Chemical Definition and 1000 Threads

Homework Statement For the chemical equilibrium N_{2(g)} + O_{2(g)} \rightleftharpoons 2NO_{(g)} , the following values were found for the constant Kc (chemical equilibrium constant), at the indicated temperatures: (The table is attached as an image) Table in text format: Temperature (K)...

Homework Statement All of a sample of Mg(OH)2 was converted to Mg3N2 by: Mg3N2 -> Mg(OH)2 Give the mole ration of Mg(OH)2 to Mg3N2 in that reaction. The Attempt at a Solution Well I'm having trouble just making heads or tails of the equation in the first place...

There are 2 parts to this question: 1. If limestone (calcium carbonate) and clay (assume aluminum silicate) are mixed together and heated then the result is cement. Cement is a mixture of calcium oxide, carbon dioxide, aluminum oxide, and calcium silicate. These bags can be purchased at any...

My friend needs to clean his head light lenses and they are plastic , does anyone know a chemical that will dissolve plastic or clean the lens to cut the oxidation , i could buff the lens but i would rather use a chemical, I was thinking along the lines of lacquer thinner.

I think this chemical balance is correct but I'm not sure if I am writing it right or not. Any help?

Homework Statement Ozone can be prepared from molecular oxygen by subjecting oxygen to an electrical discharge. The standard free energy of formation of ozone is +163.4kJ/mol. a) write the chemical equation for the formation of ozone. b) what sign of the entropy change for this...

Homework Statement 2. The attempt at a solution The way I understand, they would all dissociate like this: NaCl(s) --> Na(+) + Cl(-) I'm pretty sure the Cl(-) is a Bronsted base, or anything with a -ve charge, but as for the solution as a whole being basic, I'm not sure what they're...

This website gives a break down of the ten most abundant elements from spectrum analysis of the sun http://imagine.gsfc.nasa.gov/docs/ask_astro/answers/961112a.html" Presumably this result is only valid for the surface/near surface of the sun. If there were any heavier elements present...

why smaller the packing fraction higher the stability of nucleus ?

Homework Statement When copper metal is placed in a beaker containing a solution of silver nitrate, a reaction occurs which can be represented by the following equation: 2AgNO3(aq) + Cu(s) -----> Cu(NO3)2(aq) + 2Ag(s) a) Give the net ionic equation to represent this reaction occurring...

is KMnO4 the molecular formula for Acidified dilute potassium permanganate

Hey guys, I nd sme help with sme chemical equations that I hve. I've tried different sources but they seem to be contradicting each other. Please help. 1. When Mn(NO3)2 is heated, MnO2 and a brown gas J are formed through decomposition. What is gas J? I tried to cancel out the similar...

I'm interested in oscillating chemical reaction, as Belousov-Zhabotinsky one. Does it oscillate "forever" or it relax to a macroscopical stationary state? Ll.

Homework Statement What is the coordination number of [Pt(en)3](ClO4)4Homework Equations The Attempt at a Solution I know the method to solve this one, I just have no idea what (en) is and if it is bidentate or polydentate (I've already tried monodentate and it was incorrect). Even the name of...

As you can tell from the title, I am curious to the advantages/disadvantages of majoring in Chemical engineering or Electrical engineering in regards to nanotechnology, as well as other job opportunities if nanotech doesn't fall through(currently a freshman in college). I recently read a thread...

I'm just graduated from university. Now, I want to take graduate studies. But, I'm still confuse to choose major in my master degree. My undergraduate studies is chemistry (natural science), but some person told me that I must take chemical engineering to support my future. I don't understand...

like mixing household chemicals together to get a cool reaction to help my brother for the science fair? please don't say baking soda and vinegar half the school is doing that for a volcano.

Homework Statement Consider the charging of a lead-acid batter at atmospheric pressure and room room temperature. 2PbSO4 +2H2O -> Pb + PbO2 + 4H+ + 2SO42- How much electrical work must be provided to produce one mole of lead? The Attempt at a Solution We're given the values of Gibbs...

sorry if this has been asked before, i did a search and couldn't find any results. Explain fully what happens when H^+ is added to a mixture containing BaCrO_4(s) and CrO_4^2^-. The overall equation of ions in this experiment is...

I will be attending college this fall as a freshman, so I'm trying to decide on a major. My first choice of a major was chemistry because I had planned on going to medschool, but now I am also considering majoring in chemical engineering. What are the major differences between the two...

Homework Statement Suppose the reaction system UO2(s) +4HF(g) <-> UF4(g) +2H2O(l) is sealed in a container and allowed to equilibrate at a particular temperature. Explain what happens to the nature of each substance if you: a. remove some UO2 from the system b. remove all UO2 from the...

What is the chemical formula of pure milk? What is the chemical reaction taking place when milk combines with salt? thanks in advance.:smile:

Hello, I am sorry to ask a relatively unrelated question. I need to know if the chemical potential of fictitious atoms like hydrogen used to saturate the dangling bonds is different from the chemical potential of hydrogen in common chemical potential tables. Regards, Sarah

Homework Statement Sorry if this kind of question is atypical for this forum. I'm trying to understand the physical concepts involved in my chemistry class. My homework is covering lattice enthalpy, and to get the lattice enthalpy of an ionic compound using the Born-Haber Cycle...

