861 past contests
Topic 2 · Enthalpy change of reaction from bond enthalpies (hess's law)
Topic 2 · Riddle: zwitterion, a dipolar ion with both positive and negative charges
Topic 2 · Enthalpy as a state function: cyclic processes and hess's law applicability (true/false)
Topic 29 · Periodic trends in first ionization energy and isoelectronic ionic radii (true/false)
Topic 3 · Buffer solution ph: henderson-hasselbalch equation
Topic 25 · Major product of alkane monochlorination via the most stable (tertiary) radical intermediate
Topic 7 · Balancing half-reactions in acidic medium
Topic 15 · Riddle: adsorption, a surface phenomenon used by activated charcoal and silica gel
Topic 3 · Comparing a weak and strong acid of equal concentration: metal reaction, dilution, and titration (true/false)
Topic 2 · Vapor pressure, boiling point and relative intermolecular force strength between two liquids (true/false)
Topic 7 · Sum of the oxidation states of an element across several of its compounds
Topic 14 · Riddle: carbon monoxide, a colorless odorless linear gas
Topic 2 · Properties and strength of metallic bonding (true/false)
Topic 38 · Electrode processes and charge in galvanic and electrolytic cells (true/false)
Topic 5 · Empirical formula atom count of a homologous series member
Topic 9 · Mass of a reactant needed to produce a given amount of product, from a balanced equation
Topic 20 · Mass of solute in a solution from its molar concentration, volume and molar mass
Topic 25 · Naming the distinct monochlorination products of a branched alkane
Topic 40 · Identifying the oxidizing or reducing agent in a redox equation from oxidation-state changes
Topic 22 · Riddle: hexanoic acid, a goat-scented carboxylic acid