classrooms. Although we do not need to worry about lead poisoning from pencils‚ (pencil lead is really graphite)‚ (From graphite to pencil‚ Ali Mitgutsch‚ 1985) when misused a pencil is a deadly weapon‚ one far worse than a pocketknife. One obvious alternative‚ which would thrill many
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Work? When you touch the free ends of the alligator clips to your "super battery‚" you form a complete circuit. That means electricity flows freely through the entire apparatus that you have just built. This flow of electricity channels through the graphite-based mechanical pencil refill that is connected by alligator clips. The flowing electricity has a noticeable effect on the pencil
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INORGANIC CHEMISTRY – CLASS XI (ISC) Properties of Group 1 elements [Alkali metals] 1. Due to high reactivity‚ alkali metals do not occur free in nature. Elements of group 1 (or IA) are known as alkali metals because their hydroxides are soluble in water and form strongly alkaline solutions. Alkali metals are stored under kerosene oil because they get tarnished on exposure to air. 2. The general electron configuration of alkali metals is ns1. 3. Alkali metals have largest size and lowest
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globally major mineral sector was centered by hydrocarbons‚ and rated first in making silver‚ bismuth (28% from your planet?ˉs full)‚ and celestite (strontium mineral 50% of globe output) 2nd in fluorspar (14% of world output) 4th in arsenic and graphite fifth in molybdenum 1 with the leading ten in barite‚ cadmium‚ gypsum‚ mine direct‚ manganese ore‚ salt‚ sulfur‚ and mine zinc as well as inside the very best 15 in mine copper‚ cement‚ gold‚ and crude metal (secondlargest producer in Latin The usa)
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C2.1.1 Structure and bonding a) Compounds are substances in which atoms of two or more elements are chemically combined. b) Chemical bonding involves either transferring or sharing electrons in the highest occupied energy levels (shells) of atoms in order to achieve the electronic structure of a noble gas. c) When atoms form chemical bonds by transferring electrons‚ they form ions. Atoms that lose electrons become positively charged ions. Atoms that gain electrons become negatively charged
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Centre Number Surname Other Names Candidate Signature Candidate Number For Examiner’s Use Examiner’s Initials Question Mark General Certificate of Secondary Education Foundation Tier June 2011 1 2 3 4 5 6 7 TOTAL Additional Science Unit Chemistry C2 CHY2F Chemistry Unit Chemistry C2 Wednesday 25 May 2011 For this paper you must have: the Data Sheet (enclosed). You may use a calculator. F 9.00 am to 9.45 am Time allowed 45 minutes Instructions Use
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Shaun Tan Shaun Tan‚ born in 1974‚ is an award winning illustrator and author of many well-known children’s books. Tan was born and raised in Fremantle‚ Western Australia‚ where as a boy‚ spent his time writing and illustrating poems and stories. Tan was known at his primary school as very talented artist. Through out high school‚ Tan continued his passion for illustrating‚ where he was enrolled in a special art program for gifted students. However‚ Tan eventually took an academic path into university
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Tennis Racket Table content History …………………………………………………………………………………....3 History of Tennis………………….………………………………………………......3 History of Tennis Racke………………………………………………………..……..4 Tennis Racket and Biomechanics...………………………………………………………7 Modern Tennis Racket………………………………………………………………....7 Strings………………………………………………………………………………….7 Biomachnicas…………………………………………………………………………..9 Injuries and Future Development……………….………………………………………..13 Injuries…………………………………………………………………………………
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bombs dropped Framed the introduction of fission to the world - 1940: Heavy water (Kowarski‚ Joliot-Curie‚ von Halban) o D2O = 1/7000 particles within H2O - 1941-42: George Laurence performed world’s first large-scale fission experiments in graphite o Not a full-scale nuclear reactor o Done before E Fermi built the first nuclear reactor in 1942 in Chicago - Aug 1942: CD Howe “minister of everything” – “Okay‚ let’s go” Canada entered nuclear field - 1944: Chalk River selected as site for
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Conventionally‚ solid carbon has two main structures called allotropic forms: diamond and graphite: - Diamond is tetrahedrally bonded through sp3 hybrid bonds that form a 3D network. - Graphite has a layered structure with each layer called graphene formed by sp2 hybrid bonds that make 120° angles with each other. Hexagonal graphene sheets are held together by weak van der Waals forces. Z Diamond Graphene Graphite C60 y x Allotropies of C CNT Amorphous C 4-1 s 4-2 Types of
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