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class1 - Class#1 Atoms Molecules CHEM 107 A Bengali Texas...

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Class #1 CHEM 107 A. Bengali Texas A&M University Qatar
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Chemistry & Engineering ? Materials Molecules Atoms Protons, Neutrons, Electrons ?
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Chemist’s Viewpoint: ) All matter is composed of atoms . ) Two or more atoms joined by a chemical bond form a molecule . ) “Think Molecules”
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Chemistry: 3 “Representations” ) Macroscopic or bulk: observations ) Symbolic:written description ) Microscopic/molecular:visualize molecules
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Atomic Theory of Matter ) Matter composed of atoms
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Atomic Theory of Matter ) Atoms combine in whole number ratios ) H 2 O, H 2 O 2 , H 3 O + , OH ) But no such thing as a fractional atom
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Atoms ) Atoms contain protons, neutrons, electrons ) ) Electrons surround nucleus ) protons: + charge ) electrons: – charge ) neutrons: no charge
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Atomic Weights ) Atoms have measurable masses. ) Atomic weight ” of an element is average mass of an atom of the element. (Why average?) ) Units: 1 amu = 1.66 x 10 –27 kg
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Periodic Table 6 C 12.01 Atomic Weight Atomic Number
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show simulation Chem interactive
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class1 - Class#1 Atoms Molecules CHEM 107 A Bengali Texas...

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