HW #3 - AP Biology Period 4 Liem Nguyen 9/12/09 Homework #3...

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AP Biology Period – 4 Liem Nguyen 9/12/09 Homework #3 (090918) Chapter 3 (due Friday 090918) Instruction: Type all answers use Font (Times New Roman) size 12 and use MS WORD. Retain electronic files. Print a hardcopy and turn in by the due date. Each assignment limited to 20-50 words answer (with a bullet-point outline when necessary). For Diagrams (Concept Map), hand-drawn and scan into WORD file. Rubrics: Each Homework Assignment: Total 20 points Three concepts Maps (5 points each) Total 15 points Overall 35 points 1. With the use of a diagram or diagrams, explain why water molecules are: a. polar b. capable of hydrogen bonding with four neighboring water molecules (1a.) The water molecule is made of two hydrogen atoms and one oxygen atom. It’s shaped like a wide V. From the diagram, it shows why water molecule is polar, because opposite ends of molecule have opposite charges. Oxygen region of molecule has partial negative charge, hydrogens have partial positive charge. (1b.) Slightly positive hydrogen of a water molecule attracts to slightly negative oxygen of another water molecule, held together by hydrogen bond. From diagram, shows that one water molecule can form four hydrogen bonds, because it has four valence electrons, and can fill or share up to eight valence electrons.
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2. List four characteristics of water that are emergent properties resulting from hydrogen bonding. The four characteristics of water that are emergent properties resulting from hydrogen bonding its cohesive behavior, ability to moderate temperature, expand upon freezing, and be versatile as a solvent. 3. Define
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HW #3 - AP Biology Period 4 Liem Nguyen 9/12/09 Homework #3...

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