Chemical reaction Definition and 131 Threads

Scenario: Suppose that a pump creates a partial vacuum, which is used to input air (gas) from the environment into a long tube. At a certain point within this tube, diatomic hydrogen and oxygen (gases) are also inputted into the tube. The tube outputs back into the environment. I have...

I wasn't sure whether to put this in Aerospace, but decided on physics in the end. 1.) How do you factor a chemical reaction into the solution for the Navier Stokes equations? More precisely, how can you include the affects of a heat absorbing (endothermic), or heat releasing (exothermic)...

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 ←

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...

[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)

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...

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...

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...

I have a problem.. for a reaction A + B --> C how do i generate 3 coupled differential equations so that i can sole this using MATLAB ? it is given that rate = kAB thnks!

I have trouble trying to figure out what happens to this reaction: NaOH(s)+H2O(l)-> my first thought was that maybe nothing happened but then moved on to wondering wether it ionizes. can someone explain to me what happens and maybe why it does?

I was wondering if someone could tell me the chemical reaction of Baking Soda during electrolysis. According to wikapedia baking soda is sodium bicarbonate witht he formula NaHCO3. And/or could someone explain how i could figure out te chemical reaction of different items during electrolysis...

I am confuse here.Here is another question from my test. Which of the following is a chemical reaction? I.A piece of gold is being heated to melt it II.A ball is being blown III.A piece of paper is burnt IV.A piece of sodium is out into a beaker of water A.I and II B.III and IV...

We lit a piece of Mg so the formula is: 2Mg(s) + O2(g) HEAT-- 2MgO(s) We then dissolved this in water so it would then be: MgO(s) + H2O(l) -- Mg(OH)2(l) Next we blew into the solution which made it: CO2(g) + H2O(l) -- H2CO3(l) Is this all correct? Should I have (Aq) after the...

Q: Can u tell me what are the evidences of a chemical reaction?

Can anyone tell me what's the reaction and product if I mix Hydrofluoric Acid (HF) and Hydrogen Peroxide (H2O2)? HF + H2O2 = :confused:

How can you predict weather or not a precipitate will form in a chemical reaction?

Hello. Can you please help me with this reaction? * KBr + NaOH --> ?* Put KBr in boilling solution of NaOH. What are the products?

Here is my first question. Cl2O + H2O -------> I am pretty sure this is a synthesis reaction becasue it there is non metal oxide and a water. I also know a non metal oxide plus a water forms an acid. I predict this to be HClO3. If that is the correct answer, I can't seem to balance...

CuSO[SIZE="1"]4(aq) + Fe(s) --> FeSO[SIZE="1"]4(aq) + Cu(s) FeSO[SIZE="1"]4(aq) + Cu(s) --> CuSO[SIZE="1"]4(aq) + Fe(s) http://img106.imageshack.us/img106/6140/chem3fp.png Why does the iron plate becomes brown? I have no precise idea, but I think it might be related to the loss of...

What does a catalyst in a chemical reaction? I read wikipedia and the information is not very detailed to satisfy me. It basically says:

Which are the products of this chemical reaction? (NH_4)_2Cr_2O_7(s)+ O_2 (g) --->

hi. i am not chemist, and i am looking for some simple reactions which can happen at room temperature and it creates cooling after reaction, i.e. it absorbs energy. any body know some examples? :confused: thanks.

Hey guys could you tell me if I got the right answer; my teacher hasn't went over this material and it is due tomorrow. Given the following reaction, how many grams of Zn are required to obtain 2.00g of Au? 4CN^{-1}~+~3Zn~+~2Au(CN)_4^{-1}~~-->~3Zn(CN)_4^{-2}~+~2Au (2.00g of Au)(1 mole...

Hi, Is it possible for a substance found in tobacco to cause a delayed chemical reaction that would trigger a feeling of fear and anxiety or alternativly trigger the flight or fight response ? Thanks Ian

Chemical reaction: Cu(s)+2H+(aq)----> Cu2+ (aq) + H2 (g) Cu(s)+2H+(aq)----> Cu2+ (aq) + H2 (g) Do we have this reaction? If yes, is it a displacement reaction? If no, is something about the oxiding power of particles? Could you explain it to me ? Best regards

2 H atoms can form a H2 molecule, releasing energy of 5 eV. However, no chemical reaction occurs when 2 isolated H atmos collide! Explain this curious result using the conservation laws. first of all, i don't know what conservation law to use for this question. 2nd i think i don't have much...

Hi I got a couple of questions regarding the following chemical reaction. First some calculations: 90,0 \textrm{mL of} \ 0,250 \ \textrm{M} \ BaCl_{2} is mixed with 0,500 \textrm{M} of Na_{2} CO_{3} which generats residuum. a) BaCl_{2} \rightarrow Ba^{2+} + 2Cl_{2}^{-} \ (i)...

Hi I got a question regarding chemical reaction: 3 H2O + 2(CaSO4 . 1/2 H2O) ----> 2 (CaSO4 . 2H20) calciumsulfat dihydrat reacting via water. My question is: If I have 1 Kilogram of calciumsulfat dihydrat how much water is needed ? Thanks in advance. Sincerely Fred

hi, could some one please verify what i have done here or tell me where i went wrong. suppose the activation energy for a chemical reaction is E*, i have to work out how the rate of the forward reaction depends on temperature T and concentration. (note: i am given the Boltzmann distribution...

I've always wondered if our feelings have something more deeper then a simple chemical being released in our brain or chemical reaction taking place in our body. Are feelings of love and happiness simply a matter of how much seritonine we have, how much dopamine we release.. etc? Is there...

dear reader, The source of heat in a chemical reaction is the stored energy in an atom. if there is stored energy where is it in the atom?