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Water

Water. Ch. 3. Water is essential to life. Biological Importance of Water. Water is abundant on Earth Life evolved in water All cells contain water Biochemical reactions occur in water. +. +. -. Polar Covalent Bond. H2O doesn’t share e- evenly Oxygen atom is electronegative

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Water

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  1. Water Ch. 3

  2. Water is essential to life

  3. Biological Importance of Water • Water is abundant on Earth • Life evolved in water • All cells contain water • Biochemical reactions occur in water

  4. + + - Polar Covalent Bond • H2O doesn’t share e- evenly • Oxygen atom is electronegative • Hydrogen atoms are slightly positive

  5. Hydrogen Bonding • Occurs when two water molecules interact • This bonding type allows water to have unique properties vital for living things

  6. Liquid Awesome • https://www.youtube.com/watch?v=HVT3Y3_gHGg

  7. Properties of Water

  8. 1. Cohesion & Adhesion • Water molecules stick together & other molecules • Important for: • Surface tension • Capillary action

  9. 2. Good solvent • Water dissolves other polar molecules • Salt, glucose, and enzymes • Water does not dissolve nonpolar molecules • Lipids

  10. 3. Moderation of Temperature • Water has a high specific heat • a lot of energy is required to change its temperature. • Water creates stable environment

  11. 4. Heat of vaporization & fusion • Water evaporates if provided with energy • Sweating removes heat from living organism • Water freezes if provided with energy • Cells resist freezing

  12. 5. Floating ice insulates water • Less dense as solid than liquid

  13. 6. Water Disassociates • H shifts from one H2O molecule to another • Result: • a hydronium ion (+) & a hydroxide ion (-) • Buffers protect life from extreme pH solutions

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