MDCAT Chemistry MCQs

Crystalline solids have repeating lattice structures.
They often have sharp melting points.

Glass is a common amorphous solid.
Such solids often soften over a temperature range.

The solvent is usually the component in larger amount.
The solute is dispersed at the molecular or ionic level.

Solubility depends on temperature and the nature of solute and solvent.
For gases, pressure also matters.

A saturated solution is in equilibrium with undissolved solute.
Additional solute will not dissolve under unchanged conditions.

More solute can dissolve in an unsaturated solution.
Its concentration is below the solubility limit.

Sublimation bypasses the liquid phase.
Dry ice changing to carbon dioxide gas is an example.

Each carbon has three sigma-bonding regions.
The remaining p orbitals form the pi bond.

Deposition is the reverse of sublimation.
Frost formation is a familiar example.

Each carbon has two electron domains.
Sp hybridization gives linear geometry and leaves two p orbitals for pi bonds.

At equilibrium, evaporation and condensation rates are equal.
Vapor pressure increases with temperature.

Sigma bonds have electron density along the internuclear axis.
Every single covalent bond is a sigma bond.