date: october 16, 2015 aim #16: what are some of the unique properties of water? hw: 1)worksheet-...
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Date: October 16, 2015Aim #16: What are some of the unique properties of water?
HW:1)Worksheet- Properties of Water DUE
TUESDAY2)Guided Reading 2-2 DUE THURSDAY3)Quiz (Inorganic Chemistry)- Wednesday
10/21 & Thursday 10/22 (day of double period)
Do Now: Warm-Up Notebook
Date Title of Activity Page #10/16 Chemical Bonding
31
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Aim #16: What are some of the unique properties of water?
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Water is a Polar MoleculeWhat does that mean?
A molecule in which opposite ends have opposite electrical charges
This is due the unequal sharing of electrons betweenthe hydrogen and oxygen atoms
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Why is there unequal sharing of electrons in water molecules?
The nucleus of Oxygen has 8 protons which pullsthe electrons farther from the hydrogen nucleuswhich only has 1 proton
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Is H2 a polar molecule?
No, because each of the hydrogen electrons are being pulled from an equal amount of protons.
H2 is an example of a Non-Polar Molecule
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Water molecules attract each other in a specific way due to this
unequal sharing
The slightly negative oxygen atom of one moleculeattracts the slightly positive hydrogen atom of adjacent water molecules
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This attraction between water molecules is called Hydrogen
Bonding
Hydrogen Bonding is responsible for water’sunique properties
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Unique Property #1
The molecules of water in ice are less densely packed than those of liquid water
Therefore, ice floats in water
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Unique Property #2
Cohesion- the tendency ofmolecules of the same kindto stick to one another
Adhesion- the attraction between unlike molecules
Trees depend on theseproperties of water to helptransport water from theirroots to their leaves
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This is known as Transpiration
Water is able to move against the force ofgravity
Water from the leavesevaporate and water is Pulled through the vesselsIn the tree from the roots
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What is Surface Tension?
Cohesion pulls the molecules at the surface tightlytogether and a filmlike boundary is formed
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Unique Property #3Why does water take longer to heat up in the summer and longer to cool in the winter?
H bonds make water more resistant to temperaturechange
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Unique Property #4
Water has a great abilityto dissolve other substances
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What is a solution?
Solution- is a uniform mixture of two or more substances
Solvent- the substance that dissolvesthe other substance
Solute- the substance that is dissolved
**When water is the solvent, the result is called anAqueous solution