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Question of the DayHow are ionic and covalent bonds
different?
9-23
Explain the formation of compounds (ionic + covalent) and their resulting properties using bonding theories.
Objective9-23
Question of the Day9-24
Get out your POE from yesterday (lab paper). Were there any substances that surprised you (there should probably be at least one)?
Explain the formation of compounds (ionic + covalent) and their resulting properties using bonding theories.
Objective9-24
ExplainWater # 1
Water # 2
Salt water
Sugar water
Vegetable Oil
Names __________________
________________________
Come up with an explanation for why the two water samples may have been so different.
When ionic compounds are dissolved in water they break apart into ions what two ions is the salt break apart into (include charges)?
We will come back to these two later leave them blank for now.
Page 34 #s 1-8
My.hrw.comPage 34 #s 1-8
Allan Smith
15
Kamil Kolkowski
9
Natalie Gilbert
Robert Riffel
Justin Smigley
10
Ali Smith
11
Matthew Rivera
14
Alexandria Clowney
12
Vincent Farber
6
Ryan Freeman
13
Victoria Jurjevic
8
James Harkness
8
Kyle Watson
7
Mariangely Onativia
2
Thomas Sinner
Nicole Deluca
Kenneth Charlot
3
Evan McSwegan
4
Christopher Cayo
5
Elizabeth Buzzard
5
1st period is all the way done with 1-8 but second period finished it for hwk and needs to go over it.
Covalent bonds can be __________ or ___________.
Question of the Day9-27
Compare and contrast different bond types that result in the formation of molecules and compounds.
Objective9-27
Nonpolar Covalent bond - bonding electrons are shared equally by bonded atoms
Polar Covalent bond - bonding electrons are shared unequally by bonded atoms
Covalent bonds can be polar or nonpolar
Ionic bonds
Polar Covalent
bonds
Nonpolar
Covalent bonds
Transfer elecs.
Share elecs.
What is the difference between polar and nonpolar covalent bonds?polar
Moving in the ionic direction
Atoms attract shared electrons unequally
nonpolar
Purely covalent
Atoms attract shared electrons equally
The Fight for Electrons – bonding as a tug-of-war
H H
HBr
TieCovalent
Polar Covalent
NaCl Ionic
The Fight for Electrons – bonding as a tug-of-war
Bonds are purely covalent when …
Quick TalkNeutron
Ionic bond
Mass number
Octet rule
Biosphere
Valence electrons
Atomic number
Covalent bond
Proton
Biotic factor
Penn State
Water contains __________ bonds.
Question of the Day9-28
Describe how the unique properties of water support life on Earth.
Objective9-28
READ pages 39-44 AND complete #s 1-8 of the section
review on page 44
• Polarity –– When a molecule has an uneven distribution of charge
(unequal electron sharing
• Water - – Oxygen doesn’t share the electrons equally with
hydrogen– So if the oxygen pulls the electrons closer, the oxygen
then becomes partially negative, and the hydrogen will become partially positive.
– Draw a water molecule:
Hydrogen Bonding
OH
H(-)
(+)
OH
H(-)
(+)
O H
H
(-) (+)
(+)(+) (+)
Bonds• Hydrogen Bonds –– A hydrogen bond is the force of attraction
between a hydrogen molecule with a partial positive charge and another atom or molecule with a partial or full negative charge.
– Weak attraction between the partially negative oxygen and partially positive hydrogen
– This is what gives water some VERY IMPORTANT qualities
Important Qualities of Water– Surface Tension:
• Created by hydrogen bonds – the water is able to resists force of objects -- water “sticks” to itself
– Which is more dense, water or metal?• Metal
– Floating paper clip?!?! Why???• Metal, but paperclip floats b/c water is weakly
bonded and those bonds are not breaking.
Molecule – group of atoms united by covalent bonds (molecules = molecular substance)
FORMULAS
Chemical- How many atoms of each element
Structural - How atoms are bonded together