← MCAT Prep MCAT Chem/Phys Passage Practice 25 experimental passages (143 questions) across Chem/Phys disciplines — the passage-based reps this section is built on. Practice one at a time with full explanations, or run the whole set.
Practice all 25 passages Timed section — 59 Q · 95 min
Timed sections run at real AAMC length with a hard clock and a 118–132 section score; untimed practice shows explanations passage by passage.
biochemistry Inhibition of Alkaline Phosphatase Alkaline phosphatase (ALP) hydrolyzes phosphate monoesters. To characterize the enzyme, researchers incubated …
5 questions
general chemistry Buffering Capacity of an Acetate System Acetic acid (CH3COOH, K_a = 1.8 × 10^-5) is a weak monoprotic acid widely used to model physiological bufferin…
5 questions
physics A Zinc–Copper Galvanic Cell Driving a Resistor A student assembled a Daniell cell to study how a spontaneous redox reaction can drive an electric current. On…
5 questions
organic chemistry Isolating Benzoic Acid by Acid–Base Extraction A student was given a dichloromethane (CH2Cl2) solution containing a mixture of benzoic acid (a carboxylic aci…
5 questions
physics Blood Flow Through a Stenotic Artery Cardiovascular physiologists model blood flow using the principles of fluid dynamics. Treating blood as an ide…
5 questions
thermodynamics Coupling ATP Hydrolysis to Glucose Phosphorylation The first step of glycolysis phosphorylates glucose to glucose-6-phosphate (G6P). On its own, the direct react…
5 questions
general chemistry Kinetics of a Bimolecular Substitution A chemist studied the rate of the reaction A + B → products by the method of initial rates. The concentrations…
6 questions
physics Imaging with a Converging Lens An optics student characterized a thin converging (biconvex) lens on an optical bench. The lens had a focal le…
6 questions
general chemistry A Copper Concentration Cell To probe how ion concentration controls cell voltage, a chemist built a concentration cell from two copper ele…
6 questions
biochemistry Quantifying NADH by Absorption Spectroscopy The reduced cofactor NADH absorbs ultraviolet light strongly at 340 nm, whereas its oxidized form NAD^+ does n…
6 questions
general chemistry Calcium Oxalate and Kidney Stones Calcium oxalate (CaC2O4) is the principal component of most kidney stones. To model stone formation, researche…
6 questions
general chemistry Permanganate Titration of Iron The iron content of an ore can be determined by redox titration with potassium permanganate. A student dissolv…
6 questions
physics Flow Through Intravenous Catheters Intravenous (IV) fluid delivery is driven by gravity: a fluid bag hangs a height h above the catheter, providi…
5 questions
physics Doppler Ultrasound of Blood Flow Doppler ultrasound measures blood velocity from the frequency shift of sound reflected off moving red blood ce…
5 questions
general chemistry Nitrogen Loading in Hyperbaric Diving Researchers at a hyperbaric medicine center studied inert-gas uptake in divers breathing compressed air (appro…
5 questions
physics Fluorine-18 Decay in PET Imaging Positron emission tomography (PET) relies on short-lived positron-emitting isotopes. The most widely used trac…
5 questions
physics Photocell Threshold and Flame Emission To characterize a metal cathode for use in a light sensor, students illuminated a vacuum photocell with a seri…
6 questions
physics Prescribing Lenses for Refractive Error An optometry clinic assessed three adult patients whose refractive errors are summarized in Figure 1. For each…
5 questions
physics Capacitive Discharge in a Defibrillator A biomedical engineering team bench-tested a defibrillator, a device that stores electrical energy in a capaci…
6 questions
physics Torque Balance in the Forearm A kinesiology laboratory modeled the human forearm as a rigid lever to study elbow loading during isometric ho…
5 questions
organic chemistry Purifying a Borohydride Reduction Mixture A student reduced benzophenone with sodium borohydride (NaBH4) in methanol to prepare benzhydrol (diphenylmeth…
5 questions
organic chemistry An Unknown Carbonyl Compound by IR and NMR A colorless liquid isolated from a fermentation extract was submitted for structure determination. Combustion …
6 questions
biochemistry Titration and Focusing of Glutamate Amino acids are polyprotic: each ionizable group titrates near its own pK_a, and the isoelectric point (pI) — …
5 questions
organic chemistry Nonenzymatic Glycation of Hemoglobin In aqueous solution, D-glucose exists almost entirely (>99.9%) as cyclic pyranose forms; the reactive open-cha…
5 questions
thermodynamics Calorimetry of Protein Unfolding Differential scanning calorimetry (DSC) measures the excess heat capacity (C_p) of a dilute protein solution a…
6 questions
Discrete questions Discrete Questions The following questions are independent of any passage — each stands alone, as in the discrete sets on the rea…
8 questions