Dihydrogen Monoxide

Water is essential to all living things and it is imperative for us to have a true understanding of this substance. In class, we went through different problems relating to water and explained why water is so simple yet is so vital for life and interesting.

Interesting facts
- Water covers 70% of Earth's surface
- Only 3% of water on Earth's surface is freshwater

Properties of Water:
-Cohesive behavior
- Expansion as freezing
- Versatility as solvent
- Moderate temperature

Water Cycle:
-Evaporation: Liquid water changes into water vapor
-Sublimation: Snow or ice turning directly into water vapor
- Transpiration: Liquid given off by plants evaporating
- Condensation: Water vapor turning into liquid water
- Precipitation: Water in clouds drop to Earth's surface


















Cohesion/ Adhesion

- Water molecules forms hydrogen bonds with other water molecules / surface

Expansion as freezing

- Water = bent structure (120 degrees)
- When frozen = forms crystalline structure (more space) = expansion

Moderate Temperature

- Water takes 30 times more energy to heat than gold
- Able to break and recreate hydrogen bonds quickly
- Ability to insulate (Ice above water = keep water warm)

Solvent

- Molecules with different polarities
- Water molecules comes
- Hydrogen bonds surround the molecule
- Forms hydration cell



How plants transfer water form roots to leaves?
- Water goes through Xylem
- Uses both adhesion and cohesion
- Adhesion = water sticking onto the xylems
- Cohesion = water sticking to water itself
Video:
http://www.phschool.com/science/biology_place/labbench/lab9/images/xylem.gif