Biology Lecture 3

Biology Lecture 3 - Chemistry of Life Chapter 2 Organisms...

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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 Make up 96% of living matter
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Atoms The smallest unit of an element that still retains its distinctive chemical properties Composed of subatomic particles Protons: +1; 1 dalton (Da) Neutrons: no charge; 1 dalton Electrons: -1; no mass
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Atom Models Helium
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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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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 (different)
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This note was uploaded on 04/15/2008 for the course BIO 311C taught by Professor Satasivian during the Fall '08 term at University of Texas.

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Biology Lecture 3 - Chemistry of Life Chapter 2 Organisms...

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