Reactions Definition and 625 Threads

Homework Statement Why do scientists take the rate of a reaction at the beginning of an experiment? Homework Equations The Attempt at a Solution I would say because the amount of the reactants and present conditions are already known. But, there is a hint that says "think slow...

[SOLVED] magnesium and acid rates reactions im producing an investigation in the reaction between magnesium a solid metal, and acids of varying concentration, pH and temperatures. these variables are to produce results for comparison. however i am unsure about what apparatus would be most...

This problem was proposed to us by our Chemistry professor. Consider a sample of a hydrocarbon at 0.959atm and 298K. Upon combusting the entire sample in oxygen, you collect a mixture of gaseous carbon dioxide and water vapor at 1.51atm and 375K. This mixture has a density of 1.391 g/L and...

Homework Statement How much weight would 5g of CuSO4 5H2O lose if ti were dried at 120 degrees C for 12 hours (i.e. if it were heated to drive off all the water of hydration)? The Attempt at a Solution CuSO4 = 159.61 g/mol H2O = 18 g/mol = 90 g for 5 mols 159.61/(159.61 + 90) =...

Hello, I was wondering if there are any exothermic (or otherwise spontaneous) chemical reactions that release hydrogen, in which the reagents and products aren't strongly hazardous? I know of the reaction of alkali metals with water, but these produce strong alkaline solutions.. Perhaps one...

Recently, we've heard about research into storing anti-hydrogen as a BEC. Atom lasers are touted for their potential to make ultra-precise measurements, including at the quantum scale, because of their small DeBroglie wavelengths in comparison to light. Once, I emailed Dr Wolfgang Ketterle...

Homework Statement Identify the oxidizing agent and the reducing agent and write a balanced equation for each half reaction. MnO4(1-) + VO(2+) ----> Mn(2+) + V(OH)4 (1+) Homework Equations None. The Attempt at a Solution I know how to do these when there is just one atom...

please check my work... urgent pleasezz 1> ZnCl2 [aq] + 2KNO3 [aq] → Zn(NO3)2[aq] + 2KCl (s) 2> Ca[OH]2 [aq] + 2Na OAc [aq] →Ca(OAc)2[aq] + 2NaOH (s) 3> NiCl2 + 2KOH → Ni(OH)2 [aq]+ 2KCl (s)

If CO is released abowe heated Cu when gets CO2. When THAT CO2 is released abowe active C gets CO. When this experiment is done we have double quantity CO . CuO + CO = Cu + CO2 C + CO2 = 2CO Do you know more "growing" quantity reactions? P.s. Sorry for my bad english

In my question i have a square cloth piece of dimension 8m*8m and the mass per area of the cloth is 0.5kg/m^2 .I need to find the reactions at 4 supports.IN first case Cloth is attached in such a way that first i attach one corner to one support then the other corner which is on a diagonal to...

when you're doing RICE tables for weak acid/base reactions, when do you neglect x? thanks for ANY input :biggrin:

Homework Statement All I'm trying to do is translate the cell diagram below into a into a an equation so I can determine which is the anode and which is the cathode. Here is the cell diagram. I know how to balance it, I just want to make sure I'm putting reactants and products on their...

Ok I'm trying to do my chemistry homework and well I'm stuck. I have the first few questions done I'm stuck on question 5 step 3, an I'm not sure the other are correct. I still have no idea how to balance equations and well here we go again with balanceing things... 1. What is the difference...

Write equations for the neutralization reactions that result in the formation of the following salts: lithium carbonate H2CO3 + LiO2 --> LiCO3 + H2O copper (II) chlorate 2HClO3 + CuO --> Cu(ClO3)2 + H2O aluminium sulphate 2Al(OH3) + 3H2SO4 + 10H2O --> Al2(SO4)3 * 16H2O ammonium...

Please click on the image to make it larger. http://img177.imageshack.us/img177/2355/staticsqn5.th.jpg I understand the problem here, what I don't see is how to find the support reactions. Since at each joint we have more than two unknowns I have to find the support reactions. I have the...

