Chapter 2 Chemical Foundations for Cells

Chapter 2 Chemical Foundations for Cells - Chapter 2...

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Chapter 2 Chemical Foundations for Cells I. The Chemistry In and Around You A. Life depends on chemical reactions. B. The application of chemical knowledge has produced products that provide benefits and problems for our world and its inhabitants. Consider the pesticides, for example. II. Organization of Matter A. Matter is anything that occupies space and has mass. 1. It includes solids, liquids, and gases. 2. Matter is made of some ninety-two naturally occurring elements; the four most abundant in humans are: O, C, H, and N (in decreasing order). a. Trace elements are present in very small, but critical, quantities. b. The symbol designation for each element is the same the world over. 3. Compounds are substances in which two or more elements are combined in fixed proportions. B. The Structure of Atoms 1. A molecule is a bonded unit of two or more (same or different) atoms. 2. An atom is the smallest unit of matter that is unique to a particular element. 3. Atoms are composed of three particles: a. Protons (p+) are part of the atomic nucleus and have a positive charge. Their quantity is called the atomic number (unique for each element). b. Neutrons are also a part of the nucleus; they are neutral. Protons plus neutrons =
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This note was uploaded on 01/04/2012 for the course BSC BSC1005 taught by Professor Orlando,rebecca during the Fall '10 term at Broward College.

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Chapter 2 Chemical Foundations for Cells - Chapter 2...

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