Chapter 2_3_Spr11

Chapter 2_3_Spr11 - Chemical bonds and Water Chapters 2 and...

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Unformatted text preview: Chemical bonds and Water Chapters 2 and 3 Some slides adapted from: www.biologyjunction.com/ waterproperties . pp • 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 Types of chemical bonds • C o va le nt b o nds • Io nic b o nds • Hydro g e n b o nds • Va n de r Wa a ls inte ra c tio ns • Hydro pho b ic inte ra c tio ns 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 Weak chemical bonds • Van der Waals interactions • Hydrogen bonds • Hydrophobic interactions Van der Waals Interactions – Occur when transiently positive and negative regions of molecules attract each other Water is polar Hydrogen bond • Intermolecular bond • Between polar molecules where one of the atoms involved is H Water – pg 46 to 54 Properties of water • Clings to polar molecules – Cohesion – Adhesion • High specific heat • High heat of vaporization • Denser as a liquid than solid • The solvent of life 1) Water clings to polar molecules 2) Temperature stabilization A) High Specific heat Celsius Scale at Sea Level 100 o C Water boils 37 o C Human body temperature 23 o C Room temperature o C Water freezes B) High heat of vaporization 3) Denser as a liquid than solid...
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This note was uploaded on 01/23/2011 for the course BIO 311C taught by Professor Satasivian during the Spring '08 term at University of Texas.

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Chapter 2_3_Spr11 - Chemical bonds and Water Chapters 2 and...

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