Chemical Definition and 1000 Threads

heey i have this chem homework quest : 5 L flask is filled with 0.625 mol of (N2O4) if you know that concentration of (N2O4) at equilibrium = 0.075 M what is the kc for the rxn ?? 2 NO2 → N2O4 ←

I am totally confused with this question and have trying to figure it out for hours! Co(H2O)6[SIZE="1"]2+ (aq) + 4 Cl- (aq) ----> CoCl4[SIZE="1"]2- (aq) + 6 H2O (l) The equilibrium constant K = 4.82x 10-4 We begin by putting enough [Co(H2O)6]Cl2 (assume the salt dissociate completely into...

Ok the question is some what simple and difficult. I know there are certain rules like a. A + B = AB (combination) b. AB = A + B (decomposition) c. AB + C = CB + A (substitution) d. AB + CD = AD + CB (metathesis) now the trouble i have is not in balancing the equation but figuring out...

Hi , please can anyone help. I need to know what chemical i could use that when drawn on a glazed ceramic tile it will break in the exact place. thanks stuart

Aspirin, C9 H8 O4 (molar mass 180.2g/mol), a drug used to relieve minor aches and pains, is prepared by the following reaction: C7 H6 O3 (s) + C4 H6 O3 (l) --> C9 H8 O4 (s) + C2 H4 O2 (l) If you need to prepare 45.0g of aspirin, and yield for the reaction is 85% how many grams of salicylic...

the Ksp of lead (II) bromide is 6.3E-6. A large amount of PbBr2 sits at the bottom of a beaker with water above it. Equilibrium is reached. Write the chemical equation fo rthe dissociation of lead II bromide as it dissolves for which the Ksp applies. -How would i go about solving this problem?

Discovered that my cat has been urinating in my pool equipment room this winter. My equipment room is in my basement. We store all of our pool chemicals here. I am worried that the chlorine will mix with the urine and create a toxic gas. Could this happen? Sometimes when my husband refills...

Hi, I have 3 questions i can't seem to solve anyways thanks in advance. 1) If the equilbrium constant at a cetain temperature is 24 for the reaction, 2NO(g) <-> N2(g) + 02(g). Both of the systems listed below cannon be in equilbrium because at this temperature because there is only one value...

1. What is the effect of external applied static electic/ magnetic field effect on pericyclic, thermal...etc type chemical reactions? 2. What is the direction of resulting dipole deuto the three dipole arrenged in trianguler geometry?

Acetyl phosphate is produced during acetate fermentation. I can't find the structure for it anywhere. The precursor in this case is Acetyl-CoA, which has the the structure H3CO-S-(Coenzyme A). And of course I know the structure of a phosphate ion. So the only question really is, does...

So, I did 5 labs where I burned certain things and found the temp. diff. in the calorimeter. That said, I calculated the ∆H for the entire system, the ∆H per gram of system substance, and the ∆H per mol of system substance. Im wondering which ∆H I should be putting into my chemical...

hi i have the following reaction isobutyric acid + 2-methoxyethanol <-> 2-methoxyethyl-2-methylpropanoate but i don't know all of the by-products. please help thanks edit: i think is only water and some unreacted reactants?

Is there a program that can make a chemical model for you if you write the chemical formula or the other way around?

I'm about 70% certain of going to this university in order to do my chemical engineering course. Is there anyone who's been to the university, or knows anyone who has been and can tell me what the institution is like, how much work they had to do to get through and any other things which might...

in a Fermi gas, we know that when the temperature is much less than the Fermi energy, it becomes a degenerate gas. does this mean the chemical potential of the system be very large?

Homework Statement I don't understand this problem, i think he wants me to find the limeted reaction. If you could explain as good as possible. Thanks :smile:Homework Equations Al(OH)3(s) + H2SO4(l) → Al2(SO4)3(aq) + H2O(l) If 1.28 g of aluminum hydroxide reacts with 3.73 g of sulfuric acid...

