Water Properties PDF

Water 2 Properties of Water https://www.youtubeeducati on.com/watch?v=3jwAGWky 98c  3 Water is made up of two hydrogen atoms covalently bonded to an oxygen atom (molecular formula = H2O) Slight positive charge on the hydrogen side, this...

Water 2 Properties of Water https://www.youtubeeducati on.com/watch?v=3jwAGWky 98c  3 Water is made up of two hydrogen atoms covalently bonded to an oxygen atom (molecular formula = H2O) Slight positive charge on the hydrogen side, this Nonpolar molecules, makes water a like oil, are POLAR molecule. hydrophobic.  4 Polarity Water is described as being polar because it has a slight charge difference across the different poles of the molecule The oxygen atom is slightly negative (δ–) while the hydrogen atoms are slightly positive (δ+)  5 Explain the polarity of water Oxygen has a negative charge and attracts the positive hydrogens in strong covalent bonds. The area around the oxygen atom is slightly negative and the area around the hydrogen atom is slightly positive. This creates an attraction between the two.  6 “ Intermolecular bonding Water has a high specific heat capacity The temperature of liquid water rises and falls more slowly than that of most other liquids.. Fun Fact: A Calorie is amount of heat energy required to raise temperature of one gram of water 1o C. In short, it takes a long time for water to heat up and a long time for it to cool.  This Is Why Water Striders Make Terrible Lifeguards https://www.youtubeeducation.com/watch?v=E2unnSK7WTE  9 High specific heat capacity - results in stable temp for water  10 High specific Heat - water is excellent coolant Water has a high heat of vaporization. Hydrogen bonds between water molecules require a large amount of heat to break. Water does not evaporate easily! Water is a Solvent - it dissolves a great number of solutes and can change their properties Dissociation - atoms break off from molecules and form ions. Water’s Cohesive and Adhesive Basically, it sticks to itself and it sticks to other things due to hydrogen bonds. Hydrogen bonds create surface tension.  14 Cohesion and Adhesion = sticky!!  Cohesion (between water 15 molecules) and Adhesion (between water and other charged molecules) Transpiration - water evaporates from the leaves through the stomata  16 Why are cohesion and adhesion important to biology? (biologically significant) Water has high surface tension so insects can “walk on water” without sinking.  17 Why are cohesion and adhesion important to biology? (biologically significant) Allows water to move upwards in plant capillaries to get water to all the leaves.  18 Properties of Water https://www.youtubeeducation.com/watch?v=VzJliO8URVM  19 “ Hydrophobic vs Hydrophilic 20 “ 21