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Importance of water to living things
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Biochemistry:The chemistry of life.ELEMENTS AND WATER
HYDROGEN AND
OXYGEN
CARBON, NITROGEN, PHOSPHOR
US
IRON SODIUM
SULPHUR CALCIUMPOTASSIU
MCHLORID
EHYDROGEN BOND
THERMAL
COHESIVE SOLVENT
COOLANT
MEDIUM (FOR METABOLIC REACTIONS/
TRANSPORT)
POLARITY
KEY WORDS
The Periodic Table for Biologists. The elements considered essential for life.
The most frequently occurring chemical elements in living things are carbon, hydrogen, oxygen and nitrogen.
Carbon and hydrogen form the basis of organic molecules.
NITROGEN
Nitrogen is essential in amino acids and proteins = growth and repair
SULPHUR
found in some amino acids.
PHOSPHORUS
Phosphorous in phospholipids in cell membranes.
Phosphates as active part of ATP molecules (for energy)
Part of the DNA “backbone”
Iron
Animals: In haemoglobin it binds to oxygen.
Plants: Important in photosynthesis as a component of chlorophyll and ferredoxin.
Sodium and Potassium
Nerve impulses.
Osmotic gradients. Sodium ions form the main cation in blood plasma.
Nasodium
11
HYDROGEN Valency =1 Forms 1 bond Electronegativity of Oxygen causes polarity Water is a DIPOLAR molecule
Draw and label water molecules to show their polarity and hydrogen bond formation.
Negative Pole
Positive Pole
O
H
_
+ +
Covalent Bond
Covalent Bond
H
Draw and label water molecules to show their polarity and hydrogen bond formation.
Hydrogen bonds form between water molecules.
O-
H+
H+ O-
H+
H+
O-H+ H+
O-H+
H+
O-H+H+
O-H+ H+
O-
H+
H+
Explain the properties of water
PROPERTY CAUSE IMPORTANCE
ADHESION HYDROGEN BONDS TRANSPIRATION
COHESION HYDROGEN BONDS TRANSPIRATION
SURFACE TENSION HYDROGEN BONDS HABITAT
HIGH SPECIFIC HEAT CAPACTIY
HYDROGEN BONDS STABILITY FOR HOMEOSTASIS
HIGH LATENT HEAT OF VAPORISATION
HYDROGEN BONDS EVAPORATIVE COOLING
SOLVENT POLARITY TRANSPORT OF SUBSTANCES
DENSITY OF ICE HYDROGEN BONDS ICE FLOATS PROTECTS HABITAT
Explain these images and relate them to the properties of water.
Try these questions:1. What are hydrogen bonds? (3)
2. Why does salt dissolve in water but oil does not? (2)
3. multiple choice:
Make your notes: V/S = Mindmap M/L= Table V/S= Images and colour M/L. Mus= Note how many and find a
pattern Nat= give exaples from nature Inter.Ling= teach it! Mus= sing it