Chapter 2

Chapter 2 - Chapter 2 The Chemical Context of Life Concept...

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Chapter 2 The Chemical Context of Life Concept 2.1 Matter consists of chemical elements in pure form and in combinations called compounds. Organisms are composed of matter, which is anything that takes up space and has mass. Matter is composed of elements. An element is anything that cannot be broken down any further by chemical reactions. There are 92 elements. o 4 of the 92 elements make up about 96% of living matter, called the Essential Elements of Life. Table 2-1. Carbon Hydrogen Oxygen Nitrogen o Trace Elements: required in small quantities in an organism, but very important. Fig 2-4a Fig 2-4b Concept 2.2 An element’s properties depend on the structure of its atoms. An atom is the smallest unit of matter that still retains the properties of an element. Atoms are composed of subatomic particles (fig 2-5): o Proton- one unit of positive charge o Electron- one unit of negative charge o Neutron- no charge o Protons and neutrons pact together tightly in the nucleus. o
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This note was uploaded on 05/10/2010 for the course BIOL 1201 taught by Professor Wishtichusen during the Summer '07 term at LSU.

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Chapter 2 - Chapter 2 The Chemical Context of Life Concept...

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