Unit 3 AP Chemistry MCQ

Front

What is the relationship between conductivity and the number of ions in solution?

Back

Higher conductivity indicates a greater number of ions in solution, as ions are responsible for conducting electricity.

Front

Define dipole-dipole intermolecular forces.

Back

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

Front

What happens to the volume of a gas when it is cooled?

Back

According to Charles's Law, the volume of a gas decreases as the temperature decreases, provided the pressure remains constant.

Front

What is the ideal gas law?

Back

The ideal gas law is represented by the equation PV=nRT, where P is pressure, V is volume, n is the number of moles, R is the ideal gas constant, and T is temperature in Kelvin.

Front

Explain the concept of real gases versus ideal gases.

Back

Real gases deviate from ideal behavior due to intermolecular forces and the volume occupied by gas particles, especially at high pressures and low temperatures.

Front

What factors affect the solubility of a compound in a solvent?

Back

Factors include temperature, pressure, and the nature of the solute and solvent (polarity, molecular size, etc.).

Front

What is the principle of 'like dissolves like'?

Back

This principle states that polar solvents dissolve polar solutes, and nonpolar solvents dissolve nonpolar solutes.

Front

Define molarity.

Back

Molarity is a measure of concentration, defined as the number of moles of solute per liter of solution (mol/L).

Front

What is the significance of the van der Waals forces in real gases?

Back

Van der Waals forces account for the attractive and repulsive forces between molecules, affecting the behavior of real gases compared to ideal gases.

Front

How does temperature affect gas volume according to Charles's Law?

Back

Charles's Law states that the volume of a gas is directly proportional to its temperature in Kelvin, meaning as temperature increases, volume increases.