Prompt Library

Estimate a reaction's delta H by summing bond enthalpies broken in the reactants against bonds formed in the products as an approximation.

Write a Ksp expression from a dissolution equation, solve for molar solubility using stoichiometric exponents, or work a common ion effect problem.

Generate mole-to-mole and mass-to-mass stoichiometry problems from a balanced equation with full worked answer keys, or check a worked answer against an existing problem.

Predict whether an ionic compound dissolves in water using solubility rules and their exceptions, and classify a substance as a strong, weak, or nonelectrolyte.

Generate pH and pOH practice problems requiring conversion between H+, OH-, pH, and pOH using log and antilog relationships, with a full worked answer key.

Generate M1V1 = M2V2 dilution practice problems that solve for any of the four variables, including multi-step serial dilution chains, with each equation rearranged first.

Generate phase-change and heating-curve problems using q = mcΔT and q = mL, scaled from single-step water problems to full five-segment curves, with worked answers.

Generate physical-change and chemical-change scenarios to classify and defend, from straightforward examples to lookalike cases, using evidence rather than reversibility as the deciding test.

Solve PV equals nRT for pressure, volume, moles, or temperature, with Kelvin conversion, the matching R value, and every unit canceled.

Generate redox equations to analyze, assigning oxidation numbers, naming what's oxidized and reduced, and identifying the oxidizing and reducing agents without swapping labels.

Identify which intermolecular forces apply to a molecule and rank multiple molecules by relative boiling point, distinguishing intermolecular attraction from intramolecular covalent bonding.

Generate practice problems for deriving protons, neutrons, and electrons in an atom, isotope, or ion from atomic or mass number, or grade a submitted answer.

Classify a solution as unsaturated, saturated, or supersaturated using a solubility curve, and calculate how much more solute it can dissolve at a given temperature.

Generate reaction scenarios to classify as exothermic or endothermic, with an energy diagram explanation covering the activation energy hump both reaction types must climb.

Generate mass percent, parts per million, and mole fraction practice problems with every ratio built explicitly and the mass-based versus mole-based ppm distinction called out.

Generate unbalanced chemical equations at a chosen difficulty with a full atom-count answer key, or grade a submitted balanced equation against the original problem.