To Do… OWL Lectures Discussion Chapter 10 due Friday, March 30

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Presentation transcript:

To Do… OWL Lectures Discussion Chapter 10 due Friday, March 30 Chapter 11 due Friday, April 6 Lectures Continue reading Chapter 11 Discussion Chapter 10 and Chapter 11 text homework

Clicker Question Is the freezing of water an endothermic or exothermic process? (The system is underlined.) A) endothermic B) exothermic C) neither

Big Ideas – Periodic Table Originally arranged by atomic mass (protons not discovered). See Co & Ni; Te & I. Separated as “metals” and “nonmetals” (appearance/properties) Chemical reactivity

Big Ideas – Periodic Table The closer together the elements on the periodic table, the more chemically alike they are. Especially true for elements in the same column. “Missing” elements were predicted.

Big Ideas – Models Models are not reality. We use different models for different reasons. A model should be as simple as possible, but not simpler (Einstein) To answer more questions, the model must be more complex.

Various Atomic Models (Ch. 4) Dalton: Indivisible atoms J.J. Thomson: Atoms emit tiny negative particles. (Therefore atoms not indivisible!) Rutherford: Some α-particles bounce back when shot at atoms. (There is a concentration of mass with a positive charge in the atom.) http://www.youtube.com/watch?v=5pZj0u_XMbc

Water vs liquid nitrogen