Chemistry

Why would ice melt more slowly when adding salt or sugar in it? Albert

does anyone know the exact structure of glass? i know it is silicon dioxide...but i've heard it arranged tetrahedrally so that there are a bunch of Si-O-Si-O-Si bonds happening with O-Si-O-Si-O going up vertically from each of the Si atoms in the above horizontal pattern. eventually these patterns end. if the Si were to doubly bond the oxygen at the end, the Si would be making 5 bonds... and i know they dont ALL end in Si-O-H because fluorine doesn't attack glass THAT quickly so...what does it look like exactly at the ends?

Hello all, I was hoping someone could help me with a question, Is there a powder or oil that you can only see when wearing glasses, somthing that will show if you put it on clothes or in there hair, you can't see it with the naked eye, like when playing paintball at night, you can see were that person is in the dark, Somthing like a Luminous Meterial, I hope i'm explaing it the right way, I have been doing a search and have come up with nothing so far, Thanks All

My chem book tells me that Oxidation = loosing electrons Reduction = gaining electrons I am really confused why those meanings are called like such... what does loosing electrons have to do with "oxygen"? and What does gainning electrons have to do with "reducing something"?? gaining is obvious not reducing... Any help? Albert

Hey guys, YT's thread in regards to cadmium reminded me of something I wanted to ask. In my element collection, I have a bunch of cadmium rods. However, they are old rods and have a lot of oxidation on their surface, and some show a red color from when I chiseled them into smaller pieces on a brick. The ends of a few of the rods have maintained a beautiful shine to them, and I'd like to polish a few of the rods in there to bring out the beauty of the cadmium. Sadly, I'm not sure what the best way to do this would be. With the toxicity of cadmium, I am not going to bring my dremel to it in order to polish it. I was thinking about taking some water and making it very …

I was jus wondering........I have read many chemistry books throughout my life and taken numerous chemistry classes...but i have yet to have heard another name for the zigzag line which separates metals from nonmetals...doesnt "zigzag line" sound a little "unscientific"? im sure there is another name for it and if anybody knows please reply on this thread....thnx

The tempereture outside where I'm at is [math]6.7 \ensuremath{^\circ}C[/math] ([math]44 \ensuremath{^\circ} F[/math], [math]279.8 \ensuremath{^\circ} K[/math]). So when I blow outside, the [math]CO_2[/math] from my lungs becomes visible. Why does this hapen?

I was wondering if anybody had any good sites or really good sites that could help me out with atomic structures. Thanks

hi there, i was hopeful someone could clear this up for me. if i have a solution of H2SO4(aq) and i want to calculate its pH would i count the deprotonations of both H+ ions as equal? eg. if the concentration of my solution is 0.3mol dm-3 what is my pH? is it? a) -lg2[0.3]=0.22 or b) -lg[0.3]=0.52 the thing is the 2 proton is obscured by the first so to say. in a way 1:10 concentration. so... would it be... c) -lg[0.33]=0.48? i like the last one but i've seen both the first two before tell us what you think thanks

at 1000K the equilibrium constant for H20(g)+C(s)<=>H2(g)+CO(g) is 3.72atm. If total pressure is 25atm what would the partial pressures be? Could someone tell me if i've got the right answer in: 69% reacted. therefore Partial pressures (Pg): Pg(H20)=3.875 Pg(H2)=8.625 Pg(CO)=8.625 i used x=reacted H20 1-x ; C 1 ; H2 x; CO x; total=3 Xg= 1-x/2; unity; x/2; x/2; for the compounds respectively. i'm not sure how to treat carbon as it is solid. do i count it as 1 when calculating the equilibrium total moles? thanks in advance. my Alevel is in a week n i'm not sure of this one

i've heard that one can produce sodium hypochlorite by pumping chlorine gas into a saturated solution of sodium hydroxide. i've also heard that if the solution were boiling, one could produce sodium chlorate, some of which precipitates immediately due to solubility rules, but the rest of which forms interesting looking crystals upon continuous boiling followed by cooling. of course, this sounds like much fun to produce. i was wondering if a better yield would be produced if i were to use potassium hydroxide i was also wondering how much hypochlorite would be formed in the process. and finally, i was wondeirng what sort of apparatus to use. i was thinking ab…

I originally found this experiment on the internet...However after i did it i modified the % so it reacts better. NEGATIVE-X is a substance that when a little drop of water comes in contact with this it reacts and flares up. Its compsed of Ammonium Nitrate 27 % Ammonium Chloride 3 % Zinc Dust 70 % (By weight) Crush all of these into a powder and mix them together. Then add a small drop of water and stand back. Try not to store it for a long time, but if u do then cover it with a beaker.. BEWARE THIS HAS SENT ME TO THE ER Also im not resposible for anything that happens to you

recently i've been trying to figure out a good way to produce manganates. one way is the tried and true method of using fused potassium hydroxide with manganese dioxide and an oxidizing agent, such as potassium chlorate. this of course works to oxidize the manganese. i was thinking though, what about trying this in reverse? by reverse i mean reducing a permanganate, which is easier said than done when we're talking about reducing it to +6, as permanganates tend to reduce to manganese dioxide. after awhile, i figured that if one were to add a fused alkali cation, the alkali would attack the permgananate at one of the doubly bonded oxygen atoms, causing the…

