Chemistry

I always though Gallium was perfectly safe. However just as I look it up on ebay to buy some I find this. http://www.acialloys.com/msds/ga.html Anything there that could be a problem with handling it? It's a metal, can it really catch fire? This guy is going on a lot about his metal being so unique, however is this not a similar behavior to gallium? http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=160177584795&ssPageName=ADME:B:SS:GB:1123

I am so happy. I have added two radioactive elements to my collection; Americium and Neptunium. I picked up a couple of smoke detectors and see that the ionization chamber of one has 0.1 mCi of Americium in it, and the other one has the same amount of Neptunium in it. I guess I got lucky with the two brands I picked up in order to get the two separate elements. I'm not going to open the chamber, but I just have the two small cylinders with the labels attached to the casings inside my element collection. Kind of neat knowing that I got two transuranium elements from freaking Wal-Mart.

Hi all, I have read alot about acid-base titration in books and whenever I come across this topic I have observed that in titration reaction the volume of acid is taken to be less than that of an alkali.I have 2 questions. 1.Is my observation correct or not? 2. If so what is the reason for the said observation? Any help will be most appreciated by me as always!!!!

Can anyone tell me how I can determine the allowed quantum numbers, ml and ms, and the max occupancy of sub shells for lets say 5g....... How can I determine the ground-state term symbols for lets say p^4 or d^5.... And finally how do i figure out the term symbols for ground-state configurations of the atoms H thru F? Any direction would be much appreciated.... Thanks

There's a lot of stuff to talk about II group elements. We all know that their characteristics change in a periodical way, but there are some slight deviations which don't fit with what is said in the book. 1. According to official data it is said that with the increase of the atomic number (the addition of electrons and protons) the melting point of the elements in II group decreases. So higher atomic number, smaller melting point. But the deviation is: ELEMENT MELTING POINT Be 1285 C Mg 650 C Ca 845 C Sr 771 C Ba 72…

This year, we've been learning about elements one by one at school, and the one I really find interesting is kalium (K). Its characteristics just fascinate me, and I really feel that I really must get some (as I've been thinking for its use). So could anyone please tell me how can I get kalium in a nice, economic, easy way?

ok. this is really weird but here it goes. I want to prove my chem teacher wrong by saying the exact temperature of 0 kelvin. He says its -273.15 C but i cant say for sure. google, my ti-84 calc, converter sites say -272.15 C but others like wikipedia say -273.15. What is is :confused: Is it really that hard to get it right (hypthotical question)

Ever wonder how a Hydrogen Car works? If so, find it here. Also, post any ideas on how to improve the modern hydrogen car, or how you think it should work.

First off, Is the act of bonding always a reaction? And does the act of reaction always lead to bonding? My intuition tells me that a reaction MUST either create a compound or break a compound apart into elements, and that there is no chemical reaction without this creation or destruction of bonds. How does that sound? Secondly, I have some inquires about 'chemical equation/notation' Does the presentation of the equation differ depending on the type of chemical bonding taking place(ionic, covalent, etc)? Can the same two elements bond in two different ways? Or do specific types of bonding apply to specific combinations of elements, and …

Hello. I used to mix luminol with bleach to get chemiluminescence for a few seconds. The commercially sold glowsticks are able to glow for hours. Does anyone know what is available to get this more "permanent" kind of luminescence? Thanks in anticipation

Hi, I have some questions please answer them for me: which is true about catalyst; A. They lower the activation energy for a reaction OR B. They provide a different pathway, one with lower activation energy. Now some books say the former but my teacher believes the latter is actually true. What is your say on it. The below is a worked example from a book which I think has mistakenly printed it. what you say: " What is the pH of 2 mol dm-3 NaOH? NaOh is a strong base, so it exists as ions. So [OH] = [NaOH] = 2 mol dm-3 so -log[OH] = -log2 so pOH = - 0.3 so pH = 14 - (-0.3) = 14.3 " Now…

Carbonate buffers are important in regulating th pH of blood at 7.40. what is the concentration ratio of CO2(usually written H2CO3) to HCO3- in blood at pH 7.40? H2CO--HCO3+H+ Ka=4.3x10-7

how do i do the next problem get the pH of a mixture containing .100 M (CH3CH2COOH) nad .100 M CH3CH2COONa

