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10 experimental passages (62 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.
Alkaline phosphatase (ALP) hydrolyzes phosphate monoesters. To characterize the enzyme, researchers incubated …
5 questions
Acetic acid (CH3COOH, Ka = 1.8 × 10^-5) is a weak monoprotic acid widely used to model physiological buffering…
A student assembled a Daniell cell to study how a spontaneous redox reaction can drive an electric current. On…
A student was given a dichloromethane (CH2Cl2) solution containing a mixture of benzoic acid (a carboxylic aci…
Cardiovascular physiologists model blood flow using the principles of fluid dynamics. Treating blood as an ide…
The first step of glycolysis phosphorylates glucose to glucose-6-phosphate (G6P). On its own, the direct react…
A chemist studied the rate of the reaction A + B → products by the method of initial rates. The concentrations…
6 questions
An optics student characterized a thin converging (biconvex) lens on an optical bench. The lens had a focal le…
To probe how ion concentration controls cell voltage, a chemist built a concentration cell from two copper ele…
The reduced cofactor NADH absorbs ultraviolet light strongly at 340 nm, whereas its oxidized form NAD^+ does n…
The following questions are independent of any passage — each stands alone, as in the discrete sets on the rea…
8 questions