AP CHEMISTRY UNIT 3 REVIEW

Front

What does a higher Rf value in chromatography indicate about a substance's solubility and adsorption?

Back

A higher Rf value indicates that the substance is less strongly adsorbed onto the stationary phase and more soluble in the mobile phase.

Front

Which compound has the highest boiling point: NH3, CH4, or H2O?

Back

NH3 has the highest boiling point due to hydrogen bonding.

Front

What type of compounds generally have the highest solubility in water?

Back

Ionic compounds generally have the highest solubility in water.

Front

Which molecule is the most polar: HCl, HF, or CH4?

Back

HF is the most polar molecule due to the high electronegativity difference between H and F.

Front

What property of elements on the periodic table is important for determining intermolecular forces?

Back

Electronegativity is important for determining intermolecular forces.

Front

What is the significance of the Rf value in chromatography?

Back

The Rf value indicates the relative distance traveled by a compound compared to the solvent front, reflecting its solubility and interaction with the stationary phase.

Front

How does hydrogen bonding affect the boiling point of a substance?

Back

Hydrogen bonding increases the boiling point of a substance due to the strong attractive forces between molecules.

Front

What is the relationship between molecular polarity and solubility in water?

Back

Polar molecules tend to be more soluble in water due to their ability to interact with water molecules.

Front

What factors influence the strength of intermolecular forces?

Back

Factors include molecular size, shape, polarity, and the presence of functional groups.

Front

How can you determine if a molecule is polar or nonpolar?

Back

A molecule is polar if it has a significant difference in electronegativity between its atoms and an asymmetrical shape.