Domain: Natural Science — Chemistry
Target concept: Hydrogen Peroxide Decomposition in Aqueous Solution Catalyzed by Iodides (uniform ox**

Video generation prompt: On the laboratory bench, two transparent beakers are placed side by side, each containing colorless hydrogen peroxide. Potassium iodide is added to the beaker on the left, while the beaker on the right remains unchanged. The two beakers are gently shaken.

Evaluation guide:
(i) Target concept: Catalytic decomposition of H₂O₂ by I⁻ ions producing O₂ gas bubbles.
Minimum mechanism: Presence of soluble iodide source (e.g., KI) must trigger rapid O₂ evolution in H₂O₂ solution; absence of catalyst must yield no detectable gas evolution under same conditions; reaction must proceed in aqueous phase without side products altering color or clarity.
(ii)Storyline: Frame 0–2: Static wide shot showing two identical transparent beakers side-by-side, both filled with colorless liquid. Frame 3–4: Hand/dropper enters top of left beaker and delivers potassium iodide (solid crystals or clear solution). Frame 5–6: Both beakers undergo synchronized gentle shaking motion (visible meniscus oscillation). Frame 7–10: Left beaker shows sustained bubble nucleation and rise; right beaker surface remains flat and bubble-free. Perspective: Fixed frontal bench-level view; full beakers always fully visible; no occlusion; lighting reveals liquid transparency and bubble contrast.

Manual:
Experimental Procedure
1. Place two identical transparent beakers side-by-side on a lab bench.
2. Fill both beakers with equal volumes of colorless aqueous hydrogen peroxide solution.
3. Add solid or aqueous potassium iodide only to the left beaker.
4. Gently shake both beakers simultaneously for ~1 second.
Observation of Experimental Phenomena
- Left beaker: immediate onset of continuous bubbling/foaming after addition and shaking; liquid remains colorless and transparent.
- Right beaker: no bubbling, foaming, or effervescence at any time; liquid remains still and unchanged.
Summary of Experimental Principles
Iodide ions catalyze the decomposition of hydrogen peroxide into water and oxygen gas; oxygen evolution causes visible bubbling only where catalyst is present.

Prompt Grounding rubric:
level_1: No two transparent beakers present; or no hydrogen peroxide visible in either beaker; or potassium iodide not shown as a solid or aqueous solution; or left/right spatial labeling absent and beakers not side-by-side; or no addition action to left beaker; or no stillness/unchanged state shown for right beaker.
level_2: Two beakers present and side-by-side, both containing colorless liquid, but potassium iodide is added to the wrong beaker (right instead of left), or added to both, or no addition action occurs at all; or beakers are not both transparent; or one beaker is missing its liquid content.
level_3: Two transparent beakers placed side-by-side, each containing a colorless liquid; potassium iodide is visibly added only to the left beaker; the right beaker remains unaltered with no addition; all objects match types and spatial arrangement specified in prompt.
level_4: All conditions for score 3 satisfied, AND the addition action is clearly directed toward the left beaker (e.g., hand or dropper enters frame above left beaker and releases material into it), AND the right beaker shows no contact, motion toward, or visual indication of intervention.
level_5: All conditions for score 4 satisfied, AND the left beaker receives potassium iodide while the right beaker remains completely static and visually identical before/during/after addition (no motion, no shadow shift, no reflection change, no parallax disturbance), confirming strict adherence to the posted_prompt without any extraneous or ambiguous elements.

Scientific and Causal Correctness rubric:
level_1: No observable phenomenon difference between beakers; or both beakers show vigorous bubbling; or neither shows any change; or left beaker shows color change, precipitation, or opacity; or right beaker shows bubbling or foam; or bubbling appears before addition.
level_2: Bubbling appears in only one beaker but in the wrong one (right); or bubbling appears simultaneously in both beakers; or bubbling starts before potassium iodide addition; or bubbling is present but no liquid remains visibly colorless in both beakers pre-addition.
level_3: Left beaker shows continuous bubbling/foaming after addition; right beaker shows no bubbling/foaming at any time; both liquids remain colorless and transparent throughout; no color change, phase separation, or opacity in either beaker.
level_4: All conditions for score 3 satisfied, AND bubbling in left beaker begins only after potassium iodide addition is completed (i.e., no bubbling during or before addition motion), AND right beaker maintains absolute stillness of liquid surface with no rising bubbles, foam, or effervescence at any frame.
level_5: All conditions for score 4 satisfied, AND bubbling in left beaker is exclusively confined to that beaker with no spillover, splash, or shared foam bridge to right beaker; AND liquid levels remain stable (no overflow or volume loss visible); AND no transient artifacts (e.g., air bubbles from pouring, dust, or condensation) mimic or obscure the catalytic bubbling phenomenon.

Spatiotemporal Consistency rubric:
level_1: Beakers teleport between frames; or sudden size/shape distortion occurs; or lighting changes abruptly (e.g., flash, flicker, shadow jump); or container structure breaks (e.g., beaker rim disappears, base detaches); or liquid surface discontinuously jumps (e.g., instant height change without motion).
level_2: Minor structural inconsistency: e.g., beaker base shifts laterally between frames without motion cause; or liquid surface ripples appear/disappear without corresponding motion; or shadow position mismatches light source direction across frames; or one beaker rotates while other stays fixed.
level_3: Both beakers maintain fixed relative positions side-by-side throughout; no object vanishes or reappears; liquid surfaces move continuously during shaking and settle smoothly; no abrupt lighting shifts, warping, or geometric distortion; all motion is physically plausible (e.g., gentle shaking produces damped oscillation, not rigid translation).
level_4: All conditions for score 3 satisfied, AND shaking motion is applied identically to both beakers (same timing, same direction, same amplitude range), AND post-shake settling is continuous and symmetrical (no asymmetric sloshing freeze or premature stabilization in one beaker).
level_5: All conditions for score 4 satisfied, AND no inter-frame temporal aliasing (e.g., no strobing, no skipped motion phases), AND no parallax inconsistency between beakers (e.g., consistent occlusion relationship, no floating foreground/background swap), AND camera viewpoint remains absolutely fixed (no pan, tilt, zoom, or focus shift), preserving spatial integrity across entire video.