BIO
09-08-06 (4) Water Outlin0e

09-08-06 (4) Water Outlin0e - Lecture Overview Review...

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Lecture Overview Review & Finish Chemical Bonding Water
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Review Atomic number, mass number Electron configuration Covalent bonds: Ionic bonds:
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Hydrogen Bonds δ - δ+ δ - δ+ δ+ δ+ δ+
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Van der Waals Interactions Occur when transiently positive and negative regions of molecules attract each other ‘Hot spots’ of partial charge Occur in nonpolar molecules Weak
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Chemical Reactions Chemical reactions make and break chemical bonds A Chemical reaction Leads to changes in the composition of matter Matter is conserved - reactions only rearrange
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Chemical Reactions Convert reactants to products 2 H 2 O 2 2 H 2 O + +
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Chemical Reactions Reversible Reactions: Chemical Equilibrium 3 H 2 + N 2 2 NH 3
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Water September 8, 2006
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Water Water is the biological medium Cells are 70-95% water 75% of Earth’s surface is submerged in water Present as liquid, solid, and gas
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Outline Polarity of water molecules results in hydrogen bonding Emergent properties of water Dissociation of water molecules and pH
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Water molecules are polar
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Hydrogen bonding Hydrogen bonds + + H H + + δ δ δ δ
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