Properties of Water Flashcards
1
Q
Cohesion
A
- Water molecules form hydrogen bonds with each other
- Water clings
2
Q
What is the effect of cohesion?
A
Gives water a high surface tension
3
Q
Example of cohesion
A
- A water strider walks on the surface of a pond
4
Q
Adhesion
A
- Water molecules form hydrogen bonds with other polar molecules
- Water clings
5
Q
What is the effect of adhesion?
A
- capillary action and solubility of polar compounds
6
Q
Examples of adhesion
A
- polar substances, (ex sugar), are highly soluble in water
- Capillary action causes water to move up the xylem tubes in plants
7
Q
High Specific Heat Capacity
A
- Hydrogen bonding causes water to absorb large amounts of thermal energy as its temperature increases, or loose large amounts of thermal energy as its temperature decreases
- water absorbs thermal energy
8
Q
What is the effect of high specific heat capacity?
A
Temperature moderation
9
Q
Example of high specific heat capacity
A
- It helps organisms maintain a constant body temperature
10
Q
High Specific Heat of Vaporization
A
- Hydrogen bonding causes liquid water to absorb large amounts of thermal energy and become a vapour (gas)
- water absorbs thermal energy
11
Q
What is the effect of high specific heat vaporization?
A
Evaporation and cooling
12
Q
Example of high specific heat vaporization
A
- Many organisms, including humans cool down by the evaporation of water from the surface of the body, often by sweating
13
Q
Highest Density at 4℃
A
- As water molecules cool below 0℃, they form an ice water lattice. The hydrogen bonds keeps the water molecules spread apart, reducing the density so that it is below the density of liquid water
- solid water is less dense then liquid water
14
Q
What is the effect of highest density at 4℃?
A
Ice floats on water
15
Q
Examples of highest density at 4℃
A
- fish and other aquatic organisms survive in winter because water freezes from the top down
- Snow is a good insulator. It provides protection from extreme cold for many organisms
