Chemistry

Is fluorine reactive enough to react with gold? Regarding this reaction, does plastic have a higher tendency to react than gold?

Does anyone have knowledge of the chemical composition of moon regolith?

According to the Pauling Scale, compounds with electronegativity difference of 1.7 or above is considered as ionic compound; compounds with electronegativity difference between 1.7 and 0.4 is considered as polar covalent compounds, those below 0.4 or 0 is non-polar covalent compounds. When I check the electronegativity difference between hydrogen and lithium, it is 1.1 which is between 1.7 and 0.4, according to the Pauling Scale, LiH should be polar covalent compound, however, it is told that LiH is in giant ionic structure and the bonding is 'appreciably ionic'(while 1.1 is not just a bit smaller than 1.7 in the scale) in the text book. The same situation is found in cas…

My chemistry teacher is so retarded! She tried explaining this problem to me, but I think her logic was flawed. Could anybody please help me solve it? I don't mean to sound like all those other people who try to get others to do their homework. I actually did attempt this problem, but I think more information is needed. Here it is: Determine the calorimeter constant for a particular bomb calorimeter by mixing 50.0mL of water at 25.0 degrees C with 50.0mL of water at 60.0 degrees C. The final temperature attained is 40 degrees C. Any help will be greatly appreciated!

So we did this lab in class in which we inserted a temperature probe into various samples liquids, removed the probes, and then measured the temperature drop over time of the evaporating liquids. Two of the liquids we had to test and compare were n-heptane and n-hexane. According to my predictions, the heptane, due to its longer chain structure, would have a greater instantaneous dipole, which would mean greater intermolecular attraction and higher boiling point. This would have suggested that there would have been a greater temperature drop in the heptane than the hexane because more energy would be required to separate the heptane molecules. The experiment proved me…

I've hard of that liquid stuff that "burns" (some say it's not actually buring, but whatever) at about 30 C. Where could i buy some of that, souds awsome!

Alright, for school this year I need to do an experiment having to do with either Nuclear Energy or just energy, and I have looked EVERYWHERE for 5 days and have NO ideas, maybe someone can help me?

Hi, what are the chemical properties of the most popular brands of car tires? (Specifically I'm interested in how they are constructed, what they are made of, what the chemical properties of the stuff they are made of are and so on....). Also what happens if you heat these tires up? Do they melt at a specific temperature? Is there any similar kinds of materials that melt at a higher temperature - and if so what are they? GJ

The reaction between Na and O2 as the following: 4Na + O2 --> 2Na2O Once I check the data base, I found out that the first ionization energy of Na is +500kJ/mol; the first electron affinity of O is -142kJ/mol; the second electron affinity is +850kJ/mol, so if I add up these numbers, the result should be positive, so is that means that the reaction is an endothermic reaction?

I have two questions on chemistry. We recently did a lab on MOLE RATIO AND CHEMICAL REACTION. What we did was observed the precipitate that was created from combining [math]Pb(NO_3)_2[/math] and [math]Na_2 CO_3[/math]. The balanced equation for this chemical reaction was: [math]Pb(NO_3)_2 + Na_2 CO_3 \rightarrow PbCO_3 + 2NaNO_3[/math] Okay.. So, using limiting reactant and other things, I was able to predict the number of moles of [math]PbCO_3[/math] that was resulted. But I can't find the answer to two questions that followed it (I have approaches but I don't know if this is right..). We used [math]0.50 M[/math] for molarity (the concentration of solution). …

Hii, I have a question about boiling water. Here is the problem: (This is in a restaurant) There is a boiled water (which is one order(of soup to be exact>_<)) Then, we find out there is supposed to be 2 orders instead of 1 order. So, one person says, we should take that already boiled water out, then boil another one. The other person says, we should just pour another into that already boiled water so they mixed together. So my question is, which one will boil up faster? I can't test it out myself since I dont have the materials. Could anyone please explain to me which one will boil up faster and why? If possible, could you please provide me a site or anyth…

Hi folks! Reading through this forum I was amazed to find so many nice and knowledgeable people in one spot. So what better place than this to ask my question? Here goes: I'm looking for a substance that's liquid between 120K-170K, that's capable of dissolving water(ice) and other simple (organic) molecules, and that's not too rare. I already looked into the well documented mixture of ammonia and water, but it doesn't really seem to work for my temperature range. H2S mixed with water looked promising, until I hit a reference that it doesn't really mix with water but forms a clathrate instead (is that correct?). Next I tried to find information about substance like …

anyone know where to find one? i'm trying to find the acidity of caro's acid (H2SO5) in comparison with sulfuric (H2SO4)

My highschool has a science fair in the end of May this year, leaving me with about five months. See, we already have an idea for the project, me and my partner, but I think we could do better. Any suggestions? I can get most chemicals needed.

Hi All! I found this link and it seems to have some interesting information so I thought I'd share it http://www.bbc.co.uk/dna/h2g2/alabaster/C56 Lots of information onplenty of things Enjoy! Cheers, Ryan Jones

When you spill some acid on paper, why does it turn yellow?

Is it true that when 1-butanol in the "presence" with sulfuric acid, it will produces water and 1-butene in an elimination reaction?

Do gases of different molecular weights separate like liquids would? Mainly I'm thinking of gases like Cl2 and H2. Would the H2 gas form a "layer" on top that I could release from a container? I ask because I found when electrolyzing salt water it can produce Cl2 and H2, and also that when these two are exposed to sunlight and each other they can "explode to form HCl." I don't want an unsupervised explosion...

Hello! I have some samples of depleted uranium for my element collection. When the samples arrived, I became a bit concerned about how they were stored. Supposedly, under argon, but they have a relatively heavy layer of oxidation. I moved one of the two samples to a small glass vial under mineral oil (heavy, USP) to hopefully stop any further oxidation. The samples are each over 2 grams. Uranium oxide is much more toxic than uranium metal, so I'm a bit wary about trying to remove it from the samples. That said, any advice on doing this? Under mineral oil (of course!) with a brass or aluminum brush? I don't want to scratch the uranium metal underneath, so I should …

Hey everyone I am new and this is my first post. Pbviously I am a newbie to this stuff. However, I have began talking my first chemistry class and I am so intreged. So anyways I was wondering if anyone can refer me to a website that sells chemicals online through Paypal. All i have found so far is http://www.unitednuclear.com

Does anyone know exactly how Photochromic and electrochromic glass works, ive been doing some research and could not find an explicit explanation. Any help would be greatly appreciated.

ryan jones, please explain yourself:-p

Would there be any difference as to the etching of lead if I used DCl rather than HCl?

Just seen this video here: http://www.ebaumsworld.com/marshmallow.html or here http://www.funny-videos.co.uk/videocoolexperiment.html or here http://video.google.com/videoplay?docid=1775983120224943095 (All the same video!) Anyway, I was wondering what the reactants (and I spose products) are in this experiment. Can anyone help? (I called this "Marshmallow video?" because the top site's info on this video is "How marshmallows are made", question mark because I don't know how accurate that is)

1) During the cracking reaction of heavy oil, if we place some medical paraffin in the bottom of the boiling tube and place some powdered broken porous pot in the middle of the boiling tube, what'll happen if we heat the bottom of the boiling tuble (the place where medical paraffin is placed) but not the middle (where powdered porous pot placed)? 2) How to test the flammability of a substance? And what observation can be seen? 3) What's the oxidation number of glucose,C6H12O6? zero?