Untimed practice sets. Take one here, or find them embedded right inside a course's concepts.
Pick a subject to see its topics.
Ten questions on the second law: engines and their efficiency, a Carnot engine, a freezer, entropy, reversible processes and an impossible machine. Every answer has a worked solution that names the usual slip.
Ten questions on entropy, Gibbs energy and spontaneity. Untimed.
Ten questions on combinations. Untimed.
Ten questions on chordates and the vertebrate classes. Untimed.
Ten questions on tables, plots and trends in Python. Untimed.
Ten questions on gas processes: Mayer's relation, heating at steady pressure, isothermal and isochoric changes, and quick squeezes that heat a gas. Every answer has a worked solution that names the usual slip.
Ten questions on enthalpy, calorimetry and Hess's law. Untimed.
Ten questions on permutations. Untimed.
Ten questions on the non-chordate phyla. Untimed.
Ten questions on tables, missing values, groups, joins and log-log graphs. One asks you to find a mistake.
Ten questions on heat, work and the first law: signs of heat and work, a piston, a gas's internal energy, a cycle on a pressure-volume graph, Joule's paddle wheel and a free expansion. Every answer has a worked solution that names the usual slip.
Ten questions on systems, work, heat and the first law. Untimed.
Ten questions on the counting principles and factorials. Untimed.
Ten questions on the basis of animal classification. Untimed.
Ten questions on drawing and choosing graphs. One asks you to find a mistake.
Ten questions on heat transfer: a window, two rods joined end to end, the sea breeze, Stefan's and Wien's laws, and a cooling cup of soup. Every answer has a worked solution that names the usual slip.
Ten questions on molecular orbitals, bond order, magnetism and hydrogen bonds. Untimed.
Ten questions on special angles and identities. Untimed.
Ten questions on genes, chromosomes and sex determination. Untimed.
Ten questions on arrays, formulas on arrays, masks and tables. One asks you to find a mistake.
Ten questions on heat: warming water, mixing, a copper block in water, melting ice, steam burns, a kettle, a calorimeter and ice in a drink. Every answer has a worked solution that names the usual slip.
Ten questions on VSEPR, sigma and pi bonds and hybridisation. Untimed.
Ten questions on the six ratios of an angle. Untimed.
Ten questions on variation and Mendel's crosses. Untimed.
Ten questions on text files, CSV and JSON. One asks you to find a mistake.