Reaction Definition and 1000 Threads

how the rate of heterogeneous reaction changes with the surface area of catalyst. can anyone tell me about the equation relating both quantities?

hello forum, consider an object attached to a rope and rotating in a horizontal loop. The tension T in the rope provides the centripetal force points toward the center of the loop. But forces always exist in pair (action-reaction). what is the other force in the pair where one of the...

Three substances of nickel, chromium and cobalt, lead to dermatitis ratio accounted for 25 substances, the first, third and fourth place. Does anyone have any suggestions on what kind of reactions between metal and sensitivity skin? Thanks in advance for any suggestions

Homework Statement Balance Cl2+NaOH -> NaCl + NaClO3 + H2O

Homework Statement Write a balanced net ionic equation for the following chemical reaction Homework Equations Cr^{3+} + ___NH3 (aq) + ____H2O (l) → Cr(OH)3 (s) + ___NH4^{+} (aq)The Attempt at a Solution The balanced molecular equation is Cr^{3+} + 3 NH3 (aq) + 3 H2O (l) → Cr(OH)3 (s) +...

Hi today I took my O levels spa and the reaction was acidified KI+hydrogen peroxide. Once we see a slight colouration, we stopped timing the stopwatch. We were told to draw a tabulation box with the information in the experiment. Also we were told to clearly show the total volume of the solution...

What is the physics behind magnetorquers and reaction wheels which help in satellite attitude determination and control?

What is the physics behind magnetorquers and reaction wheels which help in satellite attitude determination and control?

hi I'm taking GCE O levels so this might give you an idea of my level of chemistry. For a reaction like 2H2O2-->2H2O+O2 and the question tells me it has an ΔH=-98kJ/mol so does it mean that when 2 moles of hydrogen peroxide decomposes to form water and oxygen, the net amount of heat generated is...

Does increasing the amount of mass of the catalyst increase the rate of reaction? I'm not sure as increasing the volume of one reagents doesn't increase the rate of reaction. But for a catalyst I'm not sure if it works the same way. If the catalyst is solid then the concentration will be...

We were doing a small assignment on rates of reaction and I plotted the data I received from the lab we did today. It looks like a perfect graph of log(x) I have no idea why the instantaneous rate of change decreases over time. We haven't done this (we were only asked to graph, we're doing the...

Hi everyone! I basically understand how the materials used in the chemical reaction of a battery work but now I want to know why some batteries have different ratings of voltage. From what I've read, this depends on the materials that are used. What does it mean for some materials to do...

Homework Statement For the production of chlorobenzene reaction: 1) C6H6 (l) + Cl2(g) → C6H5Cl (l) + HCl (g) 2) C6H5Cl (l) + Cl2(g) → C6H4Cl2(l)+ HCl (g) 3) C6H4Cl2 (l)+ Cl2 (g) → C6H3Cl3(l) + HCl (g) Is any of the C6H4Cl2 produced in reaction 2 used up in reaction 3? Homework...

I have this reaction mechanism but I am not sure if its correct or not. In lab we reduced the m-nitroacetophenone using tin and HCl and then using sodium hydroxide to make m-aminoacetophenone. This mechanism goes beyond the scope of our class and not sure why our lab teacher had us do it and its...

What kind of reaction is hybridization.It is endothermic or exothermic.

Homework Statement I need to work out what is happening with the above reaction. Why is my data showing a very slow hydrogen gas production rate (if it even is hydrogen gas), in fact, even slower than the production of hydrogen gas from the reaction of magnesium and ethanoic acid. All acids...

What is combustion - is it any reaction that produces energy? Or is it an exothermic reaction involving oxygen?

Homework Statement Find the reaction rate of a star purely of Hydrogen at temperature of 15MK, density of 150gm/cm^3, most of the reactions take place at R0=0.25R. Each reaction released energy of 25MeV Homework Equations This is the part I'm lacking. I've got the number of protons...

