90308Lecture_4

90308Lecture_4 - Announcements • Graduate Reviews start...

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Unformatted text preview: Announcements • Graduate Reviews start Today! – Sign up immediately and attend this week • Workshops are still being scheduled • Quizzes What do these all have in common? Lead! Element # 82 Symbol: Pb Plumbum - Latin for metal Soft, weak, ductile, dull silver-grey metal Lead! • Alchemists • Romans - sapa - lead acetate • Crystal • Gasoline • Water/Soil/Fish • Paint • Home Remedies - azarcon, greta, pay-loo-ah • Cosmetics - Kohl • X-ray protection Paint Why Pb? Color and Durability • PbO - White • PbCO 3- White • PbCrO 4- Chrome Yellow • Litharge - Red Today’s Paint Binder, pigment, volatile drying agent • VOC’s - 50 g/L • 1978 - Lead < 0.06 % • Acrylic - polymer! Elements, Compounds, Mixtures • Element • Compound/Molecule • Mixture – Homogeneous/Heterogeneous Atomic Theory • Atom - smallest part of an element – Neutral – Spherical – Positively charged center – Negatively charged electrons • Subatomic particles – Protons, neutrons and electrons Atomic #, Mass # and Atomic Symbol...
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90308Lecture_4 - Announcements • Graduate Reviews start...

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