Adv' Bio Ch' 2 Essential Chemistry for Biology

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Adv. Bio Ch. 2 Essential Chemistry for Biology

• Your body is a chemical system. At its most
  basic level, life is all about chemicals and how
  they interact.
• Overview
• Ecosystem
• Community
• Population

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• Organism
• E. Organ System
• F. Organ
• G. Tissue
• H. Cells
• I. Molecule

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• J. Atoms
• II. Basic Chemistry
• Matter
• Elements
• -25 are essential to life
• -4 make up 96 of the human body
• -trace elements
• 2) Compounds

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• B. Atoms
• Structure of Atoms
• a) subatomic particles
• b) nucleus
• c) atomic number
• d) mass number

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2) Isotopes -radioactive isotope -useful in
medicine - PET scan -too much harmful -radon
detectors
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• 3) Electron Arrangement and Chemical Properties
• C. Chemical Bonding
• Ionic Bond
• held together by oppositely charged ions
• -ions

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2) Covalent bonds -atoms held together by
covalent bonds form a molecule H2 D. Chemical
Reactions -reactants convert to products -cannot
create or destroy matter, can only rearrange
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• III. Water and Life
• Structure of Water
• Polar Molecule

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• B. Waters life-supporting properties
• The polarity and hydrogen bonding of water lead
  to 4 of waters properties
• Cohesion of water
• -important in the living world
• -surface tension

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2) Water moderates temperature Heat Temperature
Evaporative cooling
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3) Biological importance of ice floating
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4) Water as the solvent of life Solution Solvent
Solute Aqueous solution
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• C. Acids, Bases and pH
• Acid
• 2) Bases
• 3) pH scale
• -each unit is a tenfold change in the
  concentration of H
• -water neutral
• -buffers
• -change