01:119:115 Lecture Notes - Lecture 2: Chemical Polarity, Atomic Mass, Hydrogen Bond
1 Oct 2016
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Lecture 2- the scientific process and chemistry: methods of investigating biology. Investigated in a systematic manner (chap 1. 1 and 1. 3) Hypothesis: testable explanation for observations based on available data. Theory: broad explanation with significant support: the scientific process. Basic elements of chemistry: 25 / 92 elements essential to life. Four make up 96% of living matter chon. Rest are trace elements: properties of atoms depend on structure. Atomic number = # of protons in atoms. Isotopes = two atoms of an element that differ in number of neutrons. C12, c13, c14: types of chemical bonds. Types of covalent bonds (c. 1. d. 1) nonpolar covalent bond (c. 1. d. 1. a) then e- is shared equally (c. 1. d. 2) polar covalent bond (c. 1. d. 2. a) then e- is shared unequally. Unequal sharing of electrons causes a partial charge for. Between atoms (c. 2. a. 1) one atom steals e- from the others. After the transfer of an electron- both atoms have.
