Embed Size (px)
Citation preview
Water: A Limited Resource
Chapter 14
The Importance of Water
Objectives:
1. Describe how the structure of water molecules accounts for the many important characteristics of water.
2. Describe the distribution of water throughout the Earth
The Importance of Water
Water:
• shapes continents
• moderates our climate
• is essential for all living organisms
The Importance of Water
Our Supply of Fresh Water
The Importance of Water
Properties of Water
Composition and polarity
Hydrogen bonding properties
The Importance of Water
Unique properties:
•Water has a high melting point (0oC) and a high boiling point (100oC)
The Importance of Water
Unique properties:
•Water has a high specific heat•It can absorb or release large amounts of energy without its temperature changing significantly
The Importance of Water
Unique Properties:
•Water has high heat of vaporization
The Importance of Water
Unique properties:
•Water is the “universal solvent”
Chemical composition of seawater
The Importance of Water
Unique Properties:
•Liquid water becomes less dense as it warms•Ice is less dense than liquid water
The Importance of Water
The Hydrologic Cycle
The Importance of Water
Types of water:
• surface water
• runoff
• drainage basin (watershed)
• groundwater
• aquifers
The Importance of Water
Aquifers
