Reaction Definition and 1000 Threads

I thought heat increased reaction rates, meaning that when something is at equilibrium, it should increase both the forward and reverse reaction rates... Is this wrong? Then why does Le Chatelier's principle predict that a temperature increase favors the endothermic direction?

For a piece of coursework I have to design a shaft for a windturbine. The shaft has a load on one end due to the rotor blades and a load on the opposite end due to a sprocket which is chain linked to a generator. The supports are bearings in between the two loads, as shown in this drawing...

[FONT="Century Gothic"]Homework Statement n-butyl alcohol was reacted with potassium bromide in the presence of concentrated sulphuric acid and water. 1) Is hydrobromic acid involved in this reaction? If yes, how so? 2) Is this reaction SN1 or SN2? What is the mechanism? 3) What is the...

i am working on a hoop and its 550mm diameter, 7mm thickness. I applied 1mm displacement from its upper face which is normal to its direction.Stress is 730Mpa which is normal but the total reaction force is 0.0004N which is too low. where do i make the mistake.Material is structural steel...

Classical charged particle's reaction to a retarded field This is something I've been curious about for a while -- every once in a while, I'll see some random reference to it in an article, but I never feel like it's the whole story. The situation is this -- you have a moving classical...

Dear all, I am not an expert of Chemistry and I would like to know if there is a reversible reaction that can be activated only by thermal energy. The result of the reaction should be something which can be brough again to the initial state, releasing again the thermal energy stored. I was...

Homework Statement Reaction time can be crucial in avoiding a car accident. You are driving at 75 km/h [N] when you notice a stalled vehicle 48.0m directly ahead of you. You apply the brakes, coming to a stop just in time to avoid a collision. Your brakes provided a constant acceleration of...

Homework Statement http://img101.imageshack.us/img101/9546/3dstats.jpg Pole AB is supported at point A by a pin joint, and held at point B by two wires, BC and BD, as described in the drawing. At point B acts on the pole force F which equals 500 [N]. The force F acts on a horizontal...

Homework Statement The apparatus below shows an experiment to investigate the speed of reaction between lithium and water. A piece of lithium is wrapped in steel gauze and placed in a beaker of ]water. The volume of gas collected in the measuring cylinder is measured at 10s time interval...

I have learned that the primers in PCR are added to the DNA in the annealing phase, but what exactly do these primers do to the DNA? Thank you

Which fundamental force mediates the reaction \pi^+ + D \rightarrow p + p? My initial assumption was the strong force because states only feature quarks (i.e. there are no leptons) but looking at it again I'm not 100% sure. Do I need to include colour factors? Could it be a neutral current...

Redox reaction...with a twist! In the chlor-alkali process OH–(aq) and Cl2(g) are produced by the electrolysis of a saturated solution of sodium chloride. Explain why chlorine gas rather than oxygen gas forms at the anode. The solution to the question has the word "Overpotential" and I...

Anyone on this forum know what the highest-probability fission chain reaction of plutonium-239 is? Mike Fontenot

Just need some clarification as to whether or not I'm doing this right. 1 drop HCl and several drops KMnO4 added to 2mL NaHSO3. HSO3- → HSO4- + 2e- MnO42- + 4e- → MnO22- 2HSO3-(aq) + MnO42-(aq) → 2HSO4-(aq) + MnO22-(aq) A few questions: -Since NaHSO3 is not an acid, the hydrogen atom...

Hello, I need a few compounds that i can use that are soluble with water that causes the water to cool, so that if ingested it will not do any harm. your advice would be greatly appreciated, also if you may include a chemical formula if it is known. THANK YOU. P.S. this is out of interest...

Homework Statement What are the two final products when cis-2-butene reacts with HBr and CH3OH? Homework Equations Reactions of Alkenes.The Attempt at a Solution I'm not sure if the HBr will attack the double bond first or if the OH on methane will take the H off HBr and create a radical...

