Slides1-1 - ORGANIC CHEMISTRY (CHEMISTRY 112 A) Guy...

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Science ? The observation, identification, description, experimental investigation, and theoretical explanation of natural phenomena Chemistry ? The science of substances - their structures and properties and the reactions that change them into other substances. Organic chemistry ? Why is carbon special ? Carbon, alone of all elements, is able to form an immense diversity of compounds, from the simple to the most complex - from methane, with one carbon, to DNA, which can have ten of billions. ORGANIC CHEMISTRY (CHEMISTRY 112 A) Guy BERTRAND Historically, the study of substances obtained from living sources. The chemistry of carbon compounds.
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ATOMIC STRUCTURE The different kinds of matter result from different combinations of atoms but what is an atom ? 1.5 10 -10 m 150 pm (picometer) 1.5 Å (angstrom) 3 10 -2 m 6 10 -6 m electrons nucleus 1 mm atom: 100 m ! atom nucleus
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ATOMIC STRUCTURE X A Z A : Mass Number = Number of protons + neutrons Z : Atomic Number = Number of protons = Number of electrons A-Z = Number of neutrons X A' Z X A Z and with A = A' are isotopes X: Symbol of the element Atomic Weight = Average mass number of an element (amu) electron mass: 9,11 10 -31 kg charge: -1.6 10 -19 C (-1) neutron mass: 1.67 10 -27 kg = 1 amu charge: 0 proton mass: 1.67 10 -27 kg = 1 amu charge: 1.6 10 -19 C (+1)
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HOW ARE THE ELECTRON DISTRUBUTED IN AN ATOM Orbitals: solution of a wave function mathematically describing the motion of an electron around the nucleus. The shape of an orbital tells us the volume of space around the nucleus where an electron can most likely be found. There are 4 kinds of orbitals: s , p , d, f.
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Slides1-1 - ORGANIC CHEMISTRY (CHEMISTRY 112 A) Guy...

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