Chemical Definition and 1000 Threads

Does anybody know much about, or know where I could find out about, diamond colloid? It is the most energy dense chemical fuel, correct? And if that is true, that would mean it can react to expend the most energy per ounce of any chemical reaction, right?

What is the chemical formula for oleic acid?

2 ml of 15M Nitric acid was added to copper bromide(CuBr) and gently heated until a black substance was formed, copper oxide(CuO), and was completely dry. There was .93g of CuO formed in the reaction. The CuO was formed from the decomposition of the copper nitrate produced by the reaction of...

I am currently thinking of applying to the university of manchester and imperial college in my Ucas form. However, i didn't take physics in my AS or A-levels. Although they offer ABB/AAB for Chemical engineering without mention of physics, i am concerned. I currently take Maths, Chem...

I have two bottles of chemicals. I know that one bottle is Copper (II) Sulfide, and the other is Copper (II) Sulfate Pentahydrate. One bottle contains blue crystals and the other bottle contains black crystals. Problem is, the bottles aren't labeled, so the question is how do I determine...

We first heard of the contagions spread by human waste, dead bodies and mosquitoes around New Orleans. Next came the threat of seepage by poisons, petrochemicals and other toxins into its water. What do you think is the possibility that the chemicals leached into the flood water actually...

Does anyone know any free programs that can draw molecular structures, or at least represent them in line notation? Or in 3D ?? :redface:

This question is probably simple, but I am just double-checking for chemistry's sake. Classify each of the following as a physical or chemical change. a. dissolving salt in water - chemical (Is this right?) b. boiling water - physical c. cooking an egg - chemical d. rusting of iron -...

there are 2 Questions in which they seem like they should have the same answer, but apparently they dont, which is confusing. 1. 2NH3 <--> N2(g) + 3H2(g) initially, NH3 is added to empty flask. how do rates of forward and reverse reactions change as system proceeds towards eqm? answer...

hi, im new to this forum, i have used it quite a lot for physics, however i need some help with chemistry and was hoping someone could help me work out a few equations i need for a social relevance essay. I am doing the essay on forensics chemistry; particularly how gunshot residue is detected...

Chemistry is not one of my strong subjects, so please bear with me. Here's one of the questions we were given as homework, of which I'm having some trouble with. I'm sure it's pretty elementary, but the problem is that I'm unable to express the answer clearly enough. Question: The reaction...

As a chemical engineer how useful would FORTRAN be to me. It is listed on the University of Florida's ChemE homepage as a good language, but I have heard it is on its way out. All Comments Welcome

Help me understand please 0.6 mole of O2, 0.8 mole of CO and 0.5 mole of CO2 are added to a 2-L container. The system is heated and 0.15 mole of CO2 is formed. Does that mean that on top of the initial 0.5 mole of CO2 an additional 0.15 mole of CO2 is formed or does that mean that in total...

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.

I must name these substances a) [Cu(Cl4)]^2- b) Ag(NH3)2+ c) Cu(NH3)4SO4- d) Al(H2))6Cl3 Now I have read the rules regarding naming these, -Within the brackets the order- negative-charge, neutral and central. -The number of each ligand is indicated by greek prefixes -oxidation...

I recently scoured through Amazon to find a somewhat decent chemistry book, and these are the list of books I am interested in at the moment: Advanced chemistry 1,2 by Phillip C Matthews of Trinity college Dublin Nature of the chemical bond by l.Pauling I got the first 2 books by...

why can't the chemical formulas be altered? I was asked this question, and my answer was because if you alter the formulas you're dealing with totally different chemicals, and therefore a different equation. Seems like such a simple question, but its surrounded by harder ones which makes...

Interesting paper: Enhancement Mechanisms of Low Energy Nuclear Reactions Gareev F.A., Zhidkova I.E. ... 1. Nuclear processes have characteristic energies ≈ 1 MeV, whereas chemistry has a few eV per atom, molecules have a part of eV. The inner atomic shells are bound with many keV in the...

Do you know any free software to draw elements or simulate chemical reactions ? I like the free ones :biggrin: Thankyou

Working a problem in Greenburgs "Advanced Eng. Mathematics", #8 page 170. Two substances w/ concentration x(t) and y(t), react to form a 3rd substance w/ concentration z(t). The reaction is governed by the system x’+ αx = 0 z’= βy x + y + z = γ solve for x(t), y(t), and Z(t) subject to...

Some of you are aware of the fact I have already prepared two chemical calculators (see signature). I am planning to extend the line of programs and I have several ideas about what could the next calculator do. However, before starting work I decided to do a quick poll: What type of...

I personally deem Vogel's to be a standing authority on Pratical organic chemistry, inorganic analysis and the quantitative chemical analysis text is superb. I was told to get Harris (analyt chem) but soon realized after my first course in analyt chem that book will be somewhat useless...

I am trying to understand the chemistry cell thoroughly. 1.If there is only a copper wire connected to a multimeter, there should be no voltage, isn't it? 2. For the set up of a zinc electrode and a copper electrode, will I get a larger voltage by changing the electrode? Such as a more...

i read that Synthetic Pyrethroids are referred to as the "New Age Insecticides". Can anyone explain what are the some of the major chemical components of these insecticides?

There are several substanecs different only in a chemical group linked to the same opsition for all those substances. how can i know which one reacts fastest ? ie , OH-R, ON_2-R, O_3P-R, O_4S-R... Thanks

I am encountering a phenomenon that I am at a loss to explain. I am finding a distinct odour of garlic in ice cubes and drinking water in my home and at my work. I am wondering what the volatile chemicals in garlic are that might be similar to something in the water. It happens in two...

