Chapter 2_3_F10 - Chemical bonds and Water You are...

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Chemical bonds and Water
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You are responsible for studying and understanding chapter 2 pages 30-40. This will not be covered in class but will be present in exams
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Types of chemical bonds Covalent bonds Ionic bonds Hydrogen bonds Van der Waals interactions Hydrophobic interactions
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Animation Electron shells and chemical reactivity
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Using electronegativities to determine bond type EN > 1.7 ionic bond - transfer EN < 1.7 polar covalent bond – unequal sharing EN < 0.4 non-polar covalent bond - sharing EN = 0 completely non-polar covalent bond
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Weak chemical bonds Van der Waals interactions Hydrogen bonds Hydrophobic interactions
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Van der Waals Interactions Occur when transiently positive and negative regions of molecules attract each other
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Hydrogen Bonds δ δ + δ + Water (H 2 O) Ammonia (NH 3 ) O H H δ + δ N H H H A hydrogen bond results from the attraction between the partial positive charge on the hydrogen atom of water and the partial negative charge on the nitrogen atom of ammonia. δ + δ + Figure 2.15 WEAK! READILY BROKEN!
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Water – pg 46 to 54
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Water is polar
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H-bonding in water
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