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
Aim #16: What are some of the unique properties of water?
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
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
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
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
This attraction between water molecules is called Hydrogen
Bonding
Hydrogen Bonding is responsible for water’sunique properties
Unique Property #1
The molecules of water in ice are less densely packed than those of liquid water
Therefore, ice floats in water
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
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
What is Surface Tension?
Cohesion pulls the molecules at the surface tightlytogether and a filmlike boundary is formed
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
Unique Property #4
Water has a great abilityto dissolve other substances
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