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Questions and Answers
What is the term for the different packing arrangement of crystalline molecules for the same compound?
Which of the following physical properties are different in different polymorphs?
What is the term for the attraction of solvent molecules with solute molecules or ions?
What is the term for when something is embedded in a polymorph to make it a pseudo-polymorph?
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A polymorph with a higher melting point temperature will have:
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Which intermolecular force is the strongest?
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Which type of intermolecular force involves temporary fluctuations in electron distribution within molecules?
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In dipole-dipole interactions, what is the nature of the attraction between molecules?
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Which atoms are commonly involved in hydrogen bonding?
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What type of forces are essential in determining the physical properties of substances despite being the weakest?
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Study Notes
Polymorphs
- Different packing arrangements of crystalline molecules for the same compound are known as polymorphs.
- Physical properties that differ in polymorphs include melting point, solubility, and density.
Intermolecular Forces
- Solvation is the attraction of solvent molecules with solute molecules or ions.
- Pseudopolymorphs are formed when something is embedded in a polymorph.
Polymorph Properties
- A polymorph with a higher melting point temperature will have stronger intermolecular forces.
Intermolecular Force Strength
- Hydrogen bonding is the strongest intermolecular force.
Temporary Fluctuations
- London dispersion forces involve temporary fluctuations in electron distribution within molecules.
Dipole-Dipole Interactions
- In dipole-dipole interactions, the attraction between molecules is due to the difference in electronegativity between atoms.
Hydrogen Bonding
- Hydrogen bonding typically involves atoms with high electronegativity, such as oxygen, nitrogen, and fluorine.
Physical Properties
- Weak intermolecular forces are essential in determining the physical properties of substances despite being the weakest.
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Description
Test your knowledge on polymorphism in chemistry with this quiz. Explore how molecules can exhibit different properties when packed in different ways, and learn about examples such as the polymorphism of CaCO3 into calcite and aragonite, and the different states of carbon as diamond and graphite.
