Domain: Chemistry / lab_accident

turn: 1
modality: text
input: Which of the following substances are characterized by being a greenish-yellow, pungent-smelling, toxic gas at room temperature and pressure, and is denser than air?

A. Sulfur dioxide (SO₂)
B. Ammonia (NH₃)
C. Chlorine gas (Cl₂)
D. Carbon dioxide (CO₂)
E. Hydrogen (H₂)
F. Nitrogen dioxide (NO₂)
G. None of the above
output: answer: C, F

turn: 2
modality: image
input: The target substance is one of the correct options from the previous question. It is a toxic gas that must be stored in a sealed container under positive pressure to prevent air ingress. Please generate an image showing this target substance stored correctly in its proper container and placed on a laboratory bench.
output: evaluation_points: 1. The container generated is correct: a green steel gas cylinder with a brass valve, clearly labeled with hazard symbols (skull and crossbones, corrosive symbol).

2. The substance represented is chlorine gas (Cl₂), consistent with its gaseous state. The cylinder's color is green.

3. The gas cylinder is shown upright, securely fastened to the bench with a chain or clamp, with the valve closed and capped. The storage method is appropriate for a pressurized toxic gas.

4. The background is a clean, uncluttered laboratory bench scene.

turn: 3
modality: image
input: We will refer to the substance you identified previously as the 'target substance'. The target substance can react with a colorless, aqueous solution of sodium bromide (NaBr) to produce a distinct color change. Please generate the state of the laboratory bench during this normal reaction, with experimental apparatus, material states, and reaction phenomena all being reasonable and self-consistent.
output: evaluation_points: 1. The experimental setup is correct: A gas washing bottle or a flask with an inlet tube is used to bubble the target gas (Cl₂) through a solution of sodium bromide (NaBr) in a beaker or test tube.

2. The target substance, chlorine gas (Cl₂), is depicted as a greenish-yellow gas entering the apparatus via tubing from a gas cylinder (partially shown).

3. The reactant, sodium bromide (NaBr) solution, is shown as a colorless, clear liquid in the receiving vessel (beaker/test tube).

4. The reaction phenomenon is correct: The colorless NaBr solution has turned orange-brown due to the formation of bromine (Br₂) from the displacement reaction: Cl₂(g) + 2NaBr(aq) → 2NaCl(aq) + Br₂(aq).

5. The picture background is a laboratory bench.

turn: 4
modality: text
input: If, in the normal reaction described above, the sodium bromide (NaBr) solution were mistakenly replaced with a concentrated aqueous ammonia (NH₃) solution, the most likely accident to occur is:

A. A violent explosion due to rapid gas release.
B. The formation of toxic, white fumes of ammonium chloride (NH₄Cl).
C. A vigorous, exothermic reaction producing a flammable gas.
D. No visible reaction would occur.
E. None of the above.
output: answer: B

turn: 5
modality: image
input: Please generate the scene of the experimental accident described in the previous question, and demonstrate the correct way to handle this accident.
output: evaluation_points: 1. The image correctly shows the accident aftermath: Dense white fumes of ammonium chloride (NH₄Cl) are billowing from the reaction vessel where chlorine gas (inlet tube) meets concentrated ammonia solution.

2. The image shows the correct accident handling method: A researcher (wearing appropriate PPE like gloves, goggles, and a lab coat) is using a fume hood sash to contain the fumes or is actively ventilating the area, and is preparing to dilute the reactants with water to mitigate further fume production.

3. The background and other unrelated elements remain consistent with the reaction image generated earlier (same bench, similar apparatus setup).

3. The background and other unrelated elements (e.g., laboratory bench) remain consistent with the image generated in turn 2.