MDCAT 2026 MCQs

The mole ratio H2:NH3 is 3:2.
6 mol H2×2/3 = 4 mol NH3.

Percent yield is actual divided by theoretical times 100.
8/10×100 = 80%.

Stoichiometry uses balanced equations to relate amounts.
It supports mass, mole, particle, and gas calculations.

A molecular formula is a whole-number multiple of the empirical formula.
It applies to substances composed of discrete molecules.

The plasma membrane surrounds material and pinches inward.
Phagocytosis and pinocytosis are forms of endocytosis.

Balancing follows conservation of atoms and mass.
Coefficients change amounts, not chemical formulas.

Chemistry examines what matter is made of and how it behaves.
It also studies energy changes accompanying chemical processes.

Equation coefficients give stoichiometric ratios.
They may be interpreted as molecule or mole ratios.

Matter includes solids, liquids, gases, and plasma.
It is composed of atoms, molecules, or ions.

Once the limiting reactant is used up, no more product can form.
Other reactants may remain in excess.

An element cannot be broken down chemically into simpler substances.
Each element is identified by its atomic number.

An excess reactant is supplied beyond the stoichiometric requirement.
Some remains when the reaction is complete.