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Abstract The emission spectra of styrene (ST)-triethylamine (TEA) systems were measured under steady-state illumination conditions in some tetrahydrofuran (THF)-protic solvent mixtures. The fluorescence spectrum of the ST-TEA system in THF consists of two bands (band A at 304 nm (fluorescence of ST) and band B at 460 nm (emission from an exciplex)). The intensity of band A increased and that of band B decreased with increasing amounts of protic solvents in THF-protic solvent mixtures. The increase in the intensity of band A was explained by the decrease in the concentration of free amine owing to the hydrogen-bonding interaction (or protonation) between TEA and protic solvents. The decrease in the intensity of band B was considered to be caused by the decrease in the concentration of free amine upon the addition of protic solvents and the enhanced conversion of the exciplex to an ion pair with increasing solvent polarity. The polar effect was expressed as a function of the relative permittivity of the solution.
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How are hydrogen bonds different from coverlet bonds?
Hydrogen bonds are weaker electrostatic attractions between a hydrogen atom covalently bound to an electronegative atom and another electronegative atom. Covalent bonds, on the other hand, involve the sharing of electrons between atoms and are typically stronger than hydrogen bonds. Covalent bonds are the primary bonds that hold atoms together in molecules.
What kind of bonds do alcohols form between individual molecules?
Alcohols can form hydrogen bonds between individual molecules. These hydrogen bonds are attractions between the partially positive hydrogen atom of one molecule and the partially negative oxygen atom of another molecule. This plays a significant role in the physical and chemical properties of alcohols.
Covalent bonds are weaker than the hydrogen bonds used to hold water molecules together.?
No, hydrogen bonds are weaker than the covalent O-H bonds.
Are hydrogen bonds a type of intermolecular force?
Yes, hydrogen bonds are a type of intermolecular force. They are attractions between a hydrogen atom bonded to an electronegative atom (such as oxygen or nitrogen) and a nearby electronegative atom. Hydrogen bonds are weaker than covalent or ionic bonds but are important in determining the structure and properties of molecules.
What are the similarities between hydrogen bond and ionic bonds?
Both hydrogen bonds and ionic bonds involve attractions between charged particles. In hydrogen bonds, a hydrogen atom is attracted to an electronegative atom (such as oxygen or nitrogen) with a partial negative charge. In ionic bonds, a positively charged ion is attracted to a negatively charged ion to form a bond. Both types of bonds are important in determining the properties of molecules and compounds.
What is the differace between covalent and hydrogen bonds?
Covalent bonds share electrons but hydrogen bonds don't. The latter is a special incident of dipole attractions.
What are the weak chemical attractions between water molecules called?
Hydrogen bonds.
What hydrogen bonds?
extra strong intermolecular attractions between polar molecules -apex
What are hydrogen-bonds?
extra strong intermolecular attractions between polar molecules -apex
Hydrogen bonds are what kind of bonds?
strong polar attractions between molecules involving h, f, o, and n
How are hydrogen bonds different from coverlet bonds?
Hydrogen bonds are weaker electrostatic attractions between a hydrogen atom covalently bound to an electronegative atom and another electronegative atom. Covalent bonds, on the other hand, involve the sharing of electrons between atoms and are typically stronger than hydrogen bonds. Covalent bonds are the primary bonds that hold atoms together in molecules.
What kind of bonds do alcohols form between individual molecules?
Alcohols can form hydrogen bonds between individual molecules. These hydrogen bonds are attractions between the partially positive hydrogen atom of one molecule and the partially negative oxygen atom of another molecule. This plays a significant role in the physical and chemical properties of alcohols.
Covalent bonds are weaker than the hydrogen bonds used to hold water molecules together.?
No, hydrogen bonds are weaker than the covalent O-H bonds.
What bonds are broken when water evaporates into water vapor?
Hydrogen Bonds.(Hydrogen bonding is another term for the dipole-dipole attractions between H2O molecules.) A Hydrogen bond is between a H atom in one molecule and either a O, N, or F atom in another.
Are hydrogen bonds a type of intermolecular force?
Yes, hydrogen bonds are a type of intermolecular force. They are attractions between a hydrogen atom bonded to an electronegative atom (such as oxygen or nitrogen) and a nearby electronegative atom. Hydrogen bonds are weaker than covalent or ionic bonds but are important in determining the structure and properties of molecules.
What are the similarities between hydrogen bond and ionic bonds?
Both hydrogen bonds and ionic bonds involve attractions between charged particles. In hydrogen bonds, a hydrogen atom is attracted to an electronegative atom (such as oxygen or nitrogen) with a partial negative charge. In ionic bonds, a positively charged ion is attracted to a negatively charged ion to form a bond. Both types of bonds are important in determining the properties of molecules and compounds.
Covalent bonds are weaker than the hydrogen bonds used to hold water molecules together-?
B.False(apex)