I'm having a hard time finding places to buy chemicals, anyone know a good place or 2? Also I'm after a nickel mesh, this is also not esy to find, my google skills arnt what they used to be, lol.

my book gives an example of how to find the concentration of OH- for transforming 99% benzoic acid to benzoate anion. it is difficult to understand how they get the answer, since there are no specified concentrations for the benzoic acid and benzoate anion, besides the way they write it is also difficult to understand. this is how they write: the ability to separate a strong from weak acids depends on the acidity constants of the acids and the basicity constants of the bases as folllows. in the first equation, consider the ionization of benzoic acid, which has an equilibrium constant Ka of 6.8x10-5. the conversion of benzoic acid to the benzoate anion in the fourth eq…

WELL! BUDDIES, I LOVE CHEMISTRY . BUT...THINGS R CONFUSIN.LOOK! I AM BENZEX OR U CAN CALL BENZENE.MY TEACHER TOLD ME ABOUT THE MOLECULE AND I READ A LOT ABOUT THE MOLECULE FROM BOOKS.HISTORY SAYS BENZENE IS FOUND BY A SCIENTIST KEKULE'.BUT SOME BOOKS SAY ITS REALLY FOUND BY AN AUSTRIAN TEACHER AND KEKULE' FOUND HIS WRITINGS AND DREAMED ABOUT THE MOLECULE.SO THE MOLECULE IS REALLY FOUND BY THIS TEACHER THEN.THE QUESTION IS ,Y KEKULE'S NAME IN HISTORY BUT NOT THE TRUE FOUNDER ,THE TEACHER?CONFUSED! REALLY UNFAIR .(I AM NOT AGAINST KEKULE' HEHEHE). :confused !

Hello everyone! Are there any GRE Chemistry examinees here in this site? Hope to receive responses here. Regards, Tashkent

Hey my name is Nathaniel. As I mentioned in the general discussion I am a Canadian and new to chemistry. First year student taking a 3 year technologist diploma in a 2 year program ... without a doubt the hardest thing I've ever attempted. I am struggling with organic chemistry. The nomenclature but especially reactions. Does anyone have any web sites that summarize organic reactions ... for a first year student? Thanks guys/gals.

I got a question in which I am having considerable difficulty with: The following reaction takes place in a 1.00L vessel at 500C. 2HI(g) <---> H2(g) + I2(g) Equilibrium concentrations were found to be 1.76 moles/L HI, 0.20 moles/L of H2, and 0.20 moles/L of I2. If an additional 0.5 moles of hydrogen iodide gas is introduced, what are the concentrations of all gases once equilibrium has again been reached? I have tried it several times, but my Chemistry teacher said that my answers were wrong. It's due for Monday (Nov.19), so if anyone can answer it before then it would be greatly appreciated .

I dont need anything fancy, just HCL, H2SO4, and the like... Most inter net site wont send it to you unless you are a school or chem lab. My college professor used to give me small amount but now I dont go to that school... I like to call it garage chem

i have to make a report on an element. i got the most boring element there is, terbium. i have to make an add like im selling the element and i have no idea what to put because i cant find one intereasting fact on this element. please help

Why do molecules absorb in the visable region of the light spectrum?? Do their structures have something to do with it? I was told it had to do with conjugation, but I am still confused. Please help!

I had a few questions in my exam that I found a bit troublesome: 1. there is this substance called germinol with the structure: R-C=C-CH2OH (let me know if it isnt clear) l l CH3 H and we were asked to draw a cis-trans isomer of this structure. Now, as far as i know, it isnt possible since cis-trans isomers occur only when the double bonded carbon atom have at least one similar pair of a group/substance, attached to each one. Am I correct here or I screwed up leaving this question blank?? 2. for the above substance, what will be the structure of the organic…

As stated in the title, my main focus is on the comparison of bonding in solution and compound, and what is the difference of solution and compound....or is a solution a compound?? Just take one example, when salt is dissolved in water, why the solid phase is broken down by water? What does this look like??? and how this structure make electrons of each of the element in salt free to conduct electricity??? thx for any respond Albert

Hello everyone! I was wondering if anybody could help explain to me how to deduce whether the following were either diamagnetic or paramagnetic? (i)O2 (ii)N2 (iii)B2 (iv)S2 and finally... (vi)NO What im really hoping for is a method that i could do myself in order to deduce compounds such as these... Any help would be gratefully appreciated thanks.