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Water

Water. I. Water. A. The Molecule 1. O—H bond is highly polar 2. Bond angle 105 ° making it Bent shaped 3. Water Molecule as a whole is polar 4. Attracted to each other by intermolecular hydrogen bonds. Greater electronegativity. I. Water (cont.). B. Important Properties

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Water

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  1. Water

  2. I. Water A. The Molecule 1. O—H bond is highly polar 2. Bond angle 105° making it Bent shaped 3. Water Molecule as a whole is polar 4. Attracted to each other by intermolecular hydrogen bonds Greater electronegativity

  3. I. Water (cont.) B. Important Properties 1. High surface tension 2. low vapor pressure • hydrogen bonds hold molecules to one another, tendency to escape surface is low 3. high specific heat capacity • 4.184 J/g×°C 4. high melting and boiling points • 0°C and 100°C

  4. I. Water (cont.) C. Surface Tension – inward force, or pull, that tends to minimize the surface area of a liquid • Surfactant – wetting agent such as soap or detergent that decreases the surface tension by interfering with hydrogen-bonding Responsible for high surface tension

  5. I. Water (cont.) D. Atypical Ice 1. As a typical liquid cools, density increases b/c Volume decreases as the mass stays constant 2. As water cools it first behaves like a typical liquid until it reaches 4°C 3. Below 4°C the density of water starts to decrease **Ice is one of only a few solids that float in their own liquid.

  6. Atypical Ice Do not need to write. °

  7. Atypical Ice Why does ice behave do differently? Open framework arranged like a honeycomb. Framework collapses, molecules packed closer together, making it more dense

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