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Water

Water. Water Basics. Polar : part of a molecule is slightly positive, while another part is slightly negative Oxygen “hogs” electrons from hydrogen 8 protons: 10 electrons Negative charge Hydrogen without electrons 1 proton: 0 electrons Positive charge

madison-harrington
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Water

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  1. Water

  2. Water Basics • Polar: part of a molecule is slightly positive, while another part is slightly negative • Oxygen “hogs” electrons from hydrogen • 8 protons: 10 electrons • Negative charge • Hydrogen without electrons • 1 proton: 0 electrons • Positive charge • Creates hydrogen bonds where one water sticks to another

  3. Red = Oxygen (negative) White = Hydrogen (positive) - - - - - - - - - + + + + + + + + + + + + + + + + + + - - - - - - - - + + + + + + + + + + + + + + + + + + - - - - - - - - - + + + + + + + + + + + + + + + + + +

  4. WaterProperties • Energy needed to break H bonds • High specific heat: Resists temp changes • Helps to maintain a constant body temp • Cohesion: polar water molecules attracted to other polar water molecules (see bug picture) • Adhesion: polar water sticks to other molecules

  5. Solutions • Solution: mixture where 1 substance dissolves in another • 2 parts to a solution 1) Solute: substance that dissolves in a solution • Atoms, ions, molecules 2) Solvent: substance in which the solute is dissolve • Usually water • Ex: Human blood • Plasma (water) is the solvent • Carbs, proteins, sugars, etc… is the solute

  6. pH Scale • pH scale measures the amount of H+ ions • Some molecules release H+ ion when dissolved • H+ ions accumulate (acids) • Some molecules release OH- ions when dissolved • OH- ions accumulate (bases) • pH balance vital to life • Ex: Proteins break apart when outside normal pH

  7. 1) Name 4 basic features of water. 2) Which water property explains that one atom is positively charged, while another is negatively charged? 3) How does cohension and adhesion differ? 4) Which is a stronger acid? Substance A with a pH of 5 or substance B with a pH of 3? 5) Which has more H+ ions? Substance A with a pH of 5 or substance B with a pH of 3? 6) Which has more OH- ions? Substance A with a pH of 5 or substance B with a pH of 3?

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