9-1-07 lesson 2 - Chemistry of Life Chapter 2 Organisms are...

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Chemistry of Life Chapter 2
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Organisms are composed of matter Matter Anything that takes up space and has mass Made up of elements Element A substance that cannot be broken down to other substance by chemical reactions An element’s properties depend on the structure of its atoms
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Periodic Table of the Elements
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Elements C,H,O,N
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Atoms The smallest unit of an element that still retains its distinctive chemical properties Composed of subatomic particles Protons Positive 1 dalton Neutrons Neutral No charge 1 dalton Electrons Negative Negible mass Electron cloud
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Atom Models
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Atoms Atoms of the different elements differ in their number of subatomic particles Atomic Number Number of protons Unique to each element Mass Number Number of protons + neutrons Approximation of atomic mass Not always the same for an element
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Isotopes Atoms of a given element may occur in different forms Differ in the number of neutrons Same number of protons Atomic number vs. mass number
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Electrons Negatively charged electrons are attracted to positively charged nucleus
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This note was uploaded on 02/16/2010 for the course CE BIO 311C taught by Professor Whedelt during the Spring '10 term at University of Texas-Tyler.

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9-1-07 lesson 2 - Chemistry of Life Chapter 2 Organisms are...

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