2.2 2.3 Shapes of molecules and ions 2.3a Electron pair repulsion theory a demonstrate an understanding of the use of electron-pair repulsion theory to interpret and predict the shapes of simple molecules and ions In a chemical species like a molecule or ion‚ pairs of electrons create negative centres that surround the central atom. These electron pairs repel each other and arrange themselves to be as far apart as possible‚ thus minimising repulsion. [pic](source: http://www.mikeblaber.org/oldwine/chm1045/notes/Geometry/VSEPR/Geom02
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Chemist Vilas Pol inserted plastic bags into a specialized reactor in order to heat them to 700 degrees Celsius. This heating resulted in a fine black powder which contains tiny carbon spheres. This powder can form carbon nanotubes if a cobalt-based catalyst is added during the heating. The carbon nanotubes and carbon spheres formed from the plastic bags can be used to manufacture lithium-ion batteries‚ which powers most electronic devises and even electric cars. They are also useful in the tire
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Adventures of Zircon and Carbon Zircon and Carbon were brothers from the Triangulum Galaxy. They are two twin aliens that stood 6’7 and were a stunning color of mint green. They traveled 2.7 light years to get to Earth for a special mission. The mission was currently unknown. They were rushed on to a spacecraft and only sent with coordinates and supplies to lead them along the way. The coordinates they had read “Latitude: -64.15164‚ Longitude: -10.58414‚ Distortion: 5.26.” The spacecraft finally
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they must be Hydrogen‚ Carbon‚ Nitrogen and Oxygen. These four elements make up the majority of all Biological compounds. Without them‚ life on this planet as we know it could not exist. Due to the bonding possibilities between and among these elements‚ literally millions of organic compounds are possible. Carbon is the backbone of all organic compounds. It forms the main structure of the molecule with Hydrogen‚ Nitrogen‚ Oxygen and occasionally other elements replacing Carbon or bonding to it at
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How a faster pulse rate after exercise affects the amount of carbon dioxide in breath and how males and females pulse rates change or don’t after exercise Introduction There is a chemical reaction that takes place in this lab‚ O2 + C6H12O6 –> H2O + CO2 + ATP. This represents cellular respiration‚ the reaction. The reactants are Oxygen and Glucose. The products are water‚ carbon dioxide‚ and ATP. This reaction is split into 3 stages‚ the Glycolysis stage‚ the Krebs cycle‚ and the Electron Transport
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Until the discovery of Bucky ball‚ the graphite and diamond were the only molecules formed using carbon atoms. Even though the founder of Bucky ball was curl‚ Kroto and Smalley‚ the fullerene molecule was named after Richard Buckminster fuller (1895-1983) an famous architect‚ because the structure of Bucky ball looks same as that of the geodesic dome
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polluting the environment because greenery add oxygen to environment filters the air. Atmospheric pollution as a result of emission of carbon monoxide‚ Sulphur oxides and hydrocarbons has become a subject of growing concern and has led to increasing pressure for restrictions of burning of fossil fuels. It is estimated that currently more than 20 billion tons of carbon dioxide are being released in the atmosphere in this way every year. The discharge of these air pollutants is infecting and destroying
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"In mineralogy‚ diamond (from the ancient Greek αδάμας – adámas "unbreakable") is an allotrope of carbon‚ where the carbon atoms are arranged in a variation of the face-centered cubic crystal structure called a diamond lattice. Diamond is renowned as a material with superlative physical qualities‚ most of which originate from the strong covalent bonding between its atoms. In particular‚ diamond has the highest hardness and thermal conductivity of any bulk material. ELECTRICAL CONDUCTANCE: - . Diamond
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• The Main Markets for Carbon Exchange ✓ About Chicago Climate Exchange (CCX) Chicago Climate Exchange (CCX)‚ launched in 2003‚ is the world’s first and North America’s only active voluntary‚ legally binding integrated trading system to reduce emissions of all six major greenhouse gases (GHGs)‚ with offset projects worldwide. Please see http://www.chicagoclimatex.com/ ✓ About European Climate Exchange (ECX) The European Climate Exchange (ECX) was launched by CCX in 2005‚ and is now
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CARBON 6 9 ( 2 0 1 4 ) 6 3 8 –6 4 0 Available at www.sciencedirect.com ScienceDirect journal homepage: www.elsevier.com/locate/carbon Letter to the Editor Carbon nanodots with strong nonlinear optical response Dezhi Tan a‚ Yuya Yamada b‚ Shifeng Zhou c‚ Yasuhiko Shimotsuma b‚ Kiyotaka Miura b‚ Jianrong Qiu a‚c‚* a State Key Laboratory of Silicon Materials‚ Department of Materials Science and Engineering‚ Zhejiang University‚ Hangzhou‚ Zhejiang 310027‚ PR China b Department of Material Chemistry
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