Hi. Not directly a specific homework question, but it will help with some of my questions. When the bridge is flat, why is the reaction force from the wall on the bridge angled upwards? Why is it not horizontal, along the length of the bridge? Sorry if i was a little vague. Thanks, Dan.

im wondering what reaction would likely occur 2NO (g) → N2(g) + O2(g) or the reverse 2CO (g) + O2(g) → 2CO2 (g) or the reverse well the first one would occur if it were the reverse because of the high temperatures in the engine, but I am wondering about carbon monoxide, what do you guys think

2CO (g) + O2 (g) → 2CO2 (g) 2NO (g) → N2(g) + O2 (g) what do i have to do, so i have to say the best temperature is at 25 celcius and at 1 atm, how do i figure this out is their a way, or i have to look it up on the internet

2CO (g) + O2 (g) → 2CO2 (g) 2NO (g) → N2(g) + O2 (g) how can i figure out the best conditions for these reactions

Homework Statement 1) Give the resultant fomula for: Cr2+ gets reduced. 2) Will the following reaction occur? Acidified K2Cr2O7 solution is added to HNO3(nitric acid). Homework Equations N/A The Attempt at a Solution 1) I put: Cr+2 + 2e- ---> Cr(s); I have one question...

I can not seem to understand what happens when you react ammonium with certain compounds. For example NH3 + Cu(NO3)2 = ?. How am I supposed to do this?

Are all exothermic reactions chemical changes since they release heat?:confused:

Hello, there something that doesn't make sense to me in the attached problem, P16.3. You can see from the diagram that you will have two reculting reactions, R[SIZE="1"]A and R[SIZE="1"]B. According to what I know from statics, the reactions will be at the same angle theta as the incline of the...

Does anyone know where I can find information on these kinds of reactions such as the possible chemical combinations, reactions and decomposition temperatures, energy stored and released per unit mass, etc? Thanks! -Brendan

I'm having extreme difficulty identifying some precipitates I obtained from combining a solution of Aluminum Nitrate and Sodium Carbonate. The result was an orange precipitate. I have searched high and low (complex ions, decomposition, redox, etc) but I can't figure it out. Please HELP!

Homework Statement The reaction: CO + Cl <-> COCl2 has the rate law: rate = k[CO][Cl2]^(3/2) Show that this rate law is consistent with the mechanism: Cl2 <-> 2Cl (fast) Cl + CO <-> COCl (fast) Cl2 + COCl -> COCl2 + Cl (slow) (i don't know how to do superscript and subscript on...

The question: Balance each of the following skeletal equations by using oxidation and reduction half reactions. All the reactions take place in acidic solution. Identify the oxidizing agent and reducing agent in each reaction. a) Cl2 (g) + S2O32-(aq) --> Cl-(aq)+SO42-(aq) My answer so...

Homework Statement Does combustion reactions always result in water and carbon dioxide being formed, can it just have water or just carbon dioxide, or does water and carbon dioxide not need to be products. Furthermore would Iron(II)oxide(s) + oxygen(g)--> iron(III)oxide(s) be considered a...

HELP! I've been having problems with Chemistry the past semester and a half, but stoichiometry is the hardest thing yet. Here's the problem: Aluminum oxide is formed from the reaction of metallic aluminum with oxygen gas. How many moles of Aluminum are needed to form 3.4 moles of Aluminum...

In my textbook, it had 2Cu2+(aq) + 4I-(aq) -> CuI(s) + I2(aq) How does that work? First of all it's not balanced. It should be 2CuI(s). But how does CuI(s) form. It should be CuI+. The book did say excess 4I- was usd to remove Ag+ since it was talking about back titrations. But the...

Sulphate ions and nitric acid wouldn’t react? Is it because sulfuric acid is a very strong acid, while nitric acids are very weak. So the conjugate base of sulfuric acid which is sulphate ions is very weak and too weak to accept the proton from a weak acid like nitric acid. When you have a weak...

Homework Statement 2. Consider an electrochemical cell as shown, with Zn in ZnCl2(aq) and Cu in Cu(NO3)2(aq), and a salt bridge containing KNO3(aq). The overall chemical reaction is Zn(s) + Cu2+(aq)  Zn2+(aq) + Cu(s). a. How many moles of electrons are transferred in this...

