Zusammenfassung der Ressource
Water
- Thermal properties:
- High specific heat capacity; Hydrogen
bonds
- High boiling point
- 100 Degrees
- Excellent coolant e.g sweating,
panting
- Aquatic life can still live under ice; water is densest at 4 degrees-
then shrinks
- Requires lots of energy to seperate water + hydrogen
molecules apart
- Cohesive structure
- The sticking together of particles of same
substance.
- Cohesive properties:
- Water molecules stick together --> Hydrogen bonds
- Water: dragged up via Xylem vessels to top leaves of trees
- Surface tension
- Living things can live on surface of ponds &
streams e.g. pondskater
- Solvent properties:
- Universal solvent
- Can dissolve many substances esp POLAR ones.
- POLAR: Substances that have + & - charges in
molecular structure.
- Only HYDROPHOBIC substances DON'T dissolve in water
- Metabolic reactions happen in AQUEOUS solutions
- Many substances can be transported around if
dissolved in SAP/BLOOD
- Transports materials e.g. blood,
sap
- Supports plant structure
- Used in photoshynthesis
- 6CO2 + 6H2O ------> C6H1206 + 6O2
- Carbon Dioxide + Water -------> Glucose + Oxygen
- Hydrogen (slightly +) attracted to Oxygen (slightly
-) ---> Covalent bonding between them
- Water is stable structure; numerous
HYDROGEN bonds
- Water structure is DIPOLAR
- Electrically neutral molecule carrying + & - charge