• Re: Finding an Unknown Element

    Updated: 2009-09-30 19:01:49
    Bismuth it is.

  • Re: Chemical Kinetics

    Updated: 2009-09-30 19:01:06
    Your work? Seems quite an easy problem to me... you only need to apply Arrhenius' equation

  • Re: Limiting Reagent Question (my own not a problem)

    Updated: 2009-09-30 18:58:19
    If they react 1:2 and you have twice as much of the second, neither is limiting - you just have stoichiometric amounts and they will be both used to the end.

  • Re: Titration, weak unknown acid with strong base! Help please..

    Updated: 2009-09-30 18:56:59
    No, its is not pH at the end point (nor equivalence point).Do you know Henderson-Hasselbalch equation?

  • Re: Finding an Unknown Element

    Updated: 2009-09-30 18:53:33
    Okay. Here is the work I've done. We know M = 1.402g and Br3 = 3.010g Thus: 3.010-1.402 = 1.608g Then I can write: 1.608g * (1 mole Br3 / 239.7g Br3) * (1 Mole M / 1 Mole Br3) = 0.006708 molesAnd finally: (1.402g M / 0.006708 moles) = 209.0 Therefore the unknown element is Bismuth, Bi. Is this correct?

  • The Periodic Table Of Videos

    Updated: 2009-08-18 14:53:13
    Tables charting the chemical elements have been around since the 19th century - but this modern version has a short video about each one.The Periodic Table Of Videos is an experiment by Professor Martyn Poliakoff of the University of Nottingham, UK.

  • Extreme makeover chemistry style

    Updated: 2009-08-18 14:53:13
    In revisiting a chemical reaction that's been in the literature for several decades and adding a new wrinkle of their own, scientists with Berkeley Lab and the University of California (UC) Berkeley have discovered a mild and relatively inexpensive procedure for removing oxygen from biomass. This procedure, if it can be effectively industrialized, could allow a number of of today's petrochemical products, including plastics, to instead be made from biomass........

  • Chemists synthesize herbal alkaloid

    Updated: 2009-08-18 14:53:13
    The club moss Lycopodium serratum is a creeping, flowerless plant used in homeopathic medicine to treat a wide variety of ailments. It contains a potent brew of alkaloids that have attracted considerable scientific and medical interest. However, the plant makes a number of of these compounds in extremely low amounts, hindering efforts to test their therapeutic value........

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