Properties of Water Covalent bonding - sharing of electrons between non-metals Polar covalent bond...
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Transcript of Properties of Water Covalent bonding - sharing of electrons between non-metals Polar covalent bond...
Properties of Water
Covalent bonding - sharing of electrons between non-metals
Polar covalent bond – unequal sharing of electrons
Properties of Water
Covalent bonding vs. Hydrogen bonding
Covalent Bond
Hydrogen Bond
Roles of Water
Weathering & erosion
Roles of Water
Habitat
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
Roles of Water
Coolant
Roles of Water
Stabilizes coastal temperatures
Roles of Water
Solute – substance dissolved in a solvent to form a solution
Solvent – fluid that dissolves solutes
Eg. Dissolve nutrients,
carries waste, drinks,
cleaning products
Water is the universal solvent
Metabolism: Making Biological Molecules
Add water to metabolize large organic polymers
Roles of Water
Dissociation of an ionic lattice
Roles of Water
Hydration of a soluble molecular compound
Eg. sugar
Properties of Water
cohesion = water attracted to other water molecules because of polar properties
Water is Cohesive
Properties of Water
adhesion = water attracted to other materials
Water is Adhesive
Properties of Water
surface tension = water is pulled together creating the smallest surface area possible;
liquids with low surface tensiontend to spread out
Water Has a High Surface Tension
Properties of Water
Capillary Action
Because water has both adhesive and cohesive properties, capillary action is possible.
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
Properties of Water
Frozen water expands and is less dense
Properties of Water
So, can you name all of the properties of water?
AdhesionCohesionCapillary actionHigh surface tensionHigh heat capacityLess dense as a solid than a liquidBoiling PointMelting PointDensityViscosity