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PhysicsForums A question about water  
10:16 31-Aug-06   [Replies: 3, Views: 187]    By: Unnamed
hydrogen is a combustible substance and oxygen is a supporter of combustion. but water extinguishes fire. how is that?...
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PhysicsForums Weak Acids and Strong Bases  
18:37 29-Aug-06   [Replies: 5, Views: 523]    By: Unnamed
If the conjugate base of a weak acid ends up being determined as a weak base by dividing the acid dissociation constant by the ion product of water, how can this be? My book had an example, but goe...
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PhysicsForums Dissolving Ethanol  
18:36 29-Aug-06   [Replies: 4, Views: 144]    By: Unnamed
When ethanol dissolves, the individual molecules stay intact right? It doesn't dissolve like a hydrohalic acid in which the polar bond actually breaks?...
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PhysicsForums help with a problem please?  
13:05 29-Aug-06   [Replies: 10, Views: 230]    By: Unnamed
Hello I desperately need help with this chemistry problem. I know this is a physics site but it was the closest I could get to for chemistry. I would appreciate any help at all. Acetaminophen (C8H...
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PhysicsForums Strontium Compounds  
18:09 28-Aug-06   [Replies: 4, Views: 199]    By: Unnamed
I am wanting to make red colored stars and I would like to know where strontium compounds can be aquired. is there some household items that contain these compounds. I specifically would like to get s...
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PhysicsForums Pressure/Gases  
10:28 28-Aug-06   [Replies: 2, Views: 141]    By: Unnamed
Hi, While using a deoderant/pressurised container why does the liquid/gas come out while we press the knob? And is a high-pressure and low-temp situation possible together?...
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PhysicsForums ion  
08:23 28-Aug-06   [Replies: 4, Views: 156]    By: Unnamed
what is the intention of atom to form ions? how do we know when iron form iron2+ or iron3+ irons? do we need to remember the electrochemical series?...
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PhysicsForums Hybridisation in d-block elements  
04:44 26-Aug-06   [Replies: 3, Views: 160]    By: Unnamed
Hi, can someone please explain how to find the hybridisation when elements of the d-block are involved? For, example.. What is the hybridisation undergone by Fe in Fe(CN)2??...
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PhysicsForums Stronger than Kevlar? (#2)  
00:26 26-Aug-06   [Replies: 2, Views: 236]    By: Unnamed
(This is part two of my "Stronger than Kevlar?" queries :) ) Is Nevlar* stronger than Kevlar? (*A polymer I designed)...
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PhysicsForums Peltier's Effect  
18:19 25-Aug-06   [Replies: 8, Views: 274]    By: Unnamed
It occurs when a current is passed through two dissimilar metals or semiconductors (n-type and p-type) that are connected to each other at two junctions (Peltier junctions). The current drives a trans...
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PhysicsForums It's Poison  
13:27 25-Aug-06   [Replies: 14, Views: 834]    By: Unnamed
I'm writing a story and I need a poisonous chemical to do some characters in. What I'm looking for is something that is very fast acting, very low dose, is a solid or liquid around room temp., would w...
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PhysicsForums Coating Al and Cu simultaneously  
09:41 25-Aug-06   [Replies: 22, Views: 488]    By: Unnamed
Hi, I hope this question is in the right section. I have a heatsink that consists of both aluminium and copper. It's started to corrode, oxidate etc. I've tried different chemicals (such as HCL...
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PhysicsForums proton exchange membrane  
09:28 22-Aug-06   [Replies: 0, Views: 127]    By: Unnamed
I can't find how proton exchange membrane work. I found that it conducts protons, not molecules or atoms, but I can't find why?...
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PhysicsForums Quick polymer nomenclature  
05:58 17-Aug-06   [Replies: 6, Views: 187]    By: Unnamed
How would I name the polymer in the attached image?...
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PhysicsForums The Ultimate Question  
09:29 16-Aug-06   [Replies: 8, Views: 346]    By: Unnamed
it is said in our book that when matter undergoes changes whether physicaly or chemically, the atoms are merely rearranged. no atom is created nor destroyed. (the law of conservation of mass) but ...
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PhysicsForums gaseous water- no need to drink.  
07:34 16-Aug-06   [Replies: 11, Views: 263]    By: Unnamed
I noticed that whenever I am in water, I never feel thirsty, and ofcourse, it makes sense, well I was wondering that if we live in a house where it is filled water vapors, sort of like how humidifier ...
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PhysicsForums Stronger than Kevlar?  
07:00 16-Aug-06   [Replies: 7, Views: 245]    By: Unnamed
(According to Wikipedia, the strongest hydrogen bonds are O—H...N bonds, occuring between a hydroxyl's hydrogen and a nearby nitrogen atom. That's when I thought of Kevlar...) Can Mevlar* be ...
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PhysicsForums working with NaF and KF  
20:38 14-Aug-06   [Replies: 7, Views: 195]    By: Unnamed
Hi! I would like to ask if you have some experience how is to work with NaF and KF at 1000°C but in the lab not under fumecoboard. I know that is toxic but I do not see at the moment how to protect ...
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PhysicsForums Structural stability  
04:12 14-Aug-06   [Replies: 10, Views: 831]    By: Unnamed
Scyllo-inositol should be more stable than myo-inositol, right? (unless I'm missing a certain detail) But in nearly all literature on inositols, it is always myo-inositol that is primarily focused ...
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PhysicsForums changes in glass after heating  
23:45 13-Aug-06   [Replies: 3, Views: 131]    By: Unnamed
After heating some glass bottles to a very high temperature with a bonfire the bottles changed shape as you would expect molten glass to do, but once the bottles returned to ambient temperature they w...
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PhysicsForums Chemical Bonding - Polar bonds  
12:11 12-Aug-06   [Replies: 3, Views: 264]    By: Unnamed
What determines the ionic nature of a bond? I am a bit confused regarding this. Is it the polarising ability of the cation or the greater electronegativity of the anion? Regarding fajan's rules, smal...
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PhysicsForums Answer This If You Can  
05:38 11-Aug-06   [Replies: 8, Views: 278]    By: Unnamed
it is said in our book that when matter undergoes changes whether physicaly or chemically, the atoms are merely rearranged. no atom is created nor destroyed. (the law of conservation of mass) but ...
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PhysicsForums Paramagnetism/Diamagnetism Predictions  
23:21 8-Aug-06   [Replies: 1, Views: 72]    By: Unnamed
Is it impossible to use the Localized Electron Model to predict whether a given molecule is para/diamagnetic? Since the LE model only allows for the prediction of where specific electron pairs are...
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PhysicsForums Rusting in the fermentation room. Explanations?  
03:43 8-Aug-06   [Replies: 9, Views: 207]    By: Unnamed
Hello all, Recently I have come across a problem that I cannot seem to understand. A fermentation room was built out of an insulated wall system provided by a company called BONDOR, started to rust...
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PhysicsForums Percentage of NH3???  
10:24 6-Aug-06   [Replies: 0, Views: 2]    By: Unnamed
Recently I've done an experiment and we are required to determine the percentage NH3 in the complex by mass. I had no problem doing the experiment but stuck in the calculation part Really hope...
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