Reactions Definition and 650 Threads

i can't figure out how to calculate this. Please help! How many grams of 6.000 wt% aqueous HF are required to provide a 50% excess to react with 10.0 mL of 0.0236 M Th4+ by the following reaction? Th(4+) + 4F - → ThF4 (s) I found the molarity for Th(4+) to be 2.36*10^-4.. I'm not really...

Homework Statement Find the product of each reaction Homework Equations Butanal (http://www.chemspider.com/Chemical-Structure.256.html?rid=e530204e-5d67-41a8-88e9-fc8e0ffcf41b), reacted first with bromobenzene...

Hello, Would putting liquid paraffin (C_{n}H_{2n + 2}) in either a polyurethane or polyethylene bladder (such as a camelbak hydration bladder) create any compounds that have a higher toxicity than that of paraffin itself? I know that all petroleum distillates act as weak solvents and I'm...

Hey guys, in a reaction like 1A + 1B <-> 1C + 1D, which starts with 1 mol of each molecule (A,B,C,D), how can I find out how many mols will be remaining in equilibrium state? knowing that the Keq is equal to 4

If an E2 reaction occurs on a primary halide, is the 1-alkene the only product? or can some kind of shift occur to the 2-alkene? I feel that only the 1-alkene would form but can't confirm this. My textbook only mentions that SN2 reactions are dominant when primary. Thanks.

I know this is going to be a very simple question to ask so I hope to not bore anyone. I am having trouble with redox reactions. Not so much in completing them but in understanding them. The problem that I have is telling when something is reduced or oxidized. I know if it gains electrons...

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...

Hi! I need an help on short thesis I'm writing for an exam. It is about artificial radioactivitiy, and my professor has told me to treat the partial waves formalisms to calculate the cross-section of nuclear reactions. He told me to start that section with: "Cross section is the most...

For example, on this website http://www.chemguide.co.uk/physical/redoxeqia/combinations.html in the second diagram from the top, it shows that *if a high resistance voltmeter is placed between two pieces of metal, zinc and copper, the zinc metal will accumulate a build up of electrons.* Then...

a. CH4(g) + 2O2(g) ----------> CO2(g) + 2H2O(g) I need to determine which is reduced and which is oxidized, I already know that C in methane is Oxidized. O2 is reduced but how can you determine that?? I know it has to do with electron transfer but I just don't see it

Homework Statement I am having trouble trying to find out if things react with each other or not. I don't really know how to read the reactivity series well :confused: Homework Equations Question 1: a student was given a beaker of an unknown ionic solution to identify. she conducted the...

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...

Chemistry: Reactions in Solution, But Not In Solid Form? Homework Statement "Calcium chloride and sodium carbonate are two ionic solids. If the solids are placed together, nothing seems to happen. However, if they are mixed in water, the following chemical reaction occurs: * See relevant...

I'm writing about emerging technologies the richest people on Earth would be thrilled to have. In fact, its already hit the noosphere. Now I'm writing another appeal to investing in people (this one focusing more on biopersonal impacts than technosocial development) and wish to publish it with a...

Hi, My textbook is being a bit ambiguous and indecisive, in terms of properly defining something. Can oxidation-reduction reactions produce ion compounds and molecular compounds? Thank you

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 =/

I am currently working on an un-named project and have hit a road block. I have a very shaky background in chemistry and, while I can do the research myself, I don't know where to sart. I am trying to satisfy a chemical equation which (if my terminology isn't as rusty as i believe ) is...

I have these two homework problems, as well as solutions. What I do not understand is why the solution for one is not the solution for the other. First problem: A sample consisting of 1.00 mol Ar is expanded isothermally at 0 deg Celc from 22.4 dm3 to 44.8 dm3 reversibly. Calculate q, w, delta...

Here is a link to the problem: http://img62.imageshack.us/img62/374/frameow.jpg" I am trying to find the support reactions at A and B. I separated the frame at the hinge(call it C) into two parts and took the moment equation about point A. This gave me: \SigmaMa = -60(25) - 62.5(12.5) +...

Homework Statement The mass of the homogeneous flat plate is 50 kg. Determine the reactions at the supports A and B. I've attached the diagram. The Attempt at a Solution I know I will need to find the center of mass. I don't remember exactly how to do it, but I found the centroid...

On an exam I got this question: [PLAIN]http://img849.imageshack.us/img849/5732/spontaneity.png but at the time I had no idea how to answer it. I still don't really know if I can answer it. I can explain it mathematically with the equation: ΔG = ΔH - TΔS seeing as a spontaneous reaction...

Why do certain elements (particularly transition metals) possesses varying charges in different reactions? For example: Iron (Fe), is known to exist as Iron2+ and 3+.

Hi guys! How can one calculate your reactions at both ends of a simply supported beam if one reaction is higher than the other one? Example: Support A (one end of the beam) is 100mm higher than Support B (other end) and there is a 22kN/m UDL distributed along the length of 2.5m Does your...

Homework Statement Is the reaction for the production of ammonia an endothermic reaction or an exothermic reaction? Explain. Homework Equations n/a The Attempt at a Solution I know that the production of ammonia in the Haber process is indeed exothermic and that the backwards reaction (NH3...

i have 1-100 true n false and I am complate stuck on these following please help me fast i have a exam tomarrow please! following are True or False.. please someone I am new to this site 37. gravitational forces are greater then electrical forces? 38. nuclear forces must be stronger...

Just a quick question, when calculating C1V1 = C2V2, do I need to account for Mole Rato? Say that C1 had 1 moles required in reaction as opposed to C2 which required 2 moles, would I just multiply C2 by 1/2?

