Properties of Water
Why are water molecules like magnets?
+ and - are attracted to each other
What is an example of cohesion in nature?
-surface film on water that allows insects to walk on water -leaf floating on water
What is an example of adhesion in nature?
-water being drawn upward against Earth's gravity from roots to leaves -water sticking to plants and spider webs
Water freezes at what temperature?
0 degrees Celsius (32 degrees Fahrenheit)
Properties of Water
1. Cohesion 2. Adhesion 3. Expansion on Freezing 4. Universal Solvent 5. Surface Tension 6. Capillary Action
What temperature does water boil at?
100 degrees Celsius (212 degrees Fahrenheit)
What pH level is pure water?
7
What percentage of the Earth's surface is covered in water?
70%
Why is water known as the "Universal Solvent"?
Because of water's polarity it is able to dissolve a wide variety of substances, more substances than any liquid. Water carries nutrients and gases vital to life in our blood and body fluids, and it distributes nutrients and gases throughout the oceans.
What is the chemical formula for water?
H2O
What is capillary action?
It is the tendency of a liquid to rise in narrow tubes or to be drawn into small openings. It is the result of cohesion and adhesion.
What is the biggest ocean on Earth?
Pacific Ocean
What is Earth's nickname?
The Water Planet
Describe the water molecule.
The negative oxygen end of one water molecule is attracted to the positive hydrogen end of another water molecule to form a hydrogen bond.
True or False? Pure water is tasteless.
True
What form is water most dense?
Water is MOST dense in its solid form! This makes water so unique. It allows ice to float and insulate oceans and lakes.
How long can a human survive without water?
a few days
Which property of water allows water to "climb" up stems/trees?
adhesion and capillary action
What kind of element is water?
compound element
What two elements make up water?
hydrogen and oxygen
What happens to water as it cools?
it expands
What is cohesion?
the ability of water molecules to stick to each other
What is adhesion?
the ability of water molecules to stick to other substances
What is surface tension?
the combination of water's strong cohesive and adhesive qualities gives water a high degree of surface tension, so it is hard to break the surface of water compared to other liquids
What is another name for a tidal wave?
tsunami
Does sound travel faster through water or air?
water