Chemistry

I took AP chem last year and got a 3 on the exam. I want to go into chemistry as my major but I can already hardly remember anything about the course. I know it seems sad but I think I've forgotten so much. I don't want to be lost next year when I get to college, are there any fairly thorough AP chem review books that I could get my hands on and essentially reteach myself the course? I don't want exam review necessarily just review on the course in general so I can prepare myself. I wish I still had my old textbook, but they are so expensive. Thanks.

While we've had a lab picture thread and some threads regarding element collecting I thought it might be cool to have a thread dedicated to just pictures of neat looking element samples and chemicals you have lying around your house/lab. Crystals, powders, gases, liquids... everything goes. Emphasis on samples you think look especially cool. I have a decent element collection but since I've gotten a new camera I haven't photographed all samples. I'll take more pictures later but here's what I've photographed so far:

Okay, here is what happened in a nutshell. Please do not respond unless you are seriously wanting to help. I have “beat myself” up enough over this. I accidentally ingested a solution from a dirty test tube that I believed to be only distilled water. I know for a fact that it came out of my distilled water container that had been sitting there for close to a year. When I grabbed the test tube and put the water into it, I did not notice any solids/powder/etc but there may have been a small amount of solid in the bottom which was unnoticed. No other student came into contact with the test tube. It was not “sabotaged”. I did not intend on drinking it. I made a grave …

Hi! basically, I'm doing some practice questions, and came across one, which i'm not quite sure how to calculate.. I had a go at it and this is my answer.. can anybody tell me if the method I used is correct, or if I'm going about this the wrong way!! The question was.. a lysis solution contained 50 mM Tris, 100mM NaCL and 0.01% (w/v) SDS. How would you prepare 100 ml of this solution? So what I did was : Start Final Volume x Concentration= Volume x concentration So Taking a start concentration of 1 M, then TRIS = T x 1M = 100 ml x 50 x 10-³ M NaCl = N x 1M = 100 ml x 100 x 10-³ M SDS= 0.01% is the same as 0.01 g/100m…

Hi, if you have a brominated hydrocarbon - how easy/what can you do to de-brominate this (back to the hydrocarbon)? Can this be done via some sort of ion exchange column? Cheers, P.

1. After the vapour has condensed to a liquid why is it important to obtain the weight of the liquid "without delay" in number 8? 2. What assumptions are made about the vapour of the substance in this labratory? Lab Info 1. Weigh a clean , dry 100ml volumetric flask together with a square of aluminum foil to 4 decimal places. Record this mass in the data table. 2. Pour 3 to 5 ml of an unknown liquid into the volumetric flask. Record the unknown letter in the data table. 3. Cover the flask with the foil and make a tight seal. Make a small hole in the top of the foil using a pin. 4.Place a 600ml beaker on a hot plate and lower the volumetric flask into …

I'm teaching this topic soon and i'm trying to get my knowledge up to scratch. I know that the books usually define a diamagnetic substance as one in which all the electrons are paired. and a paramagnetic substance as one with unpaired electrons. For demonstration purposes I have a small torsion balance set up so I can show the diamagnetism of bismuth, which works beautifully. However, I realised yesterday, that according to everything the textbook says, bismuth ought to be paramagnetic, as it has the electron configuration: [math]Bi: [Xe]6s^24f^{14}5d^{10}6p^3[/math] The three p-electrons ought to be unpaired and hence the element should be paramagnetic…

What happens when you put mercury and aluminum together? I read that ist bad but as an experiment, I put a small blob of mercury on some aluminum foil and nothing happened.

Diamonds are a lattice of carbon atoms, each bonded to four other carbons. This leads me to two questions: First, what happens at the surface of a diamond? How would the carbon atoms at the surface of a diamond bond? Second, when a diamond breaks, carbon-carbon bonds have to be broken (assuming it doesn't break along an internal fault). This seems like it would be virtually impossible to do, and it also raises the question of what happens once these bonds are broken.

If it's not too technical could someone explain why the closer an electron is to the nucleus of an atom, the less energy it has and the farther away from the nucleus, the more energy it has. I've always understood that the closer an electron is to the nucleus the more energy is required to remove it.

