BIOL 005A Lecture Notes - Lecture 1: Chemical Polarity, Diatomic Molecule, Covalent Bond

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7 Jul 2018
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The chemical basis of life: review of atomic structure chemical reactions. All matter consists of elements : substances that cannot be broken down further by. When different elements are combined in particular ratios, they generate compounds , Compounds have different characteristics than their elements (h 2 o) emergent properties. The elements carbon, hydrogen, oxygen and nitrogen make up 96% of the mass of the human body. Each element consists of atoms: composed of neutrons , protons and electrons. The atomic nucleus consists of neutrons and protons, which have a similar mass of 1. 7 x 10 -24 g = 1 unified atomic mass unit (u) or dalton (da). Electrons have a mass (9. 1 x 10 -28 g) Because protons and electrons have opposite charge, if the net charge of an atom is zero, then it has the same number of electrons and protons.

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