Chemical Definition and 1000 Threads

Homework Statement 2HCl + Na2S2O3 -> 2NaCl +S + SO2 + H2O Find the order of reaction with respect to S2O32- and H+ volume of 3.0M HCl was held constant at 2ml Homework Equations S2O32- + 2H+ -> S + SO2 + H2O rate = k[Na2S2O3]m[HCl]n (see number 3.) The Attempt at a Solution i just...

Does anyone know the experiment where distinct circular patterns appear to emerge in a liquid chemical reaction? This experiment was covered in my thermodynamics class due to its relevance of order emerging from chaos. All I remember about the experiment is that it was not believed at first for...

Hello I am currently taking a general chem course, and we are studying bonding. I am having trouble understanding why atoms for ex: 2 separate hydrogen atoms have higher energies than a hydrogen molecule. I understand that atoms/ions are always seeking configurations/geometries that will...

This may belong in the Chemistry section but this is a problem from my Thermodynamics class, so I'll post it here and then move to the Chem section if need be. Homework Statement Methane (CH4) is the principal constituent of natural gas and is often used to represent natural gas. Consider...

I am preparing my examination on next week. I face a challenge question on the textbook but it does not provide any answers. Can someone help me? Two questions distribute 10 marks for each. How can I answer point by point to get all the marks in this questions. Many thanks! Consider this...

Help me decide, by suggesting differences and weighing pros and cons of each undergraduate program. I'm in frantic need of help here, and all replies would be appreciated :P

A second- order reaction of the type A + B -->P was carried out in a solution that was initially 0.075 mol dm^-3 in A and 0.050 mol dm^-3 in B. After 1.0 h the concentration of A had fallen to 0.020 mol dm^-3. a) Calculate the Rate constant. b) Solve for the half- life of each of the reactants...

Homework Statement According to the molecular biology book I am reading, when a chemical bond breaks, the energy in the bond is released in the form of heat. which is to say, when a chemical bond breaks the entire atom's speed increases (the atom gains 'heat energy'). But what is...

Hello, I understand that this question may seem rather obvious for some. Nonetheless, it is something that seems to have thrown me off a number of times. When writing chemical equations involving acidic or basic solutions, I know that the acid on the reactant side is written with the state...

PER - chemical reaction Q: A reactor is needed to convert A to R in a liquid reaction. The stoichiomentry is simply A→R and the rate data is given in the table below (P5.21, Levenspiel 1999). For the reactant concentration to drop from CA0 = 1.3 mol/L to CAf =0.3 mol/L, determine, a)...

Hi all, In the solid state physics course I took a year ago we used the chemical potential μ which appeared inside the fermi-dirac distribution function to describe the energy that above it no electrons resides and below it they all reside as the temperature reaches 0 kelvin. Now, when I...

3 CuCl2 + 2Al + HCL →2 AlCl3 + HCL + 3Cu I'm think it's Copper II Chloride because the Copper is a solid, but the solubility rules with the Cl would suggest otherwise. What would be the precipitate here? One other would the net ionic equation have no reaction, since the ions cancel on both...

I think I'm going to aim for chemical engineering, I talked to a guy who now works for bp as a petrochemical specialist, he's retired now due to a car accident, and really think that its the sort of career I'd want to do. From what he said its a sort of mix between chemistry, Electrical and...

When I was in class 8th or 7th , I used to complete and balance equations by logic. For example : 2Na+2H2O ---> 2NaOH+H2 NaNO3+H2SO4 ---------> HNO3 + NaHSO4 But now , presently when I am 14 years , (about to complete 14 though) and in class 10th , I always come across the equations which...

I have read in a lot of places the PAN acts as a very good reservoir of nitrogen dioxide. I can't find much information on why though. All I have found is that PAN is thermally unstable and has a very short lifetime at typical tropospheric temperatures, but becomes much more stable at lower...

The course book tells us that 1 L of gasoline(heptane) has the density of 790g/L which it says, means that, 1 L of petrolium has a mass of 790g. At this point i made the assumption that 1L of petrolium has a 790g of heptane. I did this because 1L weighs 1kg I then used it in my...

I'm in an intro chem class right now and I honestly have no clue where I was when they talked about this BUT here goes... I have several spot tests that I have to come up with the formulas for, I have the reactants just have no clue what the products are. I understand how to balance formulas I...

I'm just wondering if someone can point me in the right direction here.. or maybe I'm just crazy lol. I'm a big coffee drinker. When I go out, I usually grab a coffee and walk around with it in hand. (mall's, convenience stores, book stores, subways and buses etc...) and as expected there is...

What are some dangerous chemical compounds and substances that manufactures put into products that you are aware of and recommend avoiding ? (Is there anything not mentioned here? What are some other toxic compounds?) -Plastic items such as shoes, plastic trash bags contain PolyVynyl Chloride...

Does CN neutral exist? if it will their will be a triple bond but their will be 1 single electron left in the carbon atom now if answer is yes i am all good but if no then why can't 1 unpaired electron remain unbonded?why has it always got to be a "pair" of electrons?

I just submitted a lab report for a TLC experiment, but I just realized that I completely forgot to include the "reactions" section. It's too late to save that grade, but for future reference, how would one go about writing out a chemical equation for a TLC experiment? I had always understood...

1. Recently did a lab experiment involving Barium Chromate. 1) When BaCl2 and K2CrO4 were mixed, I obtained a colourless solution and a yellow ppt was formed. This solution and ppt were split into 3 test tubes. 2) When HCl was added to tube 1, i got an observation that an orangey yellow...

what difference,if any are expected between the chemical reactions of Cl 35 and Cl 37? I'm not sure how to attempt this question =/

First of all, I'm asking here for advice since I've seen how the members of this forum answer in a mature manner (I've read some problems like mine in the forum, however, I've not contributed some). your advice is very much appreciated (please don't mind the different field of study) I've...

