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2.2 Properties of Water

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Jeanette Morales

on 9 September 2014

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Transcript of 2.2 Properties of Water

2.2 Properties of Water
Unique Characteristics of Water
liquids at room temperature
expands as it freezes
unlike most things on Earth
because ice is (0.9167 g/cm3) less dense than water...this allows it to float on top of water (1.0g/mL)

Mixtures are when you have two or more substances that are physically combined but not chemically/
pH scale
water formula
water is polar
it is a polar covalent molecule, it has a slight positive and slight negative charge on opposite ends.

polarity is created in a
molecule by unequal sharing
of electrons
hydrogen bonding
Cohesion is an attraction between molecules of the same substance.
Water is very cohesive because of hydrogen bonding.

let's try it...
how many molecules of water droplets can you place on a penny before cohesion forces are at their limit and split over?
A solution is a mixture of two or more substances in which the substances are evenly distributed.
Cohesion creates surface tension
The weight of the paper clip isn’t
enough to break the weak
hydrogen bonds between the water molecules

same for water bugs

Adhesion is an attraction between
molecules of different substances.

Adhesion is an attraction between
molecules of different substances.
Water also sticks to, or adheres, to other charged surfaces well.
capillary actions
This is why a meniscus
forms when you are
measuring liquid.
A suspension is a mixture of water and a non-dissolved substance
A solvent is a substance in which a solute is dissolved to form a solution.
WATER is the UNIVERSAL SOLVENT because of its polarity- it will dissolved any polar or ionic compound. ***
A solute is a substance that is dissolved in a solvent to make a solution.
Blood is mostly plasma (water with
dissolved salts and sugars).
Plasma is a solution.
Blood has red and white blood cells
in the blood that are in suspension.

Is blood a solution or suspension?
The pOH scale represents
how many OH – ions
The pH scale represents
how many H+ and are
in a solution.
Ph scale is logarithmic- each
number increase is 10X more.
pH of 1 is 10x more acidic than
a pH of 2 and 100x more acidic
than a pH of 3.

Mixtures made with water include solutions and suspensions.
This picture shows capillary action...
what properties of water allow the water to climb up the tube?
measures concetration on H+ions in a solution
are weak acids and bases that can react with stronger acids/beases help prevent sudden pH changes
The kidneys and the lungs work together to help maintain a blood pH of 7.4 by affecting the components of the buffers in the blood.
the normal blood pH of 7.4 is outside the optimal buffering range;
therefore, the addition of protons to the blood due to strenuous exercise may be too great for the buffer alone to effectively control the pH of the blood.
When this happens, other organs must help control the amounts of CO2 and HCO3- in the blood.
The lungs remove excess CO2 from the blood (helping to raise the pH via shifts in the equilibria) and the kidneys remove excess HCO3- from the body (helping to lower the pH).
The lungs' removal of CO2 from the blood is somewhat impeded during exercise when the heart rate is very rapid
the blood is pumped through the capillaries very quickly, and so there is little time in the lungs for carbon dioxide to be exchanged for oxygen.
The ways in which these three organs help to control the blood pH through the bicarbonate buffer system
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