A question for chemists - I am doing a calculation about the energy requirements of taking CO2 at atmospheric pressure and temperature and compressing it to 2 MPa (2000 kPa, about 300 psi) and cooling it to -31ºC and am a bit uncertain about handling the phase change from gas to liquid. [more inside]
posted on Jul 24, 2008 - 7 answers

i want something sort of like this, only more to my liking. recommendations, please. [more inside]
posted on Apr 17, 2008 - 4 answers

Is there a chemical explanation for the density of an element or is it simply an innate physical characteristic? [more inside]
posted on Jan 21, 2008 - 14 answers

What is a bricks-and-mortar store at which I could buy a set of model elements / bonds - the molecule model things that students use as they are learning organic chemistry? [more inside]
posted on Jan 7, 2008 - 14 answers

What is the correct thermodynamic explanation for the fact that all monosaccharides with 5 or more backbone carbon atoms occur predominately in their cyclic form in solution?
posted on Dec 12, 2007 - 5 answers

ChemistryFilter: What chemicals are out there that can stain a t-shirt, but then be quickly dissolved with a chemical? Bonus points: Chemicals are safe enough for compost heap, and won't dissolve in a washing machine. [more inside]
posted on Dec 3, 2007 - 8 answers

NewAcademicJobFilter: What did/should you do, to start off a new academic job at a new institution and do it right? Lab? Colleagues? Students? People to know? Actions to take? How did you leave your own institution? [more inside]
posted on Jul 3, 2007 - 6 answers

"A human is halfway in size between an atom and the known universe"... This is a paraphrased quote I have come across several times. I like it. Who said it first? How true is it in the most literal sense? And, finally, what errors arrive in postulating a universe, or an atom, which can be measured AT ALL from our singular, relativistic, perspective? [more inside]
posted on Feb 18, 2007 - 14 answers

Measuring alcohol content without a hydrometer? [more inside]
posted on Jan 10, 2007 - 8 answers

What is the underlying physiological cause for paresthesia (tingling of the fingers) secondary to hyperventilation? Specifically, what metabolic or neurological process causes you to feel tingling in your fingers when you hyperventilate?
posted on Jun 30, 2006 - 2 answers

When I pour sugar in my coffee the total volume in my mug increases. What happen to the volume when the sugar dissolves (decreasing or stable ?) ?
posted on May 18, 2006 - 9 answers

Theoretically, if I needed large amounts of carbon, could I extract it from the air? How could I do it?
posted on Dec 6, 2005 - 18 answers

What would happen if you take a cube of ice, at a specific size, and fit it in an airthight glass box with the exact same dimensions, and then let it melt? [more inside]
posted on Jun 2, 2005 - 29 answers