Properties of Water - NC BIOLOGYswampteacher.weebly.com/.../properties_of_water.pdf · PROPERTIES OF WATER •Much of our planet is covered in water •Water is necessary for life
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PROPERTIES OF WATER
PROPERTIES OF WATER
• Much of our planet is covered in water
• Water is necessary for life to exist
• Water has many properties that make life possible
• If life exists on other planets, there most likely is water present
POLARITY-THE CHARGE DIFFERENCE CAUSES H2O MOLECULES TO BE ATTRACTED TO EACH OTHER AND POLAR MOLECULES
-
The oxygen atom has a stronger attraction for electrons
+
+
HYDROGEN BONDS
• Because of H2O partial charges, they can attract each other and create hydrogen bonds
• Not as strong as covalent or ionic bonds
• H2O ability to create multiple hydrogen bonds gives it many special properties
COHESION
Attraction between molecules of the same substance
ADHESION
•Attraction molecules of different substances
SOLUTION VS. MIXTURE
Solution
Mixture of two or more substances in which the molecules are evenly distributed
• Solute dissolved in a Solvent
• Salt water
• Sugar & Water
• Soda
Mixtures
Material composed of two or more elements or compounds that are physically mixed but not chemically combined
• Salt & pepper,
• Earth’s atmosphere
SOLUTIONS
Solute
Substance that is dissolved
•Salt
Solvent
Substance that does the dissolving
•Water
SUSPENSIONS
Mixture of water and non-dissolved materials•Cells in growth media•Plasma in blood
ACIDS VS BASES
Acids
• Any compound that forms H+
(hydrogen) ions in solution
• pH lower that 6
• Lemon juice
• Stomach acid
• Vinegar
Bases
• A compound that produces OH-
(hydroxide) ions in solution
• pH higher than 8
• Ammonia
• Bleach
• Oven cleaner
PH SCALE
• Indicates the concentration of hydrogen ions in a solution
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