Properties of Water

1
Properties of Water
Covalent bonding - sharing of electrons between
non-metals
Polar covalent bond unequal sharing of
electrons
2
Properties of Water
Covalent bonding vs. Hydrogen bonding
Hydrogen Bond
Covalent Bond
3
Roles of Water
Weathering erosion
4
Roles of Water
Habitat
5
Properties of Water
In order to raise the temperature of water, the
average molecular speed has to increase. It
takes much more energy to raise the temperature
of water compared to other solvents because
hydrogen bonds hold the water molecules
together! Water has a high heat capacity. The
specific heat is the amount of heat per unit mass
required to raise the temperature by one degree
Celsius.
High Heat Capacity
6
Roles of Water
Coolant
7
Roles of Water
Stabilizes coastal temperatures
8
Roles of Water
Water is the universal solvent
Solute substance dissolved in a solvent to form
a solution Solvent fluid that dissolves
solutes Eg. Dissolve nutrients, carries waste,
drinks, cleaning products
9
Metabolism Making Biological Molecules
10
Add water to metabolize large organic polymers
11
Roles of Water
Dissociation of an ionic lattice
12
Roles of Water
Hydration of a soluble molecular compound Eg.
sugar
13
Properties of Water
Water is Cohesive
cohesion water attracted to other water

molecules because of polar properties
14
Properties of Water
Water is Adhesive
adhesion water attracted to other
materials
15
Properties of Water
Water Has a High Surface Tension
surface tension water is pulled
together creating
the smallest surface area possible liquids
with low surface tension tend to spread out

16
Properties of Water
Capillary Action
Because water has both adhesive and cohesive
properties, capillary action is possible.

17
Properties of Water
Density
Water is less dense as a solid! This is because
the hydrogen bonds are stable in ice each
molecule of water is bound to four of its
neighbors.
Solid water molecules are bonded together
space between fixed Liquid water molecules are
constantly bonding and rebonding space is
always changing
18
Properties of Water
Frozen water expands and is less dense
19
Properties of Water
So, can you name all of the properties of water?
Adhesion Cohesion Capillary action High surface
tension High heat capacity Less dense as a solid
than a liquid Boiling Point Melting
Point Density Viscosity