Hi everyone, I was wondering if you could help me. I am looking at ionic equations, and I'm a little confused. I'm confused about knowing which ions why can omit from the equation. For example: (step 1)HCl(aq)+ NAOH(aq)→NaCl(aq)+H20(l) ions present: (step 2)H+(aq) Cl-(aq) Na+(aq) OH-(aq) → H20(l) Na+(aq) Cl-(aq) So Cl-(aq) & Na+(aq) appear on both sides of the equation and so are spectator ions & can therefore be left out of the equation making the ionic equation: (step 3)H+(aq) OH-(aq) → H20(l) However, what are tghe principles that can be applied to different ionic equations to understand what ions are spectator ions? When…

Calculating the viscosity of a blended liquid consisting of two or more liquids having different viscosities is a three step procedure. The first step involves calculation of the Viscosity Blending Index (VBI) of each component of the blend using the following equation (known as a Refutas equation): (1) VBI = 14.534 × ln[ln(v + 0.8)] + 10.975 where v is the viscosity in centistokes and ln is the natural logarithm (Loge). The second step involves using this blending equation: (2) VBIBlend = [wA × VBIA] + [wB × VBIB] + ... + [wX × VBIX] where w is the weight fraction (i.e., % ÷ 100) of each component of the blend. In using the above blending equation, it…

the deionised water you can buy to top up car batteries is NOT! it contains Chlorine at least I know as I nearly lost 3 days work purifying Silver Nitrate

What radioactive element produce heat in their natural decomposition, or combination of radioactive element produce heat?

Hi everyone! I know that there is invisible ink that you can see with a black light, but does anyone know if there is invisible ink that you can only see with special glasses and you don't need a blacklight for? Would appreciate any help on this!

I have a slight problem that I think one or more of you probably know the answer to. I an a skeet shooter and occasionally I need to clean the trigger mechanism of one of my shotguns. I usually do this by spraying WD40 in to the assembly and then blast out the excess with compressed air. Now compressed air usually has a certain amount of water in it, so I am worried about introducing moisture into the mechanism that could cause rusting to occure. So, I bought a can of air duster to take the place of the compressed air. Now the ingredients are listed as simply "Difluoroethane." Wikipedia says that Difluoroethane is a chemical compond that is, in part, flo…

Hi, How do you find the mass number of element? Internet search told me that if I round the atomic weight, I get the mass number. I never heard of anything like this before so can anyone confirm this? Thanks.

Hi, I am preparing for interview at oxford for chemistry undergraduate chemistry course (MCHEM). I am looking for some tricky questions that might help me to enhance my understanding regarding different chemistry questions. If any1 of you has links to any website which have questions which can particularly help me in my chemistry interview I would be grateful if u provide me with that. And i have a question i need help in. it came as oxford university interview question: "calculate the average interatomic spacings particles in the room". any help:confused:

So I'm studying for my upcoming ACT and I could really use some help on the science portion, especially the chemistry. On my pACT studying test, one of the questions asks: "According to the information provided in the table, the concentration of which of the following ions and dissolved gases is constant for sediment depths of 10 cm or more?" A. Sulfide (S^-) B. Carbon dioxide (CO2) C. Ferric iron (Fe(power of 3+)) D. Oxygen (O2) (^ = squared) my problem with this question is that I have no idea what sediment depth means, let alone what each of the answers sediment depths are. Can somebody please elaborate for me?

Hi, I was asked this question by my friend and when I gave away my answer he was unconvinced. So I ask you whether I was right or not. He asked me what was the actual meaning of 'End-Point' when you do titration. I said that it is meant to be the end of reaction indicator. He argued that if that was the case then when we do neutralisation using a strong alkali and a weak acid then why the graph of that reaction shows that the end-point(in terms of ph) might have reached at ph9. I was so confused about it that i told him that end-point does not necessarily means to reach a certain ph which might indicate us that the reaction has completed. I told him if he'd d…

Hi, I was taught the structure of benzene the other day by my teacher and he explained it with the help of hybridization. Firstly how well u define hybridization. I know it a little but don't think it is required at A'levels. Nonetheless I am curious to find out everything about it. Can any1 help

Does Zinc react with water??