LECT 3 - Water and PH

• water covers how much of the surface?

  70%
• what is the major component of living cells?

  Water
• women have less water than men 


  true
• what is hydrogen bond made of?

  2 H2O molecules, that are joined by a hydrogen
• water molecules form 


  4 hydrogen bonds
• how many hydrogen bonds does liquid water make?

  3.4
• water is a ---- heat capacity

  high
• what does it mean to have a high heat capacity? 


  there's a certain heat capacity that is needed in order for the temp to increase
• is water resistant or susceptible to temp change?

  Water resistant
• what does water transport?

  nutrients all through the body and wastes out of the body
• what is a solvent?

  it is used to dissolve or dilute other substances
• what is hydrophilic ?


  they love water, so they can dissolve in water
• is water solvent or solute 


  solvent
• what is solute ?


  solute dissolves into solvents (salt is solute, water is solvent)
• when is water a good solvent?

  charged and polar substances
• what polar molecules make water a good solvent

  amino acids, peptides, carbohydrates, nucleic acids
• when is a water a poor solvent? 


  non polar substances (hydrophilic)
• what is the hydrophobic effect?

  when water squeezes out the non polar substances to maximize its own H bonding & non-polar substances aggregate and exclude water molecules
• Why is PH vital to all cells?

  it affects the structures of functional groups
• functions follow 


  structure