AP Chemistry Unit 3 Review

Front

What type of intermolecular force is present in HCl?

Back

Dipole-dipole interaction.

Front

Rank the following in order of strength: covalent bond, London forces, hydrogen bond, dipole-dipole attraction.

Back

Covalent bond > Hydrogen bond > Dipole-dipole > London forces.

Front

What is the Rf value for a component in chromatography?

Back

The Rf value is the ratio of the distance traveled by the compound to the distance traveled by the solvent front.

Front

Which type of compound is likely to have the highest solubility in water?

Back

Ionic compounds generally have the highest solubility in water.

Front

What factor does NOT affect the rate at which a solid solute dissolves?

Back

The vapor pressure of the solvent does not affect the rate of dissolution.

Front

Define dipole-dipole interactions.

Back

Dipole-dipole interactions are attractive forces between the positive end of one polar molecule and the negative end of another polar molecule.

Front

What is the difference between ionic and covalent bonds?

Back

Ionic bonds involve the transfer of electrons from one atom to another, while covalent bonds involve the sharing of electrons between atoms.

Front

Explain the concept of solubility.

Back

Solubility is the ability of a substance to dissolve in a solvent at a given temperature and pressure.

Front

What is the significance of the Rf value in chromatography?

Back

The Rf value helps identify substances based on their movement relative to the solvent front.

Front

What are London dispersion forces?

Back

London dispersion forces are weak intermolecular forces arising from temporary dipoles in molecules.