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Intermolecular attractions resulting from the constant motion of electrongs and the creation of instantaneaoud dipoles and induced dipoles. The more electrons.... the stronger LDF... (increase as the mass of the atom or molecule indcreases). These forces are very weak, because the dipoles created here are temporary. act bewteen all molecules, buy they are the only intermolecular forces acting on noble gases and non- polar molecular compounds.
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Van Der Waals forces ( London Dispersion forces)
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The polarity of a compound can significantly affect the physical properites of that compound. As an example, consider how a mocules solubility is affected by its _____. Recall that "like dissolves like"
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Polarity
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Refers to synthetic polymers and biopolymers (such as DNA or proteins) as well as large non-polymer molecules such as lipids.
- very large covalently bonded molecules but not generally interchangable |
Macromolecules
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Essentially composed of a relatively small unit ( monomer) that repeats over and over again
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Polymer
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Polyvinyl chloride
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Examples of synthetic polymers
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A plyamide made from 2 different molecules by condensation reaction
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Nylon
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DNA and proteins
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Examples of biopolymers
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larger covalently- bonded molecules
- contain no discrete molecular units - form a continuours network of conalentrly bonded atoms - include allotropes of carbon(graphite,diamonds, and fullerenes) |
Network covalent solids
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All of the carbon atoms four identical bonds in neighboring carbons
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Diamonds
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The carbon atoms have 3 strong bonds to other carbons, alll in the same plane
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Graphite
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Sonisist of 60 carbon atoms arranged in hexagons and pentagons to give a geodesic spherical structure similar to a soccer ball
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Buckminsterfullerenes or buckyballs or fullerenes
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Which molecule is nonpolar?
a) H2O b)NH3 c)CO d)CO2 |
D
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Nitrogen gas, N2, will become a liquid at low temperatures primarily because of
a) london dispersion forces b)hydrogen bonding c)covalent bonding d)dipole-dipole interactions |
D
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When compared to H2S, H20 has a higher boiling point because H20 contains stronger
a. metallic bonds b. covalent bonds c.ionic bonds d.hydrogen bonds |
D
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Which kinds of bonds are found in a sample of liquid H2O?
a. covalent bonds only b.hydrogen bonds only c.both covalent and hydrogen d.both ionic and hydrogen bonds |
C
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