3.1+Chemical+elements+and+wate

Learning Goals (2 hours)

 * State that the most frequently occurring chemical elements in living things are carbon, hydrogen, oxygen and nitrogen.
 * State that a variety of other elements are needed by living organisms, including sulfur, calcium, phosphorus,iron and sodium.
 * State one role in living organisms each for sulfur, calcium, phosphorus, iron, and sodium.
 * Draw and label a diagram showing the structure of water molecules to show their polarity and hydrogenbond formation.
 * Outline the thermal, cohesive and solvent properties of water.
 * Explain the relationship between the properties of water and its uses in living organisms as a coolant, medium for metabolic reactions and transport medium.