Practice Problems

Chemistry is not a spectator sport. Attempt each problem, get instant feedback and read the explanation.

flask Acids & Bases

8 problems

Acids and Bases Practice

Practice acid-base models, conjugate pairs, and strong versus weak acids and bases.…

8 problems

pH and pOH Practice

Practice pH and pOH calculations for strong acids and bases, including the logarithmic scale.…

flask Atomic Structure

8 problems

Atomic Structure Practice

Practice protons, neutrons, electrons, atomic number, mass number, and isotopes with clear worked explanations…

8 problems

Electron Configuration Practice

Practice writing electron configurations, counting valence electrons, and applying the Aufbau principle.…

flask Chemical Bonding & Structure

8 problems

Chemical Bonding Practice

Practice ionic, covalent, and metallic bonding: how bonds form, which atoms pair up, and typical properties.…

8 problems

VSEPR and Molecular Shape Practice

Practice VSEPR theory: predicting molecular shapes, bond angles, and the effect of lone pairs.…

flask Redox & Electrochemistry

8 problems

Electrochemistry Practice

Practice galvanic cells, cell potential, the Nernst equation, and electrolytic cells with worked solutions.…

8 problems

Redox and Oxidation States Practice

Practice oxidation states, identifying oxidizing and reducing agents, and the OILRIG mnemonic.…

flask Chemical Equilibrium

8 problems

Chemical Equilibrium Practice

Practice equilibrium constants, ICE tables, reaction quotient, and Le Chatelier's principle with worked calcul…

flask States of Matter & Gases

8 problems

Gas Laws Practice

Practice Boyle's, Charles's, and the ideal gas law plus Dalton's law of partial pressures with worked calculat…

flask General Chemistry

8 problems

Balancing Chemical Equations Practice

Practice balancing chemical equations: finding coefficients, checking atom conservation, and avoiding common m…

8 problems

Mole Concept Practice

Practice Avogadro's number, molar mass, and converting between grams, moles, and particles with step-by-step s…

8 problems

Stoichiometry Practice

Practice mole ratios, limiting reactants, theoretical yield, and percent yield with fully worked solutions.…

flask Chemical Kinetics

8 problems

Chemical Kinetics Practice

Practice rate laws, reaction order, half-life, catalysts, and the Arrhenius equation with worked solutions.…

flask Math for Chemistry

8 problems

Math for Chemistry Practice

Practice scientific notation, logarithms, significant figures, and unit conversions for chemistry.…

flask Nuclear Chemistry

8 problems

Nuclear Chemistry Practice

Practice radioactive decay, half-life calculations, radiation types, fission, and fusion.…

flask Organic Chemistry

8 problems

Organic Chemistry Basics Practice

Practice functional groups, alkane nomenclature, hydrocarbons, and isomerism basics.…

flask Periodic Table & Periodicity

8 problems

Periodic Trends Practice

Practice atomic radius, ionization energy, and electronegativity trends across periods and down groups.…

flask Solutions & Solubility

8 problems

Solutions and Concentration Practice

Practice molarity, dilution, molality, and colligative properties with worked numerical solutions.…

flask Thermochemistry & Thermodynamics

8 problems

Thermochemistry Practice

Practice calorimetry, enthalpy, Hess's law, entropy, and Gibbs free energy with worked numerical solutions.…