Homework Statement For the system 2 CO2 = 2 CO + O2, ∆H= 510 kJ the percentage decomposition of CO2 changes w/ temperature as follows. Temp, K...% Decomposition 1500...0.048 2500...17.6 3000...54.8 Calculate the equilibrium constants, plot lnK vs. 1/T. In the graph, find the slope and...

Alluminium + Nitric Acid = Alluminiumnitrate Whats the chemical formula for this equation ? :) Thanks

hello, my name is Jesse and I'm new to the forums. I'm in 10th grade chemistry and i have a question. what is the chemical formula of diesel fuel? i searched it on google and found something about hydrocarbon and i have no idea what this is. please help

Homework Statement An engine is operated slightly fuel rich (phi>1). Ethylene (C2H4) and inert nitrogen (N2) are the reactants and there are 40 mol of nitrogen for every mol of ethylene. The hydrocarbons are burned over a catalyst and converted to carbon dioxide (CO2) and water vapor (H20)...

chemical equilibrium law is made using the fundamental rule rate of forward reaction=rate of backward reaction and then applied law of mass action to it but law of mass action is not always correct in giving relation for the rate . so why it is used there? secondly if...

Urgent Advice! Hey guys and gals, I have recently been accepted into the University of Melbourne in their new generation science course and finished enrolment yesterday... only now i can't decide what i want to do with it and i need to decide pretty quicksmart. I've started threads along...

please guide me...urgent -------------------------------------------------------------------------------- i just read the thread abt difference in chemists and chem engnr... thre waz a very gud reply from mr jacone... i m also confused in 1 thing... m studing in new york ... here in my...

Homework Statement This is straight off an old AP Exam, but I can't seem to find it online so I'm hoping you all can help me out. 2 NO(g) + Br2(g) --> 2 NOBr(g) The following results were obtained in experiments designed to study the rate of the reaction above. Experiment Initial...

ok what is the reaction of copper(2) sulfate penta hydrate and distilled water as well strontium chloride hexahydrate and distilled water.:cool:

General Chemistry -- Chemical Equilibria Suppose 1.22 atm of CH4(g), 2.57 atm of C2H6(g), and 15.00 atm of O2(g) are placed in a flask at a given temperature. The reactions are given below. CH4(g) + 2 O2(g) CO2(g) + 2 H2O(g) KP = 1.0x10^4 2 C2H6(g) + 7 O2(g) 4 CO2(g) + 6 H2O(g) KP = 1.0x10^8...

A simple question really. Does acceleration affect the rate of a chemicall reaction. I.e if I was to put some test (chemical) experiment aboard a suitable craft and accelerate it to a high velocity, would the reaction occur at the same rate as it would at rest - ignoring relativistic effects...

Need some help here. I'm going for an interview for Chemical Engineering and I'd like to get some detailed info on what's happening in Chemical Engineering. I've looked at Chem Eng journals for developments and here's where the problem is. I have to subscribe since I'm not actually an...

True. I managed to drive myself to the hospital after being exposed to fragrances at work, and the triage nurse just waved me in based on my appearance. The intake nurse clocked my BP at 208/80 and shoved me into the ER. The ER nurse assigned to me was a classmate of my wife and contacted...

[SOLVED] Chemical Reaction between water and chlorine Homework Statement Whats the reaction between chlorine and waterHomework Equations NoneThe Attempt at a Solution Is it the reversible reaction: Cl2(g) + H2O(l) <----> HCl(aq) + HClO(aq)

Is there anybody here can give me a chemical engineering example that the final differential equation will be LAGUERRE ?

Pls solve my problem quickly as i am junior, i am not expert in solving these: SiO2 + Na2CO3=Na2SiO3 +CO2 So how do CO2 get separated from products,and where did the 1 oxygen atom go, Is this equation needed to be balanced. Why is helium placed in the group of noble gases? Do it reacts...

