25 lbs 35 lbs k = 200 lb/ft lo = 2.5 ft members are 4 ft longHomework Equations ΣM ∑Fy = 0 ∑Fx = 0 The Attempt at a Solution I tried solving for the reactions...

If I have a container filled with oxygen and hydrogen and heat it up, it would react and create water and heat. Why was heat released? What happens in chemical reactions at a microscopic level that makes it release energy in the form of heat?

Homework Statement Show, using spacetime diagrams and also using frame-independent calculations, that the law of conservation of 4-momentum forbids a photon to be absorbed by an electron, e + γ → e. Homework Equations ##\textbf{p}_{e1}+\textbf{p}_{\gamma}=\textbf{p}_{e2}## ...

Homework Statement My problem deals with understanding why we substitute in the reaction kinetics equivalent into mass conservation equation instead of dealing with differentials Homework Equations From the conservation of mass law about an envelope: $$\frac{dm}{d t} = \sum m_{in} - \sum...

Do instantaneous Reactions happen at infinite speed?

I'm fairly new to nuclear engineering. Basically two questions regarding nuclear fission. 1) Neutrons hit atomic nuclei of fuel in reactor which in turn causes atoms to decay until a stable atomic isotope is ultimately reached. However, surely the "stable" isotopes (and also those unstable...

Hi, I am trying to simulate in 3D a bunch of chemical reactions. Some of them are complex and I would like to be able to just spawn the elements and molecules and watch them collide to see what happens. Is their any free software to do this?

AgBr →Ag + Br2 This reaction takes place in presence of light energy, but why only light ?? Why not electricity, heat or any other forms of energy?

Homework Statement Solve for support reactions of a rigid, rectangular steel frame sitting on rubber pads at the four corners (See attached), when a shear force and a moment is applied at some point on the frame. All the known variables are shown in black while the unknown are in red. It is a...

I am looking for reactions that can power a small car. I'm currently working on a college project where we have to make a car powered by a chemical reaction. Could anyone guide me in the right direction?

Hello, I have two question if you please answer them. Thanks in advance. 1) In beta- decay, Electrons can have zero kinetic energy. Do they mean that they initially had kinetic energy to overcome the coulomb attraction which manifests itself in the "Free" electron mass? So it can literally...

Okay...I read that the decomposition of water is a reversible reaction (because the constituents can react to form water and water can decompose to form constituents)...This lead me to another thought that almost all compounds can be decomposed (although it is true that their conditions for...

All, I am looking for a logical step that I must be missing in order to understand how heat energy is produced in an exothermic reaction. All of the standard explanations--more heat is given off than is taken in--don't seem satisfying. If heat is the result of the kinetic energy of molecules...

Actually, I want to how the chemical reactions are written. Is it based on stoichiometry or atomic configuration or just by assumption, For eg. 2PbS + 3O2 → 2 PbO + 2SO2 PbS + 2O2 → PbSO4 look at these reactions they have same...

Is the atomic number and mass number conserved in nuclear decays?

Homework Statement Classify the following actions based on how they could affect a reaction rate (rate increases, rate decreases, rate is unaffected) and provide a brief explanation as to why: Add a catalyst Decrease the concentration of a reactant Decrease the surface area of a solid reactant...

Homework Statement Hello. Given the statically determinate truss shown in the image, solve for all forces in the members, in terms of the load P. Homework Equations Equations of equilibrium. Node analysis. Section analysis. The Attempt at a Solution I was able to solve it by solving first...

Homework Statement In the example A , Why the author stated the total reactions = 9 only ? How to determine the total reactions for this type of questions ? Homework EquationsThe Attempt at a Solution we can see that there is a total of 3 reactions (vertical , horizontal and moment) at the...

Homework Statement why the number of reaction is 3 ? How to know that ? shouldn't the total number of reaction = 8 ? Homework EquationsThe Attempt at a Solution There are 4 pinned support in the structure . Each pinned support can support vertical and horizontal reactions...

I am so stressed right now and am on the verge of a nervous breakdown. My chemistry homework is just really confusing and I need to pass this class, could someone please help me out? I need to hand this in tomorrow and I have already answered the questions myself but I feel like my answers are...

Hello! I have a feeling and I would like to know if it is true. I feel that if a reaction between two gases, takes place in high temperature only (perhaps with the presence of a catalyst), then if we increase the pressure high enough and keep the temperature low, the reaction may still take...

Homework Statement A beam of ##^{50}##Ti nuclei impinged on a ##0.5 mg/cm^2## thick ##^{208}##Pb target in an experiment lasting 176 hours. During that time a total of ##3260 \; ^{257}##Rf nuclei were detected. The beam intensity was throughout the experiment constant at ##6.6\mu A##. Each...

What do i have wrong here for my chemical equation? Seems to be right but my homework won't accept it. Balance the redox reaction occurring in acidic solution. Sn(s)+MnO−4(aq) → Sn2+(aq)+Mn2+(aq) Express your answer as a chemical equation including phases. 5Sn+2MnO−4+16H+→5Sn2++2Mn2++8H2O...

Homework Statement Need help at "Forming an equation based on the fact that all the vertical forces must be in equilibrium". I'm to calculate the reactions at the supports A and B by doing: (i) Forming an equation based on the fact that all the vertical forces must be in equilibrium (ii)...

A little complicated and interesting story, I will get down to the point: I need a number of substances that cause skin rashes/skin redness or overall has a bad reaction to human skin. This is all for research purposes for natural skin products me and a group of friends are developing.

Is there a way to predict what resins form solids based off certain hardeners.

Hi, I am wondering about latent heat release when water freezes but it seems best to start with a regular exothermic reaction. How does bond formation create heat? What is actually happening at the microscopic level so that these combining particles are capable of causing adjacent molecules...

Several articles I've read say that the basis for BBN is that we know how particles react here on earth, so we can extrapolate that and make precise predictions for the composition of the universe at a given energy level. For example, at 100 Billion K, we have a pretty good idea how neutrons...

Hello to everyone who reads this. :) Homework Statement I DO understand the two following points.: 1. If the redox potential of a redox reaction is positive, then the redox reaction is spontaneous. 2. If the redox potential of a redox reaction is negative, then the redox reaction is NOT...

Homework Statement An unbalanced pulley 8in. radio. and 32.3 pounds weighing. It has a radius of gyration of 6in with respect to its axis. When a pair M = 100pie.lb applies, lifts a weight W = 96.6 pounds. In the position shown in the figure, the pulley has an angular velocity of 3 rad / sec...

Hello, Firstly, I apolagize if this should go in "HW help". It isn't homework, and the question doesn't fit the format of "HW help", but it is so elementary, so I don't know. I'll write my questions in bold. Although I think I understand what redox reactions are--a reaction in which an...

Hi, up to this day I thought that endothermic and threshold reactions are equivalent. I mean each endothermic reaction must be threshold and each threshold reactions must be endothermic. But I think I was wrong. Here is example (from this source Q-value): 10B(n,2*alpha)T This threshold...

Suppose I have a beam and I would like to constrain it (two dimensional structure). At one end I've chosen to use support which constrains motion only in "x" and "y" direction (horizontally and vertically), but it doesn't prevent a body from rotation. Because of that, another beam's end have...

Probably the title wasn't really clear. What I am asking for is an explanation. Isn't the potential of the electrode is created by a combination of ions and electrons? and we can't possibly measure the absolute potential. However, we can measure it relative to other electrodes such as hydrogen...