Molecular Covalent

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
Molecular covalent

Network covalent

Ionic

Metallic
Let’s look at the
table!
Type
Structure
Hardness
Melting/
boiling point
Conductivity
Molecular
covalent
Click
Click
Click
Click
Network
covalent
Click
Click
Click
Click
Ionic
Click
Click
Click
Click
Metallic
Click
Click
Click
Click
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
Crystal lattice structure: alternating cations and
anions held together by electrostatic attractions
(+ attracted to -, just like a magnet!)
Ionic compounds are hard!! Make sure in your
table, you also know what it means that an
ionic compound is brittle and why!
http://auden.webster.edu/~scottsus/characteri
stics.htm
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http://www.kentchemistry.com/links/bonding/
ionicProps.htm
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Read the caption for the three pictures in the
link below.
http://www.chem.ufl.edu/~itl/2051_s97/week
_1/ionic.html
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http://sixthsense.osfc.ac.uk/chemistry/bondin
g/metallic.asp
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Scroll down to “Strength and workability” and
write information about hardness,
malleability, and ductility
http://www.chemguide.co.uk/atoms/structure
s/metals.html#top
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Scroll to slide 8!!
http://www.slideshare.net/chemistryhelpline/p
roperties-of-compounds-ionic-covalentand-metallic
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Scroll to slide 8!!
http://www.slideshare.net/chemistryhelpline/p
roperties-of-compounds-ionic-covalentand-metallic
http://www.avogadro.co.uk/structure/chemstr
uc/network/g-molecular.htm
Click on the link, and press “covalently bond C
atoms” and “keep bonding” to see the
structure.
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http://www.avogadro.co.uk/structure/chemstr
uc/network/g-molecular.htm
Read the first paragraph!
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Scroll to slide 4!!
http://www.mi.mun.ca/users/pfisher/Chemistr
y1011_92.pdf
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Since there is a network of strong covalent
bonding, network covalent solids are very
hard.
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Molecular covalent are all nonmetal atoms.
You drew examples of these when we did
lewis structures. The molecules are held
together by intermolecular forces. Here is an
example:
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Since molecular covalent molecules are held
together by IMFs which are MUCH weaker
than bonds, molecular covalents are
considered soft molecules.
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Scroll a ways down to “electrical conductivity”
http://www.chemguide.co.uk/atoms/structure
s/molecular.html
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2nd paragraph!!
http://www.chemguide.co.uk/atoms/structure
s/molecular.html
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