Biology Chapter 2 Objectives

Biology Chapter 2 Objectives - Chapter 2 The Chemical...

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Chapter 2 The Chemical Context of Life Elements and Compounds 1. An element is a substance that cannot be broken down to others substances by chemical reactions. A compound is a substance consisting of two or more different elements combined in a fixed ration. Therefore, compounds are composed of elements. 2. Oxygen, Carbon, Hydrogen, and Nitrogen make up 96% of living matter. 3. Trace elements are those required by an organism in only minute quantities. For example, iron is needed by all forms of life. Atoms and Molecules 4. Simplified model of an atom: Electrons Nucleus This model simplifies our understanding of atomic structure because in reality, the electrons are in an electron cloud, where there is a high probably that they will be found there. The electrons are like actually fan blades, since they do not have a definite location, and are constantly moving. 5. a. A neutron is an electrically neutral particle. Protons however, are positively charged. b. Atomic number is the number of protons an element has. Mass number is the
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This note was uploaded on 08/29/2009 for the course BIOL 101 taught by Professor Sakji during the Fall '08 term at Linn Tech.

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Biology Chapter 2 Objectives - Chapter 2 The Chemical...

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