Polar, Non-Polar & Hydrogen Bonds -...
Transcript of Polar, Non-Polar & Hydrogen Bonds -...
Polar, Non-Polar & Hydrogen Bonds
Packet #20
Types of Chemical Bonds
Polar Bond
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Remember…
Bond Polarity is due to differences in electro-negativity
Bond polarity can predict the polarity of a bond
∆EN < 0.4 = non-polar covalent
∆EN between 0.4 and 2.0 = polar covalent
∆EN > 2.0 = ionic
δ used to indicate partial charges
Dipole movement is the measure of a molecule’s overall polarity
μ = Q (charge) * r (distance)
More details to come in Organic Chemistry
Bond Polarity & Chemical Bonds
Polar Bond
A polar bond is formed because one atom, of the compound, being more electronegative grabs more electron density from another atom.
The electronegative atom attempts to steal electrons.
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Types of Chemical Bonds
Non-Polar Bonds
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Non-Polar Bond
Joining of atoms with the same electronegativity
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Types of Chemical Bonds
Hydrogen Bonds
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Hydrogen Bonds
A strong non-bonding interaction that causes a quick, weak “chemical bond.”
Occurs when a hydrogen atom, attached to a highly electronegative atom, interacts with a lone electron from a nearby electronegative atom.
These bonds are broken almost immediately
Depends on temperature.
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Hydrogen Bond
Although hydrogen bonds are weak, the vast number of them in large molecules makes them collectively significant
The formation of water in various forms.
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Phases of Matter
Liquid
Solid
Gas
Elements and molecules can exist in all three phases
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Phases of Matter II
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Van der Waals Forces
Review