Chemistry
Molecules, periodic table, reactions, pH scale, and titration
Unit Cell SC / BCC / FCC
Conventional cubic cells; yaw–pitch projection — lattice sites before basis detail.
Sequential Stern–Gerlach
Two SG devices: P(up on SG₂) = cos²(θ/2) or sin²(θ/2) after |±z⟩ filter.
Molecule Viewer (3D)
Common molecules in 3D. Rotate, zoom. Ball-and-stick models.
Periodic Table
Click element for properties, electron config, and uses.
Electron Configuration
Fill orbitals visually with Aufbau principle animation.
Balancing Equations
Interactive practice. Drag coefficients. Check balance.
pH Scale
Slider from 0 to 14 with common substances and color indicators.
Titration Simulator
Add base to acid. pH curve in real time. Find equivalence point.
Reaction Rate
Arrhenius k(T), order 0/1/2, [A](t) curves and particle tank.
Orbital Shapes (Schematic)
2D |ψ|² colormap for s-, p-, and d-like angular patterns (pedagogical, not HF).
Particle in a 1D Box
Superposition of n=1 and n=2: time evolution of |Ψ|² and ⟨E⟩ (model units).
Gaussian Wave Packet
Free spreading: σ(t) from dispersion with ℏ = m = 1; uncertainty intuition.
Nernst Equation
E = E° − (RT/nF) ln Q: sliders for E°, n, T, and reaction quotient.
Buffer Solution
Henderson–Hasselbalch vs strong acid: pH curve as H⁺ is added (mole model).
Gray–Scott Patterns
Reaction–diffusion u,v; coral / mitosis / worms / spirals; D_u, D_v, Δt.
Gibbs Free Energy
ΔG = ΔH − TΔS; sign vs spontaneity at constant p,T (no Q or K).