IM forces-substances of increasing melting points

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SUMMARY

The discussion focuses on the order of substances based on their melting points, specifically identifying the correct sequence as Cl2 < CHF3 < CHCl3 < H2O < SiO2. It establishes that SiO2, a giant covalent structure, possesses the highest melting point due to its strong covalent bonds, while Cl2 has the lowest melting point due to only experiencing van der Waals forces. The melting points of H2O and CHF3 are influenced by hydrogen bonding and dipole forces, respectively, with H2O exhibiting stronger intermolecular forces than CHF3.

PREREQUISITES
  • Understanding of intermolecular forces, including hydrogen bonding and van der Waals forces.
  • Knowledge of molecular structures, specifically giant covalent structures like SiO2.
  • Familiarity with melting point concepts and their relation to molecular interactions.
  • Basic chemistry terminology related to molecular polarity and bonding types.
NEXT STEPS
  • Research the properties of giant covalent structures and their impact on melting points.
  • Study the differences between hydrogen bonding and dipole-dipole interactions.
  • Explore the concept of van der Waals forces and their effects on molecular properties.
  • Investigate the melting points of various substances and how intermolecular forces influence them.
USEFUL FOR

Chemistry students, educators, and professionals interested in understanding the relationship between intermolecular forces and melting points of substances.

joe98
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Q.In which of the answers below are the substances listed in order of increasing melting
point?
a) Cl2 < CHF3 < H2O < CHCl3 < SiO2
b) Cl2 < CHCl3 < CHF3 < H2O < SiO2
c) Cl2 < CHF3 < CHCl3 < H2O < SiO2
d) Cl2 < H2O < CHF3 < CHCl3 < SiO2
e) SiO2 < H2O < CHCl3 < CHF3 < Cl2

How can we tell the melting points of these substances by there intermolecular forces?

ok H20 has hydrogen bonding, SiO2 has strong covalent bonds,CHF3 has dipole forces

So how can develop a trend in melting points with the IM forces?

Any suggestions?

The answer is C
 
Chemistry news on Phys.org
SiO2 is a giant covalent structure - a macromolecule so it has the highest melting point
H2O has hydrogen bonding
Cl2 a gas has the lowest melting point as only vanderwaal ofrces exist

I'm not sure about CHCl3 and CHF3 - i though CHF3 will have a higher MP because of hydrogen bonding
 

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