WATER: The Medium Of Life at University Of The Western Cape | Flashcards & Summaries

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Human body consists of 
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70% water
15% lipids
12% proteins
0.5% Carbohydrates 
2.5% inorganic ions
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Living organisms are ___% of water
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70-90
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Metabolic activities required at least__ water
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65% water
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State 6 unusual properties of water?
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1. Higher boiling point
2. Higher melting point
3. Higher heat of vaporization: amount of heat required to turn a liquid into gas.
4. Higher surface tension: 
5. Higher density in liquid but not solid
6. Higher intermolecular forces.
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The structure of a water molecule?
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- bent structure, partially negative and partially positive ( polar)
-non tetrahedral bond angles.
- has H donor and H acceptor 
- potential to form 4 H bonds per water molecule
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Ionic compounds
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Compounds composed of ions held together by electrostatic forces called Ionic bonds
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Nonionic  polar compounds
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Compounds composed of atoms held together by covalent bonds.

Covalent bonds are formed by sharing a pair of electrons between two atoms 

Atoms have different electronegativity therefore unequal sharing of bonding electron pair
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Non polar compounds
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Compounds in which atoms share electrons equally eg methane

Atoms have a similar electronegativity
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Amphiphilic compounds
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Molecules that contains both strongly polar and strongly non polar groups eg fatty acids
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Solvent properties of water
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1. Excellent solvent for Ionic substances because of its highly polar nature.
2. Water forms H bonds with polar solutes.
3. Water reacts with non polar/ hydrophobic solutes
Water has a high dielectric constant
Solutes influence the biophysical properties of water
Water reacts with amphiphilic molecules
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Dielectric constant
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Measure ethe ability of a substance to store electrical energy

Water= 78.5
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Osmotic pressure of a solution
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The pressure required to prevent inward flow of water across a semi permeable membrane
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Beispielhafte Karteikarten für deinen WATER: The medium of life Kurs an der University of the Western Cape - von Kommilitonen auf StudySmarter erstellt!

Q:
Human body consists of 
A:
70% water
15% lipids
12% proteins
0.5% Carbohydrates 
2.5% inorganic ions
Q:
Living organisms are ___% of water
A:
70-90
Q:
Metabolic activities required at least__ water
A:
65% water
Q:
State 6 unusual properties of water?
A:
1. Higher boiling point
2. Higher melting point
3. Higher heat of vaporization: amount of heat required to turn a liquid into gas.
4. Higher surface tension: 
5. Higher density in liquid but not solid
6. Higher intermolecular forces.
Q:
The structure of a water molecule?
A:
- bent structure, partially negative and partially positive ( polar)
-non tetrahedral bond angles.
- has H donor and H acceptor 
- potential to form 4 H bonds per water molecule
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Q:
Ionic compounds
A:
Compounds composed of ions held together by electrostatic forces called Ionic bonds
Q:
Nonionic  polar compounds
A:
Compounds composed of atoms held together by covalent bonds.

Covalent bonds are formed by sharing a pair of electrons between two atoms 

Atoms have different electronegativity therefore unequal sharing of bonding electron pair
Q:
Non polar compounds
A:
Compounds in which atoms share electrons equally eg methane

Atoms have a similar electronegativity
Q:
Amphiphilic compounds
A:
Molecules that contains both strongly polar and strongly non polar groups eg fatty acids
Q:
Solvent properties of water
A:
1. Excellent solvent for Ionic substances because of its highly polar nature.
2. Water forms H bonds with polar solutes.
3. Water reacts with non polar/ hydrophobic solutes
Water has a high dielectric constant
Solutes influence the biophysical properties of water
Water reacts with amphiphilic molecules
Q:
Dielectric constant
A:
Measure ethe ability of a substance to store electrical energy

Water= 78.5
Q:
Osmotic pressure of a solution
A:
The pressure required to prevent inward flow of water across a semi permeable membrane
WATER: The medium of life

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