Hi, I've been working on a tubular sub frame, that I want to attach to a main frame. The attached shows the sub frame in black lines. The main fram is in purple. There are only four connection points and a force pushing down on each side. When I check for the reaction forces and make...

Hello, just wondering what would be produced when chloramine and dichloramine is introduced to sodium carbonate. In a reaction including dichloramine I can't decide whether the reaction would proceed as the following: NHCl2 + Na2CO3 ---> 2NaCl + CO2 + NO + H Or NHCl2 + NaCO3 ---> NaCl...

1-chloro-4-vinylbenzene ----> (i) Mg Turning/ THF ---> ? (i) Me3SnCl If this reaction is done, what will be the final product?

So, semi-simple antimatter physics state that when antimatter comes in contact with regular matter, an explosion occurs. If there is only antimatter and matter in the universe, how can antimatter even exist, since it will come in contact with matter at one point and explode? So how are...

Homework Statement I am given a scenario where a photon and a nuclei interact and create two daughter nuclei/particles. I won't bother with the full scenario as it would be nice to solve this generally, but we may assume we know the mass of all nuclei involved. The question is then what...

Homework Statement I'm doing report for a Thermochemistry lab and I need to calculate the molar enthalpy of formic acid, ΔH°2. Two reactions are taking place 1) H3O + OH <-> 2H2O with ΔH°1 = -58400J/mol and some q1 2) HCOOH + OH <-> H2O + HCOO and we need to calculate ΔH°2. I also know the...

Homework Statement Which has the max. value of KP- a)MgCO3(s) --> MgO(s)+CO2(g) b)CaCO3(s) --> CaO(s)+CO2(g) c)SrCO3(s) --> SrO(s)+CO2(g) d)BaCO3(s) --> BaO(s)+CO2(g) Homework Equations The Attempt at a Solution I don't understand how we could determine which has the max. Kp...

[b]1. How many liters of hydrogen gas will be produced at 280 K and 96 kPa if 1.74 of Na reacts with excess water according to the following equation. 2Na + 2H_{2}O \rightarrow2NaOH + H_{2} Im gussing I am going to have to find the number of moles of H_{2} before I can do anything...

I am kind of confused about this. What is the action and equal and opposite reaction?

It is known that if a charged particle accelerates then it emits electromagnetic wave (energy). If so then this means that the work we do on particle, W=F*s, doesn't all go to particles kinetic energy, E=0.5*m*v^2. Then this means that Newton's F=m*a doesn't hold for charged objects, particles...

1. Find the equlibrium constant if there is 0.030moles/L of Carbon Dioxide going in the forward direction and water is in excess to form Carbonic Acid (H2CO3) Homework Equations [products]/[reactants] = K The Attempt at a Solution I'm trying to figure out how Carbon Dioxide in...

Can anyone help me with this problem? Find the pH when 45.0 mL of 0.250 M NaOH(aq) is added to 35.0 mL of 0.200 M HCl(aq). I started by converting the molarities into moles but I'm having trouble with what the reaction should look like. Shouldn't it produce a salt (NaCl) and water? And...

Initial Compound is like this Ph---CO---O----CO----CH3.(Ph means phenyl) It is reacted with H3O+. What will be product? I think first attack will be at carbonyl carbon near methyl. Because phenyl ring will donate electrons to carbonyl group near it and make it less attractive towards...

tried posting in homework help, but haven't received a response would appreciate any input! original topic: https://www.physicsforums.com/showthread.php?t=584077 the problem: http://desmond.imageshack.us/Himg839/scaled.php?server=839&filename=truss1.png&res=medium i can't figure out...

When I apply a force to a wall and the force applies a contrary force, what is causing the wall to apply this force on my hand on the atomic scale?

Organic chemistry reaction Help . !URGENT! Homework Statement I can't type the O-Compounds so here's the Question http://dl.dropbox.com/u/41389643/Photo%2001-03-12%204%2047%2021%20PM%20%281%29.jpg Homework Equations The Attempt at a Solution This is the first time I came...

