Front

What explains the very high melting and boiling point of water?

Back

Strong hydrogen bonds between water molecules.

Front

What type of intermolecular force is present in SiO₂?

Back

Covalent network.

Front

Which of the following has the highest boiling point: H₂, NH₃, N₂, O₂?

Back

NH₃.

Front

What is hydrogen bonding?

Back

A strong type of dipole-dipole interaction that occurs between molecules containing hydrogen bonded to highly electronegative atoms like N, O, or F.

Front

What phase change occurs if the substance's pressure increases from point A to point B?

Back

Condensation.

Front

Define dipole-dipole forces.

Back

Intermolecular forces that occur between polar molecules due to the attraction between the positive end of one molecule and the negative end of another.

Front

What are dispersion forces?

Back

Weak intermolecular forces that arise from temporary shifts in electron density in atoms or molecules, present in all substances.

Front

Explain the significance of molecular shape in determining boiling points.

Back

Molecular shape affects the strength of intermolecular forces; more symmetrical molecules may have lower boiling points due to weaker dispersion forces.

Front

What is the relationship between intermolecular forces and boiling point?

Back

Stronger intermolecular forces result in higher boiling points due to the increased energy required to separate molecules.

Front

What is the difference between evaporation and boiling?

Back

Evaporation occurs at the surface of a liquid at any temperature, while boiling occurs throughout the liquid at a specific temperature.