Is there a chemical that "undos" highlighters(yellowish thing)?

Hi all, I have a question about the chemical potential \mu from statistical physics: Why is the chemical potential \mu for a photon gas (or phonon gas) zero? Thanks in advance Edgardo

I need help with the following questions. If you don't have time to solve both then please do the 2nd one. The answers I got are 1a .5 1b 1 1c not sure how to do it 2a 3.86 2b 2.42^13 Are they correct? 1) For the following reaction 2SO2 + O2 <_-_-_-_-_-> 2SO3 What...

Book, Help ! Hey there ppl, I'm an undergraduate ChE and most of the time i have problems with books. My problem is that when i read a paragraph and want to continue it with making some excersises, i find it hard to figure out which excersises belong to the paragraph i just read...e.g...

Is oxygen gas a chemical element? Is oxygen atom a chemical element? The oxygen element in the periodic table actually refers to an oxygen atom or oxygen gas that exist naturally in our surrounding air/atmosphere? Thanks to anyone that help and try to explain.

I a have a broad background in chemistry so I know the basics. I was looking at a tanning product and this was the guy's big claim "All these ingredients have high pH levels of over 6! What does this mean? A pH of over 6 is the COLOR ORANGE!" Now, I wasn't aware that pH could change the color of...

Hi guys, I have a quick question on this checmical, Polybutene. At my plant, we are having a pigeon problem in one of our compressor buildings. We requested some samples of some bird "deterrent" products. One that came back was this gel type stuff. I noticed that it was 97% Polybutene...

Hi, i woud like to ask one thing... Discuss the idea that the standard of living in a society might be measured in units of kJ/person available in that society. ...just instruct me how to do this question i mean what answer they are looking for...

Another good reason to go to ACS Meeting in San Diego next week. Visit the Elsevier booth at: American Chemical Society - Spring 2005 Booth # 402 March 13-17, 2005 San Diego, California To enjoy these special offers: Discounts on an extensive collection of Elsevier/Academic...

H2(g) + I2(g) = 2HI(g) T = 731K K = 49.0 If at equilibrium 0.171 mol H2 and 1.571 mol I2 are present in a 1.04 L vessel, what is the concentration of HI in the gaseous mixture in moles/liter ? Ok I tried doing this question by setting up a mole ratio first...

Can someone please explain to me how to calculate chemical shifts only given a few constants? For example the compound is as follows: a benzene ring except in positions 1 and 4 there is an OCH3 group. given only the values of: alkane CH3 = 0.9 alkane CH2 = 1.3 alkane CH = 1.4 O=C-CH3...

info of different chemical components? are there any places where i can get the info of chemical properties of different chemical components? 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...

https://www.physicsforums.com/journal.php?s=&journalid=13790&action=view Read the exctract in my journal and look at the site of the beautiful woman that discovered this bound with computer simulation... marlon

HI While working on some chemical kinetics problems, I came across the statement, the fraction of activated molecules is 10^{-15} in a problem where some other constants were also provided and the half life was to be found (for a first order reaction). My specific query is: Is this...

The rate constant for a certain reaction has the units concentration/time. What is the order of the raction? A. 0 B. 1 C.2 D.3 My reasoning: K = [A]^m x [B]^n Since the concentration/time is to the power of one, both m and n must be one i think which give an overall order of...

Does anyone know if confectionary sugar, is the same thing as regular sugar (ie. sucrose C12H11O11)? What about the chemical compostion of sugar substitutes, like 'Equal' or 'Sweet and Low'?

Why are all Chemical Engineering books at least a $100 or more, while Applied Physics books go for around 20-30 bucks a piece?

Hi! In a molecule, let's say NaOH, the Na is a positive ion and the OH a negative one. How can a molecule, OH, be negative. The binding between the O and the hydrogen is, I think, colvalent. But doesn't that mean that the OH-group is charged? And how can that group binds to the other and be NaOH?

Hi again Here's another problem: When N_{2}O_{4} is allowed to dissociate to form NO_{2} at 15 degrees C at an equilibrium pressure of 1 atm, K_{p} = 0.41 for the reaction N_{2}O_{4}-->2NO_{2}. (a) If N_{2} is added to the system at constant volume will the equilbrium shift? (b) If the...

Hi everyone Here's the problem: The decomposition of ammonium hydrogen sulfide, NH_{4}HS(s) ----> NH_{3}(g) + H_{2}(g) (this rxn is reversible) is an endothermic process. A 6.1589 gm sample of solid is placed in an evacuated 4 litre vessel at exactly 24 degrees C. After equilibrium...

Hello, I just need some help on these questions and some explaining. I need help writing the condensed word equation for these chemical equations: A) Li + Hg(ClO)_2 \xrightarrow~Hg + LiClO Maybe: Lithium + Mercury(II) Chlorine oxide ------> Lithium Carbonate B) C_8H_1_8 + O_2...

Hello, I just need some help on these questions and some explaining. What to do: > Balance each of the following chemical equations. > Identify the type of chemical reaction (Decompostion, Combustion and Synthesis) > Write the condensed word equation A) Li + Hg(ClO)_2 \xrightarrow~Hg...

i'm applying to take undergraduate chemical engineering and i was wondering if there was anything i needed to know to prepare for it. Chemistry is a very interesting topic to me. I'm currently reading "History of Analytical Chemistry" by Ferenc Szabadvary. Does anyone know of any other good...