PROPERTIES OF WATER
DON’T WRITE ON THIS WORKSHEET – USE IT TO HELP YOU MAKE NOTES IN
YOUR CLASS WORKBOOK!
LIST five properties of water that are essential to life
1. …………………………………………
2. …………………………………………
3. …………………………………………
4. …………………………………………
5. ………………………………………….
POLARITY OF WATER: DRAW A WATER MOLECULE!
A water molecule is a………………………..molecule, with opposite ends of the
molecule with………………………….
HYDROGEN BONDS
Hydrogen bonds hold water molecules together.
6. Each water molecule can form a maximum of ………… hydrogen bonds
7. The hydrogen bonds joining water molecules are……………………, about 1/20 th
as strong as ………………bonds
8. They form, break and reform with………………………..
ORGANISMS DEPEND ON COHESIVE AND ADHESIVE PROPERTIES OF WATER
9. Cohesion is responsible for ……………………………… of the water column in plants.
10. ……………………………..among water molecules plays a key role in the transport of
water against gravity in plants.
11. ……………………., attraction of one substance for another (unlike) substance, also
contributes to transport of water against gravity in plants, since water adheres to
the wall of the vessels.
12. ………………………………, a measure of the force necessary to break or stretch the
surface of a liquid, is related to cohesion.
13. Water has a ……………….surface tension than most other liquids because hydrogen
bonds between surface water molecules resist stretching or breaking of the water
surface.
Water behaves as if covered by an invisible film.
Some animals can stand, walk or run on water without breaking the surface.
WATER MODERATES TEMPERATURES ON EARTH
Evaporative cooling
As liquid evaporates, the surface of the liquid that remains behind is cooled.
This is responsible for:
A………………………………………………………..
B………………………………………………………..
C………………………………………………………..
DENSITY OF WATER
Water molecules are at their maximum density at 40C.
This is important because…
LIST 5 extraordinary properties of water that are a consequence of hydrogen bonds
1. ………………..
2. ……………….
3. …………………
4. …………………
5. …………………
WATER AS THE SOLVENT FOR LIFE
….% of the planet and ……% of the human body consist of water.
Water is a ………………………..
Water’s …………………gives it
and…………………….molecules.
the
ability
The……………………is what is dissolved in water.
to
dissolve………………………….
HOMEWORK
Read each statement below and explain (in 2-3 sentences per statement) how the
properties of water are related to the phenomena that are described. More than one
property may be used to explain a given phenomena.
1. During the winter months, air temperatures in the northern United States can remain
below zero deg. C for months; however the fish and other animals living in the lakes
survive.
2. Many substances, for example salt, dissolve in water very quickly.
3. When you pour water into a 25 mL graduated cylinder, a meniscus forms at the top of
the water column.
4. Sweating and the evaporation of sweat from the body surface help reduce a human's
body temperature.
5. A bottle contains oil and water. You shake the bottle vigorously and put it on the
table. Over time, the oil and water separate.
6. If you touch the edge of a paper towel with water, the water will move up into (or be
absorbed by) the towel.
Here's a reminder of some of the properties of water:
Life as we know it could not exist without water. All the chemical reactions of life occur
in aqueous solution. Water molecules are polar and are capable of forming hydrogen
bonds with other polar or charged molecules. As a result, water has the following
properties:
A. H2O molecules are cohesive; they form hydrogen bonds with each other.
B. H2O molecules are adhesive; they form hydrogen bonds with polar surfaces.
C. Water is a liquid at normal physiological (or body) temperatures.
D. Water has a high specific heat.
E. Water has a high heat of vaporization.
F. Water’s greatest density occurs at 4°C.