So I got back a test and one of the questions was the following: A person is running at a constant speed on level ground. Chemical energy in the runner's body is being transformed to other forms of energy: most of the chemical energy is transformed to? a. thermal energy b. potential energy c...

Hello Guys, I'm searching for the best physical definition for the "Chemical Potential" as an energy, what I know is that it's a constant set through Lagrange multiplicands which is set to sustain the number of particles. Actually I'm still not convinced with that, it's an energy, and should...

what is the chemical formula of amino acid?

how water extinguishes fire? i mean..what is the chemical reaction taking place when water combines with fire??

Why do some chemical reactions release energy, while other chemical reactions absorb energy?

Is chemical engineering ridiculously hard? If i really enjoy chemistry would chem engineering be a good choice?

Homework Statement The equation for the reaction of Al and KOH solution The Attempt at a Solution Al\rightarrow + KOH\rightarrow Al(OH)+ K I seriously don't know if this is the correct equation to represent the reaction between Al and KOH solution.

Homework Statement does anyone know how i can differentiate a strong acid from a weak acid and likewise for a strong base and a weak base based on its chemical formula? Homework Equations The Attempt at a Solution

hi please give some me insight into the working of a chemical clock and its relation with entropy i don't really know if this is has anything to do with physics but please do help

Homework Statement Hey all, I'm new here, so hello to all of you. Question: "Calculate the solubility of PbI2 in .300m AlI3 (PbI2 - Ksp = 2.0x10-30)" So I'm not really sure how to do the symbols and such, but that's a try. Now I'm seeing it two ways. One: Right a disassociation equation as...

I have been planning on dual majoring as a nuclear physicist and also a chemical engineer. I was going to be the chemical engineer until I could get a good job as a nuclear physicist. This changed though when I started learning about quantum mechanics and I realized how much I enjoy it. I like...

4 middle school students,tell me wat i need, and its better is a interesting chemical experiment safty!

Are you interested in earning $100 to share your opinions? We're looking for Chemical Engineers, age 22- 35 to participate in a 1 1/2 hour discussion. We will be hosting focus groups in Houston, Chicago, and Philadelphia, and we need members of AIChE as well as non-members. The...

Homework Statement 1. Li + H2O -> 2. K + H2O -> 3. Na + H2O -> 4. Ca + H2O -> 5. Mg + H2O -> 6. Cs + H2O -> 7. H + At -> 8. Na + At ->Homework Equations The Attempt at a Solution 1. 2Li + 2H2O -> H2 + 2LiOH 2 & 3: Same for 1. Others I have no idea how to do. I was NOT taught these and she...

Homework Statement It is a chem equilibrium question, involving the ICE table. The following reaction: S2(g) + 2H2 (g) ←→ 2SH2(g) takes place at high temperatures. If the initial amount of H2 and SH2 is 1.75 g and 1.95 g, respectively, and at equilibrium the amount of S2(g) is found to be...

I have to graph changes in energies. And I have a question - so I have a battery that supplies power to a motor and some sensors. I have to assume it starts with 36000J of energy (chemical energy, right?). Then, pretend a motor uses 22J and shuts off. Now I would have 35978J of chemical left...

an equilibrium exists between chromate ion and the dichromate ion when potassium chromate is dissolved acid. the net ionic equation describing this reaction is given in the follwering equation: 2 CrO4^2- (aq) + 2 H3O^+ (equilibrium symbol) Cr2O7^2- (aq) + 3 H2O (l) a student studying this...

Hi there. Is the chemical energy in melocules stored in the chemical bonds between the atoms?

I have a project for my chemistry class about industries. Choose one of the industries listed below to research. automobile cleaning clothing manufacture computer construction cosmetic dental farming food preparation food processing fuel law enforcement...

Hello I have a bachelors in chemistry and am planning to do a masters in chemical engineering. I was just wondering what the prospects would be of obtaining an engineering job without the bachelors in engineering? I am in Toronto if that matters. Thanks!

HELP NEEDED Sealing chemical Reaction in furnace(Beng mech Eng. project) Hello everyone, I had posted a similar thread earlier, got a few responses, but nothing enough to drive me out of my problem, even my project supervisor at Uni of Notts is confused...

Homework Statement How would you know wheather its a chemical change or physical change Homework Equations The Attempt at a Solution

Hey. I've been trying to find out as much as i can about careers in chemical and process engineering by searching the forums, however it seems that most engineers who post here tend to be mechanical engineers. Are there many people here who are chemical engineers, or who have worked in the...

Homework Statement Calculate and tabulate the fractions of the total mass of the Earth which would be accounted for by O, Na, Mg, Al, Si, S, Ca and Fe under the following hypothese. i) All the elements above are fully oxidized, except that no S is accreted and the Fe is entirely metallic...

Hi, I am a junior chemistry major. I am interested in studying physical chemistry or possibly chemical physics in grad school. I've got a couple questions: 1) Would a physics course in optics be good to take as an undergrad? I thought it might be helpful to learn about lasers, spectroscopy...

Hi everyone, i wonder if anyone has an idea how to attack chemically an amorphous carbon film. Is it possible to completely dissociate an amorphous carbon in a chemical solvent? thanks for your help