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Chirality and SymmetryAll objects may be classified with respect to a property we call chirality (from the Greek cheir meaning hand). A chiral object is not identical in all respects (i.e. superimposable) with its mirror image. An achiral object is identical with (superimposable on) its mirror image. Chiral objects have a "handedness", for example, golf clubs, scissors, shoes and a corkscrew. Thus, one can buy right or left-handed golf clubs and scissors. Likewise, gloves and shoes come in pairs, a right and a left. Achiral objects do not have a handedness, for example, a baseball bat (no writing or logos on it), a plain round ball, a pencil, a T-shirt and
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submitted by goldknight (329 m) on 11 May 2008 14:13:04 IST (8 comments 74 views)
Stereoisomersisomers are different compounds that have the same molecular formula. When the group of atoms that make up the molecules of different isomers are bonded together in fundamentally different ways, we refer to such compounds as constitutional isomers. For example, in the case of the C4H8 hydrocarbons, most of the isomers are constitutional. Shorthand structures for four of these isomers are shown below with their IUPAC names.Note that the twelve atoms that make up these isomers are connected or bonded in very different ways. As is true for all constitutional isomers, each different compound has a different IUPAC name. Furthermore, the molecular formula pro
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submitted by goldknight (329 m) on 11 May 2008 14:07:19 IST (1 comments 48 views)
hi there all ... this is especially for those who are due to appear in the bitsat ... and are biting their nails off abt the paper ...so being a responsible goiitian , i thought it wud be my duty to help u all . i gave my bitsat today .. morning batch .so i wud be posting the experiences during the paper ..i hpe it wud be useful for u all ps : in the end those who are moe bothered abt the marks .... i habe posted them n the end ... see ...first of all the general level of the paper ...as far as i was concerned ....i found the paper to be much tougher than this years aieee...... especially the maths section was very time consuming .. and sometimes i
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submitted by amangem (712 m) on 14 May 2007 18:31:15 IST (22 comments 1374 views)
A Lesson in LifeEverything happens for a reason. Nothing happens by chance or by means of good or bad luck. Illness, injury, love, lost moments of true greatness and sheer stupidity all occur to test the limits of your soul. Without these small tests, if they be events, illnesses or relationships, life would be like a smoothly paved, straight, flat road to nowhere. If someone hurts you, betrays you , or breaks you heart, forg
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submitted by tarun_bits (629 m) on 7 May 2008 13:46:44 IST (35 comments 424 views)
This is the first Chapter of Richard P Feynman's Lectures on Physics. I have other Chapters as well But I cannot post them all together as it will be too big and cumbersome. I cannot promise this, but I will try to post the other topics as soon as possible. I have copied the illustrations in the end, they are numbered. You will have to scroll down everytime to see them. But don't worry as there are not many of them.This Chapter deals with the Atomic Theory, an idea that has revolutionised physics. The fact that it has been written by Richard Feynman, the nobel laureate makes it even more interesting to read. So go on and have fun reading it. Matter is m
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submitted by aamil4u (71 m) on 11 May 2008 20:14:39 IST (1 comments 60 views)
HEY GUYS, TRY LOOKIN AT THIS STUFF EVENHOPE ITS USEFUL! Numericals Based on Mole Concept Important Relationships 1 mole of an atom = 1 gram atomic weight of an atom 1 mole of a molecule = 1 gram molecular weight of molecule 1 mole of a gas = 22.4 liters of gas at STP 1 mole of a substance = 6.023 x 1023, atoms, molecules or ions 1 molar volume = 22.4 dm3 /L at STP
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submitted by vsraghuvar (52 m) on 9 May 2008 17:03:42 IST (4 comments 31 views)
this books are in complete mode. you can download it from here.http://www.esnips.com/doc/b2fb7333-c8ed-4df7-9450-75703a50ddca/physical-chemistry---atkins--paula http://rapidshare.com/files/86176889/ORGANIC_CHEMISTRY_4th_ed_-_Francis_A._Carey.pdfhttp://www.esnips.com/doc/760bf88d-e5f2-4aa5-b702-1b645906d8ba/Oxford-University-Press-Organic-Chemistry
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submitted by rdeoranjan (47 m) on 8 May 2008 16:58:46 IST (2 comments 130 views)
electromagnetic Induction: The Production of Electromotive force in a conductor when there is a change in the magnetic flux linkage with coil or when there is a relative motion of the conductor across a magnetic field. Magnetic Flux: Magnetic Flux through an area dS in a magnetic Field B is = B.dS Faraday's Law: When the Flux of a magnetic field through a loop changes, an emf is induced in the loop which is given by : = -d/dt Where = B.dS is the Flux through the loop. The EmF lasts as long as the magnetic Field
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submitted by waterdemon (5057 m) on 16 Sep 2007 14:55:33 IST (51 comments 1401 views)
Colonel SandersThere's no reason to be the richest man in the cemetery. You can't do any business from there.Roseanne BarrExperts say you should never hit your children in anger. When is a good time? When you're feeling festive?W.C. FieldsI am free of all prejudices. I hate everyone equally.Milton BerleThey've finally come up with the perfect office computer. If it makes a mistake, it blames another computer.George GobalIf it weren't for electricity we'd all be watching television by candlelight.Groucho MarxI find television very educating. Every time somebody turns on the set, I go into the other room and read a book.VoltaireIt is dangerous
