「Boron」に関連した動画の一覧 |
 | Boron - Periodic Table of Videos Boron can be used to produce green flames. More about the elements at www.periodicvideos.com 2008年07月10日再生回数 133024 |
 | Make Elemental Boron In this video, I isolate elemental Boron over a number of steps, starting with boric acid! (I was fighting off a bit of a cold, so if my narration sounds like I'm bored that's why :) ) Here's the procedure: Start with 15g of boric acid and heat it over medium heat for about a half hour until it dehydrates to boric oxide, B2O3. The transition is very easily visible, as the powder "melts" into a sticky, glassy mass. Next let the boric oxide cool, then pry it off the dish and crush it up into a fine powder (NOT an easy process - this stuff is extremely hard and tenaciously sticks to the dish. Be sure to heat it on something you don't mind destroying to get it off.) Then, we essentially want to make a thermite out of it by thoroughly mixing it with a roughly equal weight of magnesium powder. I recovered 8.2g of B2O3 and used 9g of Mg. Stoichiometrically, only 8.4g of Mg is needed but I wanted to make sure all of the B2O3 was used up. Ignite the mix using your favorite thermite ignition method, and immediately cover the reaction once it's finished. This is to prevent the boron that is produced from re-oxidizing in the air while it's still hot. Let it cool, and then remove the cover. Break up the fused reaction products into smaller pieces, and pour some water on everything to cover it up. Then _slowly_ add hydrochloric acid. Extreme care should be taken at this step, because adding the acid produces a lot of gas, is extremely exothermic, and might evolve explosive diborane gas ... 2011年02月21日再生回数 12857 |
 | What Is Boron What Is Boron Name Origin From borax and carbon. "Boron" in different languages. Sources Obtained from kernite, a kind of borax (Na2B4O7.10H2O). The world wide commercial borate deposits are estimated to be 1010 kg of boron. The USA, Tibet, Chile and Turkey are important producers. Around 1 million tons of boric anhydride (B2O3) are produced each year.Abundance Universe: 0.001 ppm (by weight) Sun: 0.002 ppm (by weight) Carbonaceous meteorite: 1.6 ppm Earth's Crust: 950 ppm Seawater: 4.41 ppm Human: 700 ppb by weight 410 ppb by atoms Uses Used with titanium and tungsten to make light weight heat resistant alloys. Also tennis rackets, regulators in nuclear plants, heat resistant glass and eye disinfectant. Boric acid (H3BO3) is used an insectiside, mostly against ants or cockroaches. Boron nitride is a material in which the extra electron of nitrogen (with respect to carbon) enables it to form structures that are isoelectronic with carbon allotropes. Sodium tetraborate decahydrate (Na2B4O7 - 10H2O) or borax, used in the production of adhesives, in anti-corrosion systems and many other uses. Sodium tetraborate pentahydrate (Na2B4O7 - 5H2O), which is used in large amounts in making insulating fiberglass and sodium perborate bleach. Orthoboric acid (H3BO3) or boric acid is used in the production of textile fiberglass, flat panel displays and eye drops. Boron slurry is used as an energetic material with very high energy density like rocket fuels and jet engines. 2010年12月19日再生回数 2723 |
 | Boron Tribromide - Periodic Table of Videos Debbie, our self-confessed Boron lover, demonstrates the fuming of Boron Tribromide. More chemistry at www.periodicvideos.com 2010年03月19日再生回数 34102 |
 | Introducing Boron (16/31) Free learning from The Open University www.open.ac.uk --- A brief description of Boron. (Paart 16 of 31) --- Study 'Exploring science' with the OU www3.open.ac.uk Explore qualifications in Science with the OU www3.open.ac.uk --- 2009年09月04日再生回数 3998 |
 | Robert de Boron / Take Your Turn feat. Collective Efforts Robert de Boron 1st album 「Diaspora」 2010.10.20 in stores 2010年11月28日再生回数 22631 |
 | Boron-Dymka miru Kapelka ze sokolovska..... 2007年01月22日再生回数 10713 |
 | Robert de Boron / Shine A Light (Let's Love) feat. Awa & Junz Robert de Boron 1st album 「Diaspora」 2010.10.20 in stores 2010年10月22日再生回数 76774 |
 | X3 TC - War Series Episode II (Boron Wars) This is the second episode to my X3 Terran Conflict War Series, this time featuring mainly the Boron battling against their long-time enemies the Split, Xenon, Pirates and Kha'ak. Hope you guys enjoy the vid, feel free to comment and rate it. Song is from the soundtrack file I found in the actual game, so credit for this song goes to Egosoft. 2009年11月23日再生回数 10247 |
 | Lewis Dot Structure of BCl3 (Boron TriChloride) I quickly take you through how to draw the Lewis Structure of BCl3, (Boron TriChloride). I also go over formal charge, hybridization, shape and bond angle. 2011年10月01日再生回数 10429 |
