Chembook vs Introductory Statistics Tutor

Chembook is an offline chemistry reference built around things you can turn, step through, and take apart. REACTION MECHANISMS IN 3D Step through 128 reaction mechanisms frame by frame, with curved electron-pushing arrows drawn on the actual atoms. Explore quantum-optimized structures alongside teaching models of the steps between them. Switch between the 3D model and a clean 2D skeletal depiction. ADVANCED TOPICS Explore six interactive lessons: collision theory, potential energy surfaces, Woodward–Hoffmann rules, crystal field and Jahn–Teller effects, Walsh diagrams, and band theory. Follow reaction trajectories across energy landscapes. Change molecular geometry to see orbital energies shift, explore spin and distortion, and watch discrete energy levels become bands. ATOMIC & MOLECULAR ORBITALS Rotate orbital isosurfaces in 3D, from s, p, d and f atomic orbitals to computed molecular orbitals. Explore their shapes, nodes and wavefunction signs. SPECTROSCOPY REFERENCE 1H and 13C NMR shift tables, IR and Raman bands, mass spectrometry and UV-Vis, with tappable reference entries that place peaks on a live spectrum. Includes an interactive n+1 splitting-tree tool. MOLECULAR DYNAMICS LAB Run interactive molecular simulations on your device. Explore argon, water and ionic systems, adjust temperature and density, and watch molecular motion and the radial distribution function update as the simulation runs. STRUCTURES & CONFORMERS Chair flips, anomers, amino acids, unit cells and framework solids in 3D, with a Ramachandran plot and potential-energy scans you can drag. PERIODIC TABLE All 118 elements with trends, a comparison view and detailed properties. QUIZ Seven modes: periodic table, compound hunt, reaction mechanisms, spectra identification, vibrational mode matching, nomenclature, and amino acids. BUILT FOR OFFLINE STUDY All reference content, lessons and visualizations work offline. No Chembook account, no sign-in, no analytics, no ads and no personal data collection. Your notes and study progress stay on your device. An internet connection is needed for purchases and restores. FREE AND PRO 20 core reaction mechanisms, the full periodic table, all spectroscopy reference, orbitals, structures, and the molecular dynamics lab are free. A single one-time purchase unlocks the remaining 108 mechanisms, all six Advanced Topics lessons and unlimited quiz play.

Introductory Statistics Tutor helps you explore statistical ideas, practise them, and understand what results mean. LEARN Follow guided lessons across 15 topics, from describing data and probability to sampling, confidence intervals, hypothesis tests, correlation, regression, and ANOVA. EXPLORE Experiment with 14 interactive labs. Change inputs, make a prediction, observe the result, and explain what it means. PRACTICE & MASTER Work through 600 conceptual assessment questions with visual prompts and explanations. Review areas that need attention and prepare with a 60-question exam simulation. REFERENCE & PROGRESS Look up formulas, assumptions, and guidance for choosing statistical methods. Track lesson completion and practice performance. Choose your preferred app language in Settings. Topic 1 is free. One in-app purchase unlocks the remaining curriculum, interactive labs, and advanced review tools. Designed for students learning introductory statistics.