Chemistry

for example, when you take a whiff of pepper you sometimes sneeze? any idea what chemical is responsible for this?

The melting point of the Graphite is higher than the diamond !! Can anyone explain why is this happen ??

Hi, Is there any chemical that will errode away brick or cement?

Hi, can some one pleas tell me how to do these questions? Thanks. How many atoms of C are in a mixture containing 0.237 mol of CO2 and 2.38 mol of CaC2? calclate the following the mass (g) of one atom of xenon the mass (g) of one mole of xenon atoms the number of atomic mass units in one gram

I was wondering if anyone knows how good the chemistry is at Harvard? Also what school has the best Chemistry?

Did anyone see Cold Case “Superstar” on Mar/26/2006 on CBS? Anyone feel like joining me for a laugh about how they seem to think you can kill someone by ‘lacing’ their towel with sodium nitrate? Don’t these people have a science advisor? (in case you didn’t see it, it was about a case where a tennis player gets killed by a towel laced with ‘poison’, sodium nitrate.) Oh! But the killer was a chemistry major, she must have known sodium nitrate was ‘deadly’! Sorry this probably isn’t worthy of a post, but I just had to vent about this ignorance.

I developed a program for balancing chemical equations. A beta-version of this program already was available, but now I present a new version, which allows the use of preserved groups (useful for organic chemistry) and the use of isotopes. The program can be used for balancing any chemical equation, e.g. it nicely balances equations like the following: [ce]..K2Cr2O7 + ..KCl + ..H2SO4 -> ..KHSO4 + ..Cr2O2Cl + ..H2O[/ce] The program determines the coefficients, needed to make it correct: [ce]K2Cr2O7 + 4KCl + 6H2SO4 -> 6KHSO4 + 2Cr2O2Cl + 3H2O[/ce] The program can also do computations from moles to grams and vice versa and it computes weight ratios,…

Hi. ¿Any modern progress in the subject, can it be done? Some rubber parts change their properties with time or exposure to something, turning soft and gummy... Is it because they were poorly vulcanized, or they are not rubber, or had a different manufacturing process ? Miguel

I was wondering if there is some kind of equation out there to solve a problem like this. How many milliliters of a 25% solution of potassium chloride must be added to 8 milliliters of pure potassium chloride to obtain a 35% solution. thanks

Hello everyone I am new in here I have some problems in making the solid fueled small rockets I cant find the proper chemical like KNO3......Can i use the burning material of a matchstick??? And whatelse can i do to make it????

what can i do with these. I have about 8 oz of each on the way. im planning on using a little in rockets but i dont know what to do w/ the rest. or how to store them. if it helps im getting them from united nuclear.

hey guys(and girls) were do u get bunsen burners CHEAPLY I need one but cant find one. a little help pleeeeeeeeezzzz

Hello. I'm looking for a instrumental analysis textbook on spectroscopy and electrochemistry. If anyone has any good recommendations please post them up. I have a number from Skoog and would like a few others. Thank you for your efforts.

Im having a school science fair and would like some ideas, hopefully in chemistry or physics. REMEMBER Im in 6th grade. I don't mind anything up to eighth grade.

when you mix Manganese (s) with Hydrogen (L) the manganese remains at the bottom of the test tube, why is that? Is it because the hydrogen solution is fully saturated?

i want things like oxygen, hydrogen, carbon dioxide, and any other gas that wont kill me. so what can i make and how?

Compare the results in lads 4 and 5 then provide an explanation for any differences in your observations lab 4-Cu(NO3)2+Ni= Ni(NO3)2+Cu lab 5-Ni(NO3)2+Cu = Ni(NO3)2+Cu why would there be differences?

Nickel Nitrate-Ni(NO3)2 Copper Nitrate- Cu(NO3) Ni(NO3)2+Cu= Cu(NO3)+Ni= help!

How can you predict weather or not a precipitate will form in a chemical reaction? can some one pleas help me with this i have no idea what the answer is

I am starting this thread as a place where people can leave their thoughts on the terrible explosion which occurred on the 24 March at the National College of Chemistry, Mulhouse, France. My thoughts go out the friends and family of the dead Professor and the injured students and staff. I also would like to pay my respects to the dead professor for his work in researching high risk procedures for the advancement of science. I think we all need to the remember the triumphs of science despite the risk over the years. It people like the professor that died that has enabled the human race as a whole to learn and advance. My salute to scientists in all areas, may your good …

I would like to know which type of plastic is best for storing water. PETE, HDPE, V, LDPE, PP, or PS? Mainly worried about the plastic chemicals leeching into the water over a long time of it. Yeah, yeah, glass is best, but it can break. And other safety or things I should be concerned about.

There has got to be something cool to do with it... cool not k3wl! so any ideas?

Okay, so this equation appeared on my last chemistry test. I wrote the following: NaF(aq) + HCl(aq) --> HF + NaCl(aq) Apparently my answer was correct except that I didn't know what phase the HF would be. I asked my chem teacher and she said she didn't know (sad huh?). So I have to resort to a science forum for the answer. What would the phase of the HF be? I thought it would be a gas.

Im thinking of just using my 120v house electricity... is it posible? or way to dangerous, because i would assume 120v of AC would produce hydrogen and oxygen faster than 12v 300ma of DC. also one time i mixed a lot... and i mean LOTS of salt in with the water,. and it made a smell kind of like chlorine gas, accept less smelly and not green, what may have happend?

I have some... whell i plan to make some and i dont feel like seperating the gases, so if i put the mix in a balloon would it float? BTW im getting it from electrolosys of water, so its 2:1 ratio of oxygen to hydrogen right?