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KEY CONCEPT Water’s unique properties allow life to exist on Earth.

KEY CONCEPT Water’s unique properties allow life to exist on Earth. _. O. H. H. +. +. Life depends on hydrogen bonds in water. Water is a polar molecule. Polar molecules have slightly charged regions (+, -). Nonpolar molecules do not have charged regions .

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KEY CONCEPT Water’s unique properties allow life to exist on Earth.

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  1. KEY CONCEPTWater’s unique properties allow life to exist on Earth.

  2. _ O H H + + Life depends on hydrogen bonds in water. • Water is a polar molecule. • Polar molecules have slightly charged regions (+, -). • Nonpolar molecules do not have charged regions. • Hydrogen bonds form between slightly positive hydrogen atoms and slightly negative atoms.

  3. Hydrogen bonds are responsible for three important properties of water. • high specific heat – amount of heat needed to raise temperature • Cohesion- Water’s ability to stick to itself • Adhesion- Water’s ability to stick to other things

  4. solution Many compounds dissolve in water. • A solution is formed when one substance dissolves in another. • A solution is a homogeneous mixture. • Solvents dissolve other substances. • Solutes dissolve in a solvent.

  5. “Like dissolves like.” • Polar solvents dissolve polar solutes. • Nonpolar solvents dissolve nonpolar solutes. • Polar substances and nonpolar substances generally remain separate. • Example: Oil and Water

  6. stomach acid pH between 1 and 3 more acidic Some compounds form acids or bases. • An acid releases a hydrogen ion when it dissolves in water. • high H+ concentration • pH less than 7

  7. bile pH between 8 and 9 more basic • A base removes hydrogen ions from a solution. • low H+ concentration • pH greater than 7

  8. pure water pH 7 • A neutral solution has a pH of 7.

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