Hey. In class, we did an experiment where we tested the reactivity of alkanes, alkenes and aromatics. One of the tests was a reaction between cyclohexane and bromine water. When we mixed them, nothing noticeable happened. The bromine water stayed a reddish brown colour. I now have to write an...

So I had an exam yesterday and ran into a problem like this. The crate was suspended in such a way that it's CG didn't seem to line up with the given measurements. Also, the tension in the cables around the pulleys are equal (nothing is said about the tension in the blue cable). There's a pin...

hye.. i want some theoratical detail on optical model of nuclear reactions.. no hard mathematical detail. just theoratical explanation of things ... thanx...:smile:

i have to balance a redox reaction that contains the cyanide ion and other stuff. but before i can do anything, i have to assign oxidation states. would hte CN- have oxidation states of C being +4 and N being -5? so then would CNO- have C be +4, N be -2, and O be -2?

hello, i hope someone can help me. i have a few questions. The elements sulfur and chlorine react to give disulfur dichloride according to the equation: S8 + 4Cl2 --> 4S2Cl2. There are 0.5987 mol S8. a) How many moles of Cl2 are needed for complete reaction? b) What mass of S2Cl2 in...

Hello, I am a A level student. I find difficulties with different chemical reactions. Is there any simple way of predicting chemical reactions. Is there any basic principles that can be followed instead of memorising chemical equations? Different chemical reactions occurs in different...

What are the basic principles behind oscillating reactions, I mean, if its known as 'chemical magic' what must it undergo to be such a thing? I've been looking all over the web and havn't been able to find enough information, for example, how the laws of thermodynamics are broken or how it...

I'm with a small doubt let me show for you: I have a solution: KNO3 + Fe(SCN)3 Plus: Na2SO4 (aq) I would like to know if could happen it? ---> NaNO3 + FeSO4↓ppt red + KSCN Or plus: NaOH (aq) Could Happen ? ----> NaNO3+ Fe(OH)3 ↓ppt red +KSCN Thank you Paulo

If I have an equation consisting of n reactants, then the rate would be: Rate = k[A_1]^{p_1}[A_2]^{p_2}[A_3]^{p_3}...[A_n]^{p_n} My question is how do I know what the rate is? Like it gives me a rate, but which reactant has this rate? Zumdahl's chemistry is so ambiguous on this. I don't...

If it is thermodynamically favored for a reaction to occur forward and reverse, does that mean that the standard enthalpy of the reaction is close to 0?

Metal AX BX CX DX EX A - + + + + B + - + - - C + + - + - D...

When a metal displaces hydrogen from a non-oxidizing strong acid, which substance is the oxidizing agent? Thanks :smile:

Energy is neither created nor destroyed in a chemical reactions. Explain where the energy released by the reactions comes from.

I'm having trouble determining the products of these reactions with bleach. I know for sure that all of these reactions do occur because it's part of a lab in which we find the stoichimetric coefficients for the reactants using calorimetry. Since they don't want us to be able to balance the...

Hey I was studying for an upcoming test on Nuclear Technology, and I am unable to do the calculations for this unit. Ill post 2 of the many problems which I can’t do. Calculate the binding energy for an atom of Uranium – 235. My working: Number of: Protons – 92 Neutrons – 143...

Hi. If i was to conduct a few precipitation reactions, is there any reason why an unexpected precipitate will form, or any reason an expected precipitate will not be formed? I've though about things such as added ions in tap water (chlorine etc). Any other things?

Hello, I've been working on some redox reactions for the oxidation of manganese. Question: Write the complete formulae for the redox reactions below: i.) Manganese reacts with nitric acid (V) to form Mn2+ ions. ii.) The Mn2+ ions reacts with potassium iodate, KIO4 to form MnO4-...

Hi I am trying to figure out reactions in the mechanic construction which is here http://img.photobucket.com/albums/v309/Andreii/nalogca.jpg" . Datas of construction are: L1 = 7.1m L2 = 1m L3 = 0.2m F = 2.8 kN = 2800N M = 1.3 kNm = 1300Nm (this is torque) p = 2.5 kN/m = 2500 N/m p...