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Questions and Answers
What is the term for the different packing arrangement of crystalline molecules for the same compound?
What is the term for the different packing arrangement of crystalline molecules for the same compound?
- Solvation
- Polymorphism (correct)
- Amorphism
- Anisotropism
Which of the following physical properties are different in different polymorphs?
Which of the following physical properties are different in different polymorphs?
- Density
- Hardness
- Pseudo-polymorph (correct)
- Compressibility
What is the term for the attraction of solvent molecules with solute molecules or ions?
What is the term for the attraction of solvent molecules with solute molecules or ions?
- Amorphism
- Anisotropism
- Solvation (correct)
- Semicrystalline arrangements
What is the term for when something is embedded in a polymorph to make it a pseudo-polymorph?
What is the term for when something is embedded in a polymorph to make it a pseudo-polymorph?
A polymorph with a higher melting point temperature will have:
A polymorph with a higher melting point temperature will have:
Which intermolecular force is the strongest?
Which intermolecular force is the strongest?
Which type of intermolecular force involves temporary fluctuations in electron distribution within molecules?
Which type of intermolecular force involves temporary fluctuations in electron distribution within molecules?
In dipole-dipole interactions, what is the nature of the attraction between molecules?
In dipole-dipole interactions, what is the nature of the attraction between molecules?
Which atoms are commonly involved in hydrogen bonding?
Which atoms are commonly involved in hydrogen bonding?
What type of forces are essential in determining the physical properties of substances despite being the weakest?
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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