Lesson 4 Flashcards
Structure and Properties of Water:
- It has high boiling point and exists as a liquid at room temperature.
- It has high specific heat, which requires large amounts of heat before it vaporizes.
- It is the only substance that contracts when cooled because of its more open structure in the solid form.
- It has high heat of vaporization
- It has high surface tension
How is heat energy distributed in the water molecules?
The additional heat energy will be shared with other water molecules and collide with others as the heat energy from a heat source is distributed.
How does the bond between the water molecules can be renewed?
By lowering the temperature.
The density of ice is ____ than liquid water, hence, it floats on water.
Less
What happens to the water molecules when it is cooled?
The water molecules contract.
Why does the ice float in water?
Because ice has an open structure due to repulsion of negative-charged oxygen atoms.
Water has ____________ (540 cal./g amount of heat energy to convert 1 g of liquid water at 100 degrees to steam at 100 degrees = 40.71 kJ/mol = 2260 kJ/kg water.
Latent heat of vaporization
A water property that helps to cool down the body of living organisms.
Evaporation cooling
Examples of evaporation cooling:
- Humans heat and vaporize sweat and process of vaporizing.
- Vaporize plant water is called transpiration.
How does the body of the living organism like humans and plants cool down?
For humans, body heat is used to vaporize sweat, and for plants, heat is also used to convert liquid water to water vapor that goes into the atmosphere.
Other than mercury, water has the greatest _______ of any liquid.
Surface tension
The ________ causes the molecules on the surface to contract and resist being stretched or broken.
Inward net force
How does the barrier between the atmosphere and water form?
The water molecules come in contact with each other.
Why does a small object float above the surface of the fluid?
Due to the surface tension.