Suppose you have a can (like a spray can) in a vacuum. You poke a hole in the can and the pressure from the can pushes it to the right. Now suppose you have a vacuumed can within a pressurized container and then you poke a hole in it. Which way (if at all) does it move? I know this is sort of...

I am designing a Rube Goldberg machine and I am trying to incorporate a nuclear reaction. I do not want to split an atom or anything, but I do need something other than a smoke detector or a microwave to use. Is there any household or common object/device that uses a nuclear reaction? :confused:

I have a little bit of an issue. I am trying to find the reactions on this truss. I know there are x and y at the first and y at the 2nd on the truss. But when I create my moment, do it take the 2500 lb into effect for the rope across the top and side as well? or do i omit those? My...

Homework Statement Use half reactions to balance the following redox reactions and underline the oxidizing agent m) Zn + HNO3 --------> Zn(NO3)2 + NH4NO3 + H2OHomework Equations Not applicableThe Attempt at a Solution I would usually start by breaking down the equation into half reactions, but...

Homework Statement Use half reactions to balance the following redox reactions and underline the oxidizing agent. a) Cl2 + ClO3{-} -> ClO{-} (acidic) {} is the charge e{-} is electrons Homework Equations Not applicable The Attempt at a Solution Well I tried to separate and...

Homework Statement Homework Equations Sum of forces = 0 Sum of moments = 0 The Attempt at a Solution Hey everyone, this problem has me stumped. I'm only just starting to study solid mechanics now and I need some help with this problem. Any help would be greatly appreciated...

Hi, I have a question about redox reactions. What actually causes the transfer of electrons to occur between elements? For example, in the reaction between aqueous Ag+ and solid Cu, why is it more energetically (?) favorable for copper's electrons to transfer to silver, thus creating blue...

Homework Statement 1. Give a calculation for the approximate temperature needed for nuclear reactions in the sun? 2. Give a calculation for the period of two stars in the shortest possible orbit? The Attempt at a Solution 1. Our class just covered the first chapter of our book 'Stellar...

Homework Statement 1. Suppose you are told that a star has been observed with a UBV color index of B-V=1.6 and that interstellar reddening is negligible. In addition, its apparent visual magnitude is 9.8. Detailed spectroscopy also reveals that the star has all the characteristics of a main...

When one atom chemically combines to another atom is it totally determinate? I mean if one atom gradually approaches the other would the reaction occur at exactly the same place or does HUP play a part and give it some randomness? I think there is a known answer to this but I cannot find it...

Salam o Alikum WHY solvent effect the SN2 reaction as it effect the SN1 reactions where, it help in generation of carbocation?Although i know that a polar solvent like water can act as nucleophile but if in SN2 type of reaction solvent which can't act as nucleophile as their is STRONG...

I didn't use the format because my question is more general. I want to be able to understand the logic so I can apply it where appropriate. We're finding forces (and whether they're in tension or compression) using the Method of Joints and Method of Sections. I don't understand why...

Homework Statement a horizontal beam has a pin at 0m(point A), a 90N (-90i) force at .2m(point B), a pin at .4m(point C) and a 180N (-127.3i + -127.3j)at (45 degrees) force at .6m(point D). the pin at point A is attached to a vertical wall with rollers, the pin at point C can't move. The beam...

Homework Statement H_{2} + O_{2} \rightarrow H_{2}O Homework Equations The Attempt at a Solution Well, my classmates insist that H= +1 and O= -2 (in the products side) so, my Hydrogen will be my Reducing agent because it underwent Oxidation and my Oxygen will be my Oxidizing...

Homework Statement Please help me in chemical equations of redox reactions. Here are the problems. 1. Mixing potassium dichromate, K2Cr2O7, and sulfuric acid, H2SO4, in a test tube. Then, add hydrogen peroxide, H2O2, drop by drop, shaking the solution after every drop. Add until a change...

Homework Statement The reaction 2NO(g) + O2(g) ---> 2NO2(g) is second order in NO and first order in O2. When [NO] = 1 M and [O2] = 1.9 M, the observed rate of disappearance of NO is 0.00017670 M/s. I have already found the value of the rate constant to be 2. I found that the units of the...

When 2 ionic solutions are mixed and the reaction gives a sparingly soluble product, it is possible to write an ionic equation for the mixing of the solutions.

We do know that in the process of chemical reaction, atoms or molecules come closer, form bonds and get stabilized by sharing or donating electrons, thus filling the valance shell of atoms. But why do they want to get stabilized?.

Homework Statement Fission reaction: 10n + 23592U --> 14156 + 9236 Kr + 3(10n) Why in the world is there a neutron on the left side of this rxn? Why not just reduce the number of neutrons on the right side to two?

I need help with the reaction. I know the double bond O goes to single bond O-H I'm not sure what else to do. Thanks

Not particually a paradox, just liked the word play. Anyway... The definition of a redox reaction is a reaction with both reduction and oxidation. As we know, oxidation is loss, reduction is gain of electrons. So redox is a reaction with both loss and gain of reaction. Does it follow that...

Hi there, I was just wondering about this point, why do some chemical reactions produce bright light (and even sound) whilst others do not? For example: in the rapid oxidation of Magnesium in air after given the necessary activation energy, a bright white light is emitted. However, in many...

Can anyone tell me how to find the reactions of this structure? If not by summing forces and moments, then how? I'm thinking it's indeterminate and assumptions have to be made.

The more reactive an element, the stronger bonds it forms, because the same energy must be put into that bond to separate them that was put out due to the reaction. Most of the elements we are made of, in pure form, are reactive correct? Carbon and oxygen have very high electronegativities, and...