09042007 - Atoms & Molecules

09042007 - Atoms & Molecules - Schedule for Today...

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-Overview of Basic Chemistry -Students should know the parts of an atom -Chemical Bonding -Students should know ho atoms form different kinds of chemical bonds -Important of Water -Students should be able to explain the properties of water and its biological importance -Announcements -Lecture Quiz Overview of Basic Chemistry - Atom : smallest possible unit of matter that retains properties of its element -Subatomic Particles: - Neutrons - Protons - Neutrons -- Electrically neutral atoms have an equal number of protons and electrons -- Atomic Number is the numb er of protons Isotopes: atoms of an element that have same atomic number, but different mass number Electrons are in orbit around the nucleus and are involved in chemical reactions -Contain potential energy (discrete steps) Orbital : three-dimensional space where an electron will most likely; be found 90% of the time (Fig 2.4) -First energy level: one s orbital, holds 2 electrons -Second energy level: one s and there p orbitals, holds 8 electrons. Oxidation-Reduction
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09042007 - Atoms & Molecules - Schedule for Today...

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