BIOLOGY REVIEW SESSION 1

BIOLOGY REVIEW SESSION 1 - BIOLOGY REVIEW SESSION 1...

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BIOLOGY REVIEW SESSION 1 Chemistry Background Elements: pure substances that cannot be proken down into 2 or more simpler substances (periodic table) Atoms: smallest unit into which an element can be divided Compound: substances that can be broken down to two or more elements Components of an Atom Nucleus Protons and Neutrons Electrons Atomic number is equal to the number of protons Atomic Mass is the number of protons and neutrons Electrical Charge Number of electrons= number of protons In an ion, the number of electrons is not equal to the number of protons Valence vs Valence Electrons Valence is the number of electrons needed to fill the outermost shell of an atom Valence electrons are the electrons contained in the outermost shell of an atom Chemical bonds Forces holding atoms together in molecules What determines the number and type of chemical bonds? -Number-valence -Type=electronegativity Measure of the attraction an atom has for electrons Strong bonds are covalent bonds Involve sharing of electrons Ionic bonds Electron taken from one atom and transported to the other Weak bonds Polar bonds Unequal sharing of electrons Partial + and partial – regions Hydrogen bonds Weak (non-covalent) bonds Between partial positive and partial negative charges Moles and Molar concentrations
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This note was uploaded on 11/03/2011 for the course BIO 1201 taught by Professor Sibenaller during the Fall '10 term at LSU.

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BIOLOGY REVIEW SESSION 1 - BIOLOGY REVIEW SESSION 1...

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