I have been doing some research on ozone recently, and I have a question that none of my resources have answered... The following reaction is an exothermic reaction, but how would I calculate the amount of heat energy is released? O_{3} \underbrace{\rightarrow}_{uv\ light} O_{2} + O...

Metals will react with acid to form a salt and water. But won't the metal also react with water to form an hydroxide? Similarly, when I put sodium metal into a zinc sulfate solution will displacement occur or will the sodium react with water? Thanks for the help!

Homework Statement Show that processes involving rapid chemical reactions are irreversible by considering the combustion of a natural gas (e.g. methane) and air mixture in a rigid container. Homework Equations Q_{in}+W_{e,in}-W_{b}=\Delta U+\Delta KE+ \Delta PE The Attempt at a Solution I...

Homework Statement sodium oxide plus water --> ? Is there a reaction? Homework Equations sodium oxide plus water yield sodium hydroxideThe Attempt at a Solution Na2O + H2O --> 2NaOH I don't understand whether or not there is a reaction. The problem does not give any states of matter, so how...

Homework Statement Calculate the reaction MA http://alkaspace.com/is.php?i=134123&img=E-3.1.jpg Homework Equations The Attempt at a Solution First I have put the reaction By as an hyper static force. Then I found the deflection in B with the force By as a variable. vb=...

Homework Statement In the reaction between a reactive metal and an acid the rate depends on the concentration of the acid. In a perfect experiment with all variable kept constant the rate of reaction and the concentration would be directly proportional to each other. However if in the...

If we use heat and a catalyst to crack water into oxygen and hydrogen, how can the efficiency of the process ever be less than 100%? Every joule that doesn't crack open the bonds and end up in the chemical energy of the products must end up as heat, and then we're back at square one. I'm...

When a more reactive metal displaces a solid metal oxide, a lot if heat is required for the reaction to occur. However, both metal and metal oxide can be solid for the reaction to take place right?

I've known about the basic story of the first nuclear pile since before I can remember, but never found information on what the associated nuclear reaction actually was and was wondering if anyone here knew or could point me in the right direction.

Why do birds get so excited and chipper when the sun shines? Shouldn't they be singing all the time? Does it have something to do with thinking spring is coming and needing to attract a mate? But then... what about when birds sing on sunny winter days?

I have just done an experiment on the clock reaction between iodine and persulfate ions. Using my experiment result, I have determined that the reaction orders are about 1.2 with respect to both persulfate and iodine ions. There is this question ' Explain why the reaction orders should be...

Homework Statement CuCl2(aq)+Al(s)→AlCl3(aq)+Cu(s) Homework Equations The Attempt at a Solution I'm just not sure what to do with a situation involving compounds. I can do simple balancing without a problem. Here is my attempt. Please, please let me know where I went wrong...

Also the chemical involve in the W and iodine. Thx

Homework Statement predict the reaction: Ca(NO3)2 (aq) + NaHCO3 (aq) -----> The Attempt at a Solution Ca(NO3)2 (aq) + NaHCO3 (aq) -----> Ca(HCO3)2 (s) + NaNO3 (aq) OR Ca(NO3)2 (aq) + NaHCO3 (aq) -----> CaCO3 (s) + NaNO3 (aq) + H20 (l) Will Ca2+ + CO32- combine, and H+...

I’m not very well versed in chemistry so am asking for help. I’m looking for a couple of safe chemicals which combine to react (or dissolve etc.) endothermically. It doesn’t have to be an impressive reaction, it just has to be safe and not produce masses of gas (so that’s carbonate/ bicarbonate...

Homework Statement -------Solution1:-----Solution2:-----Solution3:---------- Solution4:-----Solution5:--------------- Solution6: Exp. 0.200M KI-----2% starch-----0.020M Na2S2O3 -----water----0.050M acetate buffer -----0.40M H2O2...