Water Flashcards
(48 cards)
What percent of an organism is made up of water?
70%
What kind of molecule is H2O?
Water is a polar molecule
How many properties of H20 are there?
5
What are the properties of H2O?
- Water is cohesive and adhesive
- Water has a high specific heat
- Water has a high heat of evaporation
- Ice floats
- Water is a great solvent
Cohesion
Water molecules stick to each other
“like sticks to like”
Adhesion
Water molecules will stick (adhere) to any charged or partially charged molecule
What causes surface tension?
Cohesion and adhesion
What causes capillarity?
Cohesion and adhesion
Capillarity
The phenomenon of H20 moving against gravity through small tubes (sucking up through the tube)
What is “specific heat”?
A measure of how much energy a substance can absorb without changing its temperature
Temperature
A measure of molecular vibration
What is the temperature when molecules are vibrating fast?
High temperatures
What is the temperature when molecules are vibrating slow?
Low temperatures
How many H bonds does an H20 molecule have?
Maximum of 4 H bonds
How many H bonds does ice have?
4 bonds
How many H bonds does water have?
3 bonds
How many H bonds does hot water have?
2 bonds
How many H bonds does boiling water have?
1 bond
How many H bonds does steam have?
0 bonds
What prevents the vibrations of water molecules?
H bonds. That’s why ice has 4 H bonds, the vibration is low
How does water help regulate temperatures?
Water is a GREAT heat sink. It will absorb heat and stabilize the temperature throughout the day. (why Bayfield is always chilly, the lake is sucking up the heat)
In what unit is energy measured?
Calories - Physics calories reference WATER
calories
Physics calories 1000c=1C
Calories
Nutrition calories 1C=1000c
