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Biochemistry 2-2

Biochemistry 2-2. Properties of water. Polarity- Water is polar because of the uneven distribution of electrons between the O and the H. Properties of water.

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Biochemistry 2-2

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  1. Biochemistry 2-2

  2. Properties of water Polarity- Water is polar because of the uneven distribution of electrons between the O and the H.

  3. Properties of water Hydrogen bond- Water molecules bond to other water molecules. A substance that is attracted (can bond) to itself is known as cohesion.

  4. Properties of water Adhesion- attraction of molecules of different substances.

  5. assignment • Make a water molecule!

  6. The *Chemistry of *water Key words: Polarity/Dipole, Cohesive, Adhesion, How does Water’s solubility break down a compound such as salt? *Water is life…

  7. Water Olympics

  8. Mixture- material composed of two or more elements or compounds that are physically mixed but not chemically combined.

  9. Solution- liquid mixture Solute-the substance that is dissolved. Solvent –the substance into which the solute dissolves.

  10. Acids, bases and ph • Acids- A solution that can donate a hydrogen ion- a proton to another substance. Have a higher H+ concentration. • Generally written in an equation as H(x) • Ex. HCl, HF, HBr • Acids are substances that have a pH of less than 7.0

  11. Acid Properties • Taste- sour when dissolved in water- lemon, lime, grapefruit • Touch- acids produce a burning or stinging sensation.

  12. Acid Properties • Reactivity- react aggressively with most metals. • Electrical Conductivity- can conduct a current depending on the strength of the acid. • Litmus paper- turns paper red

  13. Base properties • A solution that can accept a hydrogen ion- a proton- from another substance. • Abase is any solution that has a pH greater than 7.0

  14. Base properties • Taste- bitter • Tough- slimy or soapy feeling.

  15. Base Properties • Reactivity- react violently with acids and can cause burning. • Electrical Conductivity- in solutions such as water will conduct electricity. • Litmus paper- turns paper blue

  16. Ph scale = potential of hydrogen • Identifies a substance as acidic or basic • 0-6.9 = acidic • 0-4 strong acid • 4.01-6.9 weak acid • 7.01-14= basic • 7.01-10= weak base • 10.01-14= strong base

  17. Buffer • Weak acids or bases that balance strong acids/bases in the body to help keep the body in homeostasis.

  18. assignment

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