Using average bond energy values estimate ΔE for the following gas phase reaction. CH2=CH2 + Br2 → BrCH2CH2Br

For the equation change in enthalpy = bonds broken - bonds made. What if the compound makes a double bond. Meaning in the reactants there is a C--O bond, in the product it becomes C=O, do i add for bonds made the value for a single C-O bond (since 1 C--O bond already exists) or the value for a C=O (the final product)?

Like maybe not complex ones, but ones that are just plain cool!

Arrange the indicated bonds in the above molecule b1 b2 b3 b4 from left to right by increasing energies. That is, start with the smallest on the left and end with the largest on the right. Use the average values for bond energy that are given in your text.

can any one let me know the chemical properties of cow and soy milk.

Where the alchemists successful in their experiment??? Atleast did they find anything new???

Hi all I am going through covalent molecular substances right now and there is a point that I don't quite get. It says 'covalent molecular substances can be elements (e.g. iodine, phosphorus and sulfur) as well as compounds.' Take iodine I[math]_{2}[/math] for example, it is all very well that a covalent bond exists between two atoms of iodine. However, the definition for element goes 'an element is a pure substance which cannot be decomposed into simpler substances'. My question is: Is it not true that iodine can be decomposed into 2 iodine atoms, that is, into simpler substances? Thank you

Please some body help me to guide to use right formula to calculate chloride content in a material. Silver nitrate VS(0.1N) was added in sample solution in both blank and sample. Excess silver nitrate was titrated with 0.1 N amonium thiosulfate VS using ferric amonium sulfate as indicator. Equivalent factor is 3.545mg of chloride for eaach ml of .1 N silver nitrate. Will this be the formula (blank-sample)(AgNo3 factor)(NH4SON factor)(3.545)/weight of sample I shall be very thankfull is some one can help amy

It's that time of year again, folks. Between 6:02am and 6:02pm in the 10th month on the 23rd day, we celebrate the mole. Question is, how? I'm thinking of perhaps blowing up a mole of something in a spectacular fashion...

Hi all, I was wondering what exotic metal you guys would recommend to turn into an engagement ring? When i pop the question, i was thinking of doing something different and getting a jeweler to melt a lump of my chosen metal into a ring and inset some stones. Originaly, i was thinking of something like palladium or rhodium or something similar, but ideally it would be a rare earth metal. Can these be polished to be nice and shiny? Would be great to have a nice shiny ring made from Ytterbium.. Will they tarnish easily or react to the moisture in the skin? My girlfriend knows im into chemistry and physics and is forever calling me a geek, but i think she would appre…

Greetings Everyone, I have been lurking around this site for a while and decided to say hello! After reading a lot of the posts around here and checking out Theodore Gray’s website I have rekindled my interest in Chemistry and recently started my own element collection. So far I have nice samples of Cr, Ni, U, Th, P, Na, Li, Zr, Ti, Nb, Co, Ni, Ag, Au, Zn, Hg, C, Al, O, Cl, I, Ar, and Xe. A lot of my samples have come from eBay, the big dealers like Dave Hamric, and some private individuals (many from Theo’s website). It’s been a lot of fun, a great educational experience, and I have met a lot of great folks. I am surprised at how much interest my hobby has had…

i was working with the electrolosis of water, and i was using copper wires, i ended up with a black, greyish solid dissolved in salt water (i added salt when i started the elactrolysis) im trying to figure out what it is, what can i do to test it for copper? (i cant use a flame, and i dont have access to many chemicals, im a HS student) if you could, it would be nice if you could e-mail it to me at wrestler-tdz@hotmail.com

Im no chemistry genius (im more into bio), but... I just spent the last 20 minutes drooling at the sight of idiots placing minute amounts (1-2 grams) of Li, Na, K, Rb, and yes... caesium into bathtube with water. Anyway, big bang. So how come i cant find a single video with francium! Is francium that reactive that it cant be SHOWN?. I was also thinking, wouldnt it be efficient to make some kind of weaponized version of a francium or caesium bomb, where it contains both the alkali and some water? Anyway, appreciate any responses

Caesium in water by popular demand for The Periodic Table of Videos

When eating or drinking from glass containers, do we consume any microscopic particles of glass? And if so, are they harmful to ones health over time?