MDCAT Chemistry MCQs

Heating a fixed-volume gas raises pressure.
The relationship uses absolute temperature.

Hydrogen bonds require significant energy to overcome.
This raises water's boiling point relative to similar-size molecules.

Equal volumes of gases at the same temperature and pressure contain equal numbers of molecules.
More moles require more volume.

Each C=O bond is polar, but the molecule is linear and symmetric.
The bond dipoles cancel.

The ideal gas equation combines several gas laws.
It relates pressure, volume, amount, and absolute temperature.

Water has polar O-H bonds and a bent shape.
The bond dipoles do not cancel.

Low pressure keeps particles far apart.
High temperature reduces the relative importance of attractions.

Solid particles occupy fixed average positions.
They still vibrate about those positions.

Dalton's law treats each ideal gas independently.
Total pressure is the sum of partial pressures.

A liquid takes the shape of its container.
Its particles remain close but can flow past one another.

Particles move from regions of higher concentration toward lower concentration.
Diffusion occurs in gases, liquids, and solids.

A gas expands to fill its container.
Its particles are widely separated and move rapidly.