There's a catalyst pellet in a reactor and I'm supposed to prove an equation for the maximum temperature which is: Tmax=Ts +[(-H)*(D*Cas)]/k First thing I did was develop an Energy Balance across the spherical catalyst and I got the following equation: (1/r^2)*d/dr(r^2*k*dT/dr) +...

Hi, I have been studying the radiation reaction problem and I see a weakness in the derivation that hopefully someone might illuminate for me. In the textbooks by Griffiths and Jackson, as well as some journal articles I have found, the radiation reaction seems to be "derived" by a suggestion...

i've got thoughts about a series of chemical reactions that would simply keep on repeating. perhaps by time release. the thought is to use this perpetual chemical reaction to create a battery that releases the electrons then has a series of chemical reactions eventually resulting in the two...

Hi guys, I'm wondering how the wall of the cantilever beam (a beam fixed at one end at a wall) can exert a reaction moment? Is this done by the wall pushing back on the cantilever beam away from its centroidal axis? Also is the reaction moment always applied to the centroidal axis of the...

I want to know the fundamentals of finding the force reqd for moving a stationary object such as a car or a segway (which has got two wheels). Also let me know in a formula mu = F/ NORMAL REACTION, WHAT IS THE VALUE OF A WEIGHT HAS TO BE TAKEN? meaning if weight of a person standing on a...

Homework Statement Homework Equations The Attempt at a Solution The problem I'm having is that I'm not sure how to work out the reaction forces because of the applied moment of 50kN.m. I know that the formulas are the sum of forces in a single direction equals 0 and the sum of...

Hello, There is something that has been puzzling me. Sorry if I don't use the correct terminology, this is not my field. When a heat pack made of sodium acetate starts its exothermic reaction, does it release heat for only 15 seconds, but feels hot for ~30 minutes because the sodium acetate...

I have a little bit of an issue. I am trying to find the reactions on this truss. I know there are x and y at the first and y at the 2nd on the truss. But when I create my moment, do it take the 2500 lb into effect for the rope across the top and side as well? or do i omit those? My...

I have a 2 questions regarding Newton’s third law and I will explain them using examples: 1. Body A is pushing against Body B with a force F(AB), Now body B will push against body A with a reaction force F(BA) equal but opposite to F(AB). Now shouldn’t be another reaction force F2(AB) due to...

Hello, Can the reaction forces at the mounting (fixed) holes of a component in a static structural analysis be used directly to find out the forces acting on the mounting bolts? If my understanding is correct, the force in the direction in the axis of the bolt will be used to find the...

When Executing an air blow through a circuit of piping at high volumes and resonable pressures. How would you calculate the reaction force that the piping circuit will generate by the open end exit blow of air? Need a detailed method of how to calculate and what the numbers used represent and mean.

Homework Statement A particle of mass m moves without friction along a semi-cubical parabolic curve given by y2=4ax3 with a constant speed v. The reaction force of the curve on the particle when it is at the point (x = 1, y = 2) is given approximately by The Attempt at a Solution...

can someone explain to me the relationship between enzyme activity and rate of reaction?

Can both the forward and reverse reaction be endothermic or exothermic? Or must they ALWAYS be inverse one another? Thanks

So I'm always having troubles with memorizing the three-phase reaction terms, such as eutectic, eutectoid, peritectic and peritectoid. Are there any meanings of the prefix and suffix? Are there any tricks to memorizing the names and meanings (reactions) of these terms? Thanks a lot!

Homework Statement The reaction rate of nitrogen monoxide and oxygen into nitrogen dioxide is given by the expression r = k [NO]2 [O2], where r = reaction rate k = reaction rate coefficient, which increases with increasing temperature. Homework Equations What is the increase in the...

how do you work out the reaction distance?? i have this big assignment to do at school and i can't work out how to find the breaking and reaction distances ... i have a Vi = 0 Vf= 69km/h reaction time= 0.78sec deceleration of 4.49m/s and my total distance i need to find if i go over is 41 m ...

