[BIO 101] - Midterm Exam Guide - Comprehensive Notes for the exam (143 pages long!)
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2. 2: sketch a model of an atom of helium, showing the electrons, protons, neutrons, and atomic nucleus. Label the regions that are more positive or more negative: oxygen has a greater electronegativity than hydrogen, water is considered polar because the oxygen atom has a much stronger pull on the electrons than the hydrogen atoms. !3: explain what is happening in an ionic bond. De ne anion and cation and identify which element is the anion in salt. a. 2. 4: write the chemical shorthand equation for photosynthesis. Why is water considered polar: polar molecule: an uneven distribution of electrons in a covalent molecule, water is polar because the oxygen atom has a greater pull on the electrons than the hydrogen atoms. Ap biology - unit one: explain hydrogen bonding. In water, hydrogen bonds form between the hydrogen atom of one water molecule and the oxygen of another molecule.
