MDCAT Chemistry MCQs

For a 1:1 salt, both ion concentrations equal the molar solubility s.
Therefore Ksp = s².

Average disappearance rate = decrease in concentration divided by time.
The positive magnitude is used for a reactant-disappearance rate.

Kc contains product concentrations over reactant concentrations.
Each concentration is raised to its stoichiometric coefficient.

An equilibrium shifts in the direction that opposes the imposed change.
Applying this rule gives the stated direction.

An equilibrium shifts in the direction that opposes the imposed change.
Applying this rule gives the stated direction.

An equilibrium shifts in the direction that opposes the imposed change.
Applying this rule gives the stated direction.

An equilibrium shifts in the direction that opposes the imposed change.
Applying this rule gives the stated direction.

PV = nRT, so P = nRT/V.
Substitution gives approximately 99.7 kPa.

PV = nRT, so P = nRT/V.
Substitution gives approximately 101 kPa.

Volume at STP = moles × 22.4 L mol⁻¹.
The calculated volume is 11.2 L.

Volume at STP = moles × 22.4 L mol⁻¹.
The calculated volume is 22.4 L.

Volume at STP = moles × 22.4 L mol⁻¹.
The calculated volume is 33.6 L.