I can't find a good reliable resause to get a good answer to this question?? can anyone help me by giving me a answer or a good website ?? please ...

Homework Statement Homework Equations N/A The Attempt at a Solution I attempted to figure out the mechanism in reverse. I have tried neucleophilic addition of the alcohol to the carbonyl carbon of the ethanal, followed by the addition of the resulting hydroxyl group (from the...

Homework Statement "State what you would infer from each of the following observations and suggest experiments you would carry out to test the validity of your inferences: When an unpleasant smelling gas was bubbled into an orange solution of a substance 'A', a solid was formed and the mixture...

Homework Statement I think I am just overthinking this... So, the problem is as the picture details. It asks for the reaction forces and moments at each of the two ends (pin joints) using (strain) ENERGY METHODS in terms of the applied force F. the labeled lengths are the lengths of the...

So, I'm building a freeze ray, in a sense, and I was wondering... What would the easiest/cheapest way to produce an endothermic reaction without using ammonium nitrate? The way I have the schematics so far is that I will have two substances that will blend just before exiting the ray, and...

Can a reaction like the diels alder reaction occur if the diene is not conjugated, but can have the proper geometric configuration for the same electron transfer? http://i.imgur.com/sFhLg.jpg Image of example. If my question is unclear, I can clarify further if necessary.

Hi there problem is: given the following nuclear reaction sequence, determine X and Y: _{9}^{15}N+_{1}^{1}H\rightarrow_{8}^{16}O+\gamma _{8}^{16}O+_{1}^{1}H\rightarrow_{9}^{17}F+X _{9}^{17}F\rightarrow_{8}^{17}O+Y+\nu_{e} My Attempted answer is: As far as I can see, Y must...

What is the official medical term for this? I know there is one. Anybody care to explain it further?

Nucleic Reaction!

I understand how nuclear reactors work, and how to stop them. But I am not understanding how you start the reaction? The fuel rods are placed in, and then what? What actually gets the process going?

With all the events happening in Japan right now, I was wondering, what exactly happens during a nuclear meltdown? I have a decent idea of how the plant produces power, but I have no idea what happens during the meltdown to create such a hazardous situation.

Hey, I'm looking for some help understanding how to solve these equations. The math is just a little bit beyond me. I would like to plot the equations over time to see how they are behaving. These refer to the following equations: Do I just sub all of these equations into number...

Homework Statement The following three step mechanism has been proposed for the reaction of chlorine and chloroform (1) Cl_2 (g) \rightleftharpoons 2Cl(g) (2) Cl (g) + CHCl_3 (g) \rightarrow HCl (g) + CCl_3 (g) (3) CCl_3 (g) + Cl(g) \rightarrow CCl_4 The numerical values of the rate...

Quartz, SiO2(s), does not spontaneously decompose to silicon and oxygen at 25 degrees Celsius even though the standard entropy change of the reaction is large and positive (deltaS = +182.02 J/K). Explain why. I am confused by this one fundamentally because it seems like common sense that...

Homework Statement H2 + I2 -> 2HI A reaction mixture in a 3.67 L flask at a certain temperature initially contains 0.763 g H2 and 96.9 g I2. At equilibrium, the flask contains 90.4 g HI. Calculate the equilibrium constant Kc for the reaction at this temperature. Homework Equations The...

) If the rate law for the reaction 2A + 3B → products is first order in A and second order in B, then the rate law is rate I initially thought the answer would be k[A]^2[B] but it's wrong, the correct answer is k[A][B]^2 Could anyone explain?? Please, thank you!

Homework Statement One or more external forces are exerted on each object enclosed in a dashed box shown in the figure below. Identify the reaction to each of these forces. (Assume that (a), (b) and (c) occur on Earth while (c), (d) and (e) occur far from any outside gravitational influences...