Consider the reaction: H2O(g) + CO(g) H2(g) + CO2(g) Which of the following statements are true and which are false. false Reactions with large equilibrium constants are always slow. false When Q > K the system will spontaneously shift to the right. false Amounts of all...

Hey. There are currently two degrees i am strongly considering taking next year, and chemical engineering is one of them. Reasons for my choice: I love maths I like chemistry Physics is alright =P The income is decent Now, if i did go for this, id make it a double degree and also do a...

A typical automoblie engine uses a lead-acid battery. During discharge, the following chemical reaction takes place. Pb [sub](s)[sub] +PbO[sub]2[sub] [sub](s)[sub] +2H[sub]2[sub]SO[sub]4[sub] [sub](aq)[sub] +2H[sub]2[sub]O[sub]2[sub] [sub](l)[sub] (1) Pb [sub](s)[sub] +PbO[sub]2[sub]...

I am doing this test on DPPH (a chemical salt [(C6H5)2N-NC6H2 (NO2)3]) The goal of the experiment is to study The Electron Paramagnetic Resonance or The Electron Spin Resonance Buy using this way: see it in the file

Hello, I was led here when I did a search on "Chloramines". This is what has happened. I moved into an apartment. I was cleaning off my stove with Joy dish soap and a scrubby sponge, and tap water. I kept getting a really strong bleach smell. I found out the maintence used a product...

This is probably an incredibly easy one for you, but it's frying me. I'm in AP Chem, and since I'm involved in a lot (excuses, excuses...tsk tsk...), my brain is fried and it's having trouble clicking. My teacher is unhelpful, even hostile, and the book provides no explanations. For example...

What would the chemical name for 12 protons and 10 electrons? This has been bugging me forever!

I'm a Caribbean student in my final year of high school and want to go to a University in the United States. Could anyone give me an idea of how good the engineering programs, notably chemical are at these schools: Florida Institute of Technology Howard University Georgia Institute of...

Hi there! Could anyone help me out with this question? Which steps should I take in solving this question? Chemical cells can produce quite large charge flows for substantial times before their chemicals have all reacted. If zinc is the metal losing electrons under chemical attack, what mass...

Homework Statement What are q and w (in kJ) for the reaction of 22 g of Na(s) and 82 g of Cl2(g) to produce NaCl at 1 atm and 298 K. Homework Equations w=-delta(n(g))* R*T where delta(n(g)) = the moles of gas created during the reaction The Attempt at a Solution First, I wrote...

So I'm having trouble grasping the theories of Chemical bonding and I'm taking Organic Chemistry. I know it's not realistic that I will truly understand it, but I'd like some grasp of it. This book is written by Linus Pauling and I know he is a 2-time Nobel Prize winner, but is this book at my...

I guess straight forward enough question, what would be the resultant chemical if Cs2Se + Sc = ?

1. Homework Statement The standard enthalpy change of combustion of propane (C3H8) is -2220kJ/mol. It requires 1.0J of energy to raise the temperature of 1.0g of air by 1.0K. Calculate what mass of propane needs to be burned to raise the temperature of the air in the balloon by 50K. 2...

Homework Statement The following reaction initially contains [A]o = 0.2150 M and [B]o = [C]o = 0.4150 M. If the equilibrium constant for the reaction is Keq = 2.03, what are the concentrations of reactants and products when the reaction has achieved equilibrium? What is the value of deltaG for...

If you light a match to a mixture of oxygen and hydrogen which then reacts explosively to form water. Is it a chemical or nuclear reaction? I know a chemical reaction is one in which a substance is changed into one or more new substances. A nuclear reaction is one in which a new element...

In chemical reactions the individual elements present in the reactants are the same as in the products of the reaction. Is this true for nuclear reaction? My attempt Nuclear reactants produce new products, and a new element can be made. This means that a new element with different proton and...

Is it possible for atoms of the same chemical element to have different chemical properties? My attempt Isotopes of an element differ from one another by the number of neutrons in the nucleus. They have same number of proton in the nuclei so they have the same chemical properties but not...

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