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What type of intermolecular interaction predominates in each substance? A. Ammonia (NH3) B. Ethane (C2H6) C....

What type of intermolecular interaction predominates in each substance? A. Ammonia (NH3) B. Ethane (C2H6) C. Helium (He) D Potassium Chloride (KCl) how do you know?

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Answer #1

how do you know?

ALL substances have dispersion forces (london dispersion forces/ van der waals forces)

polar molecules have a higher force, called the "dipole-dipole" forces

Hydrogen bonds are givne due to the presence of O,N,F with H

ionic molecules have ion-dipole forces, which are the strongest one.

A. Ammonia (NH3)

this is pollar, therefore expect little forces of dispersion forces. There is also hydrogen bonding due to N and H. The main force must be dipole-dipole interactions

B. Ethane (C2H6)

nonpolar, only forces are those of dispersion foces

C. Helium (He)

nonpolar, only forces are those of dispersion foces

Potassium Chloride (KCl)

ionic compound, therefore; ion-dipole, the strongest type of interaction.

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