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Close Window Cut-off BITSAT scores for Admissions to I Semester 2007-08 The cut-off BITSAT scores for admissions to I Semester 2007-08 to different programmes are given below. This is given here for information on the request of many candidates. Degree programme at Pilani Campus Cut-off BITSAT-2007 score B.E.(Hons.): Chemical 310
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submitted by kria (0 m) on 9 May 2008 22:58:39 IST (2 comments 276 views)
How NOT to Stop Bad Breath Get a copy of The Bad Breath Report,with a better cure for chronic bad breath by David Leonhardt Create a personalized plan for happiness today!" src="http://www.thehappyguy.com/Cover-personal-happiness-3D-click2.jpg" /> I must have been feeling particularly gutsy. "Pee-ew! You smell like the dump on the tenth day of a record-breaking chronic heat wave." I admit that it's not something I would say to Attila the Hun during a pre-battle sword-sharpening ceremony. But it was just my buddy Bart, and I was certain the Huns were busy causing trouble elsewhere. "Pee-ew! You have bad breath," I repeated. When the t
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Mining EngineeringDigging Your Future: Is a career in mining engineering right for you?By Eric Luchman E-mail this article Print this article RSS feedThe deep coalmines of West Virginia might seem a world away from the bustling offices of a big city engineering firm, but they are more connected than they might first appear. Before miners can delve into the earth's surface to extract raw materials, it takes top mining engineers to coordinate all of the challenges this process presents.If your idea of a nine-to-five job involves moving mountains (literally) and getting a bit dusty, then a career in mining engin
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Civil Engineering: Structuring Your CareerAging systems are creating a need for civil engineersBy Eric Luchman E-mail this article Print this article RSS feedStudents pursuing a career in civil engineering can rest assured that their skills will be needed to uphold the physical structures that keep society up and running. From refurbishing old highways to moving water from point A to point B to design our biggest skyscrapers, longest bridges and deepest tunnels, civil engineers play an imperative role in designing the structures that are a major part of our everyday li
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Bose-Einstein Condensation In 1924 Einstein pointed out that bosons could "condense" in unlimited numbers into a single ground state since they are governed by Bose-Einstein statistics and not constrained by the Pauli exclusion principle. Little notice was taken of this curious possibility until the anomalous behavior of liquid helium at low temperatures was studied carefully. When helium is cooled to a critical temperature of 2.17 K, a remarkable discontinuity in heat capacity occurs, the liquid density drops, and a fraction of the liquid becomes a zero viscosity "superfluid". Superfluidity arises from the fraction of heliu
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submitted by edison (3892 m) on 10 May 2008 10:33:44 IST (0 comments 26 views)
Laser Cooling Starting in about 1985 with the work of Steven Chu and others, the use of lasers to achieve extremely low temperatures has advanced to the point that temperatures of 10-9 K have been reached. If an atom is traveling toward a laser beam and absorbs a photon from the laser, it will be slowed by the fact that the photon has momentum p = E/c = h/λ.If we take a sodium atom as an example, and assume that a number of sodium atoms are freely moving in a vacuum chamber at 300K, the rms velocity of a sodium atom from the Maxwell speed distribution would be about 570 m/s. Then if a laser is tuned just below one of the sodium d-lines (589.0 and 589.6 n
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submitted by edison (3892 m) on 10 May 2008 10:13:19 IST (0 comments 17 views)
NCERT Textbook(a) MyopiaMyopia is also known as near-sightedness. A person with myopia …………………. This defect may arise due to excessive curvature of the eye lens, or (ii) elongation of the eyeball.(b) HypermetropiaHypermetropia is also known as far-sightedness… …………………….. This defect arises either because (i) the focal length of the eye lens is too long, or (ii) the eyeball has become too small.CorrectionMyopia and hypermetropia are due to problems associated with cornea. It doesn’t have much to do with eye lens.NCERT TextbookThis defect is called Pre
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submitted by Ankur_1 (48 m) on 8 May 2008 06:36:29 IST (7 comments 90 views)
About a hundred years ago David Hilbert, a German mathematician presented twenty-three math puzzles to the International Congress of Mathematicians. Today, only three remain unsolved. Added to those were four more unsolvable problems. The seven famous unsolved math puzzles that have resisted all attempts to solve are listed here: The Birch and Swinnerton-Dyer Conjecture, The Navier-Stokes Equation, The Poincare Conjecture, The Riemann Hypothesis (the oldest and most famous), The P Verses NP Problem, The Hodge Conjecture, Yang-Mills Existence and Mass Gap. Many experts believe that solving these problems would lead to extraordinary advances in physics, medicine and m
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submitted by a4asd (310 m) on 9 May 2008 08:04:39 IST (2 comments 93 views)
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