Unit 3 AP Chemistry MCQ

Front

What is the behavior of real gases compared to ideal gases?

Back

Real gases exhibit lower pressure than ideal gases due to intermolecular forces and occupy more volume than predicted by the ideal gas law.

Front

What type of intermolecular force is present in polar molecules?

Back

Dipole-dipole intermolecular forces are present in polar molecules, where positive and negative ends attract each other.

Front

What is hydrogen bonding and how does it occur in water?

Back

Hydrogen bonding occurs when a hydrogen atom covalently bonded to a highly electronegative atom (like oxygen) is attracted to another electronegative atom. In water, this results in strong attractions between water molecules.

Front

What factors influence the rate of gas diffusion?

Back

The rate of gas diffusion is influenced by the molecular weight of the gases and the temperature; lighter gases diffuse faster than heavier gases.

Front

What happens to hydrogen bonds in water when it changes from liquid to vapor?

Back

Hydrogen bonds between H2O molecules are broken when water changes from liquid to vapor.

Front

What is the significance of the ideal gas law?

Back

The ideal gas law (PV=nRT) relates pressure, volume, temperature, and number of moles of a gas, providing a model for understanding gas behavior under ideal conditions.

Front

How do intermolecular forces affect boiling and melting points?

Back

Stronger intermolecular forces result in higher boiling and melting points, as more energy is required to overcome these forces.

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

What is the role of temperature in gas behavior?

Back

Temperature affects the kinetic energy of gas particles; higher temperatures increase kinetic energy, leading to higher pressure and volume.

Front

What is the concept of partial pressure in a gas mixture?

Back

Partial pressure is the pressure exerted by a single component of a gas mixture, contributing to the total pressure of the mixture.