Dear all, is the relation between chemical composition of a material and its physical properties a peering relation or a relation of subordination？

I have a environmental engineering problem to do for homework, it goes like this: How many mg/L of magnesium ion will remain in solution in water that is 0.001000 M in hydroxyl ion and at 25 degrees celsius? the answer is 0.1367 mg/L, but i don't know how it was found. to be honest I...

hello, to preview chemical bonds must be considered only the electrons in the last sublevel and not the electrons in all the level? for example my book talking of carbon sp hybridation say that we shouldn't expect it make 4 bounds but only 3, why if the carbon need exactly 4 electron to...

Homework Statement Find the chemical potential for an ideal gas as a function of temperature and pressure. Use the "Gibbs-Duhen relation". Homework Equations \mu=\frac{\partial U}{\partial N} dU=TdS-pdV+\sum\limits_{i}\mu_{i}dN_{i} U=Q+W Gibbs-Duhen relation...

So how do you know when a chemical is an acid or not? I know that an acid is a compound that, when dissolved, yields H atoms, but does that mean than any compound with H in it is (or has the potential to be) an acid? For example: HNO2, I put down that it was Hydrogen Nitrite, but the...

1.The explosion resulting from the detonation of High explosives likes TNT ,RDX ...are they chemical reactions at all ,because the initiation requires detonation waves and no flame or oxidation as such . 2.Detonation is followed by rapid expansion of gases accompanied by shockwaves ...

Homework Statement For a assessment task at school, I have to compare various types of fuel, one of which is diesel. One aspect of the task is to name the chemical formula for each fuel. The Attempt at a Solution I keep finding that the formula for diesel is C12H23. I know that diesel is...

hi there first excuse me for my poor english! can anyone explane what the hell is the 'saturation chemical potential'?! and how can i get it? thanks guys

Hello everyone, first post here. In trying to decipher the meaning of chemical potential, I feel as if at least in the context of the Fermi-Dirac Distribution I have almost nailed it down. As I understand it, the chemical potential is the change in energy associated with the addition of one...

Do gravitational forces discriminate against chemical energy potential? Could the gravitational forces of three substances, equal in density, but differing in chemical properties affect each other differently based on their differences in chemical energy potential? Take two separate bodies of...

I love chemistry and math (have taken through calc 3). I was planning on working in the energy field after I graduate, but I have an honest question: does it utilize electricity and magentism? I, frankly, hated that class. I LOVED physics I, which was much more applicable to me. Should I...

As an experiment I was going to investigate the use of a spectrophotometre as a pH meter by using different chemical indicators which should change colour depending upon the pH of the substance. I know that indicators such as bromthymol blue only experience a distict change in colour over a pH...

\DeltaG = -n F Emax and \DeltaG = \DeltaG\circ + RT ln(Q) When do we use the first equation and when do we use the second one?

Chemical bonding force. Help me understand how chemists describe this force! So one proton has a positive charge. One electron has a negative charge. When we bring them together, that makes one hydrogen atom. The positive proton and the negative electron cancel each other out. Perfect! But...

how does Helicase unwind the dna strands?what is the chemical Process involved?what is the chemical reaction?

Hi, We sell hair products; both synthetic and human hair. Sometimes the customer will cut the hair and then say the hair was too short and request a refund, discount or exchange. We are searching for a safe chemical that we can apply to the ends of the hair so we know if the customer has cut...

If the speed of light were (slightly) different, how would that affect the chemical properties of atoms, if so?

Autochrome is a photography technique which all details forgotten 50 years ago but counted as the best color photograph technique. There are two layers on glass , one RGB Screen and second , a bw emulsion. When RGB filter separates the image , bw all color sensitive layer records the tones...

The reaction between hydrogen and fluorine has an equilibrium constant of 1.15x102 at a certain temperature. Given the reaction equation H2(g) + F2(g) -> 2HF(g), calculate the equilibrium concentration of HF after 3.00 mol of each component is added to a 1.500 L flask. I attempted solving it...

Hello everyone! I am not able to understand Chemical Equivalence? The bookish language is very hard to understand... If someone could explain me the Concept Of Equilvalence, it would be very helpful for me... Thanks, Pranav

Homework Statement 1.) A compound containing only C, H, and O, is subjected to elemental analysis. Upon completion of the combustion, a .4266g sample of the compound produces .5518g of CO_2, and .2259g of H_2O. What is the empirical formula of the compound? 2.) Maleic Acid contains 41.4%...

I am unable to identify it.

I am contemplating between being majoring as a Chemist or a chemical engineer-- and just can't decide. chemistry is initially what attracts me. However-- the APPLICATION of chemistry to a PROBLEM is REALLY what gets me excited, which is what essentially is the definition of an engineer...

I'm interested in philosophers' opinions on a question that I posed in another forum (https://www.physicsforums.com/showthread.php?t=496119). As I say in my latest post, the entire thread was sparked by the comments of the Philosopher of Chemistry, Joachim Schummer: We have no reason at...

Homework Statement When carbon dioxide "dissolves" in water, essentially all of it reacts to form carbonic acid, H2CO3: CO2(s) + H2O(l) <--> H2CO3(aq). The carbonic acid can then dissociate into H+ and bicarbonate ions, H2CO3(aq) <--> H+(aq) + HCO3-(aq). Consider a body of otherwise pure...

I'm considering leaving my job and enrolling in the chemical engineering program at University of Waterloo. I'm in my early 30's and employed in a Senior I.S. position. I don't have any formal post high school education. Mostly programming and database courses. My wife is going to support us...