lecture 10 cont water

Question 1

Properties of water

Answer 1

• Water is a polar molecule
  
  • Water has properties that are critical to all life
  • Has a negative and a positive zone
    Polarity - weak (transient)

Question 2

why is water polarity weak

Answer 2

• Polarity - weak (transient)
  ○ Hydrogen bonds form btwen water molecules
  Individually weak bond, resulting in key characteristics of water

Question 3

Properties resulting from polarity and H bonds?

Answer 3

1. Cohesion - holding together of like substances (water molecules)
   
   2. Adhesion - holding together of unlike substances (water molecules with other things)
   3. High specific heat - amount of energy (heat) needed to raise 1g of water by 1 degree C (absorbs a lot of heat- cools surroundings) (this is bc of polarity)
   4. High heat of vaporization - quantity of heat needed to convert 1g liquid to gas

Question 4

blue vs green water?

Answer 4

• Blue water - water that pools
  
  • Green water - water in ecosystems
    More green water than blue - more flowing through our ecological system

Question 5

main imput of water flow in terrestrial system

Answer 5

Main input is precip

Question 6

desribe interception

Answer 6

• Interception - foggy environments - humidity in air is high enough for the water to condense onto surface - can be harvested in aired environments
  Substancial (10-50%) in closed canopy forests

Question 7

describe Throughfall + stem floe

Answer 7

Throughfall and stemflow- interception of water by plants impacts the flow - stemflow = canopy draws the water down the stem - catching water and directing it so its more available to the plant

Question 8

how does stem flow enhance water flow

Answer 8

Stemflow - enhances flow by creating little spaces + stem adheres water = water goes down toward root system + help make it go deeper into the root system and less available to competition