Reactions Definition and 650 Threads

Homework Statement I basically have 4 sets of solutions which I have to write the chemical reactions for. I already figured out the chemical formulas for the reactants, and just need help determining the final products. I know how to balance, and just need help determining the products...

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:

If you read my ealier post "Acid Reaction" about an experiment involving The Works Toilet Bowl Cleaner and Aluminum Foil. Since I now know what I make when I do something like that, I'm gunna start a search for alternative reactions. I know of ONE kinda of alternative. Which is Baking Soda and...

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...

I am learning, on my own, with the help of textbooks kindly given to me at Christmas by my grandfather and my own experimenting, some more advanced chemistry than what I studied in Grade Seven. Partly as preparation for High School, and partly for my own knowledge. However, I ran across some...

Hey guys, how can I tell whether a reaction is a redox reaction? For example: 2H2O --> 2H2 + O2

hey guys! i am lost with my current unit...redox reactions. i was wondering if any chem whizzes could lead me in the right direction as how to write the oxidation and reduction equations for the following reaction: IO-3 (aq) + I- (aq)--> I2 (aq) Any help would be greatly appreciated! I...

A Very basic and simple thing I don't know for sure: Would you please tell me if an animal(including men) has instinct behaviors when itis stimulated ? Thank you

The reaction A(g) --> B(g) is spontaneous under standard conditions. Which of the following statements must be true? I. B(g) --> A(g) is nonspontaneous under standard conditions. II. A(g) will be completely converted to B(g) if sufficient time is allowed. III. A(g) will be completely...

Hey! Today I had a school visit to the UCL Chemistry department and was shown an Oscillating Reaction unfortunately I wasn't able to get the full 'recipe' to re-do the experiment so can someone be kind enough to write them down. Also! Would someone possibly direct me how to go on about...

I hate stoichiometry. Here's the problem: How do I figure out how many mols to multiply for each product and reactant? I've already been given the other part of the equation. Thanks

As I understand it, it's all atomic material in the accretion disk of a big black hole, with very high orbital velocities and high density. However, the the disk is quite flat, and cooler than one would think with the velocities involved, because the material is swirling in smoothly, with...

I need help finding reactions for a fixed cantilever. total length is 16ft and its fixed on the right side. The loads on it going from left to right. 2000 lbs at the end of the left. 1000 lbs 10ft from left. There is one support for the cantilever and its where A is at which is 6 ft from left...

Hi, I was doing a question on elimination reactions of haloalkanes. Could someone help me out? The question: "3-Bromo-3methylhexane rapidly undergoes elimination when boiled with ethanolic potassium hydroxide. Write the structures of the FIVE alkenes which might be formed, & name them."...

One question posed in a general chem book I have were the trends of a couple of reaction types. They don't answer the question of why, though. Maybe you can help... Identify periodic trends of these rxns: Set 1: H2 + X2 --> 2HX (X are halogens) Ex: H2(g) + Cl2(g) --> 2HCL (g)...

I thought I knew what I was doing but then I checked over some examples and now I'm not so sure... Finish the following reactions and balance the equations. NaOH(aq) + Fe(NO3)3(aq) --> NH3 --> N + 3H H2 + O2 --> 2HO Mg + H2SO4 --> That's all I did before stopping because I...

1st order, 2nd order Rate reactions HELP! I have read the section of my book over and over and studied the practice problems, but I still do not understand 1st order, 2nd order, or 0 order rate reactions. What does it mean to be of any particular order?

So, the average rate for a reaction of type A --> product is given by \text{rate} = -\frac{\Delta A}{\Delta t}. Also, \text{rate} = k \cdot \text{A}. The instantaneous rate for a reaction of that type is \lim_{\Delta t\rightarrow\0} -\frac{\Delta A}{\Delta t} = -\frac{dA}{dt}. Setting the...

The addition of sodium or potassium iodide catalyzes many SN2 reactions of alkyl chlorides or bromides. Explain. I think the reason why it catalyzes many SN2 reactions, has to do with the fact that it is the best leaving group of all the alkyl halides. But why else? Also, is the potassium...

Hello. Can someone please check my work and help me with these problems. I'm sorry it is so long. Predict and balance the following organic equation. -------------------------------------------------------- 1. Ethanol (ethyl alcohol) is burned completely in air C2H5OH + 3O2 >...

I am having trouble understanding this.. If reactions are spontaneous when they create more entropy (disorder), why is it that most spontaneous reactions are exothermic? Such as an exothermic reaction like A + B ---> AB + Energy, AB then has lower energy than the reactants, which also means...

Hi, I was doing a small experiment in class today, which was on Endo and Exothermic reactions. Basically, the purpose of this expieriment was to find out which systems underwent exothermic or endothermic reactions. 3 systems had been tested, and here are as follows... 1) Reaction between Steel...

I had some trouble balancing these using the "ion electron method", ordinarily I'd balance the half reactions (excluding H and O), add H20 to compensate for O, H+ to compensate for H, and electrons to compensate for charge. P4(s) + NO3-(aq) ---> H2PO4-(aq) + NO(g) (in an acidic solution)...

^^Double Replacement Reactions^^ NaOH+CuSO4 -> ? NH4I+AgNO3 -> ? K2CO3+ Ba(OH)2 -> ? KOH+ HI -> ? K2CO3 + HNO3 -> ? (NH4)2SO4+BaCl2 -> ? Na2S+ NiSO4 -> ? Pb(NO3)2+KBr -> ? Fe2(SO4)3 +Ba(OH)2 -> ? Hg2(NO3)2+KI -> ? Don't really get this...Please Help!

Hurricanes grow stronger over warm waters and correspondingly lose strength over cool waters. Hurricanes typically need an ocean temperature of about 80º F, 26º C, to form. This page shows the cooler waters following Hurricane Bonnie caused Hurricane Danielle following in Bonnie's wake...

Hi all, The other day in chemistry class, we carried out several different redox reactions. In one set of the experiments, we reacted potassium permanganate with 3 different potassium halides (KCl, KBr, KI). this particular redox reaction also requires an acidic environment, so sulfuric acid...

This is my first post here, so I'm not entirely sure whether or not this topic warrants a new thread. I've just had a simple idea that I'd like to get some feedback on, from people who have a little more experience in nuclear chemistry than I do. I was wondering if it would be possible to...

I have been reading about fusors. The articles usually refer to aneutronic reactions as though they are fusion. But are they really? For example, the pB11 reaction yields He, but this is some sort of fission isn't it? I.e. we start of with a heavier isotope and produce lighter ones through...

anyone know of any good forums that list Nuclei/particle/atomic reactions in a table. Sort of liket he list you can find in stellar burning(Caroll & Ostlie) but a list of everything(or a lot of reactions)?

Hi there! i feel confused at a question in my homework: Predict whether the following reactions can occur at low temperature a) CH2CH2 + (H+) b) CH3Br + RNH2 c) CH4 + HCl d) CH£Br + (CN-) I don't know what should be concerned, please help me. :rolleyes: