Domain: Chemistry / precipitation

turn: 1
modality: image
input: Generate a concise chemical laboratory bench scene: A <correct and appropriate laboratory container type> contains a substance. This substance must have the following observable appearance: <must include color + physical state (solid/liquid/gas) + form (powder/lump/crystal/solution, etc.) + optional luster/transparency; the name, chemical formula, or element symbols of the substance are prohibited>. The background should be a <laboratory environment: bench surface, outlines of basic equipment, avoid clutter and text labels>.
output: evaluation_points: 1. The container generated in the image is correct and is indeed a <sealed, dry, wide-mouth reagent bottle>.

2. The color and appearance (powder/crystal/lump/solution, etc.) of the target substance conform to '<pale yellow, solid, fine powder>'. It should not be white, liquid, or crystalline.

3. The substance is correctly contained in the bottle, which should be sealed to prevent contact with atmospheric moisture. The filling amount is appropriate (e.g., half to two-thirds full).

4. The background is a simple laboratory bench scene with a clean surface and minimal, generic equipment outlines.

turn: 2
modality: text
input: Based on the appearance of the substance in the input image, and given that this substance is known to have the following properties: (1) It reacts vigorously with water, releasing a gas and generating heat. (2) It is a strong oxidizing agent. (3) It is commonly used as a bleaching agent and in oxygen generation. Which of the following substances is it most likely to be?

Options:
A. Sodium chloride (NaCl)
B. Calcium oxide (CaO)
C. Sodium peroxide (Na2O2)
D. Potassium permanganate (KMnO4)
E. None of the above
output: answer: C

turn: 3
modality: text
input: We refer to the substance you identified in the previous context as the 'target substance'. Which of the following reagents, when added dropwise to a solution prepared from the target substance, will produce a precipitate with the following characteristics: <white, gelatinous (amorphous)>?

Options:
A. Dilute hydrochloric acid (HCl)
B. Barium chloride solution (BaCl2)
C. Silver nitrate solution (AgNO3)
D. Sodium hydroxide solution (NaOH)
E. None of the above
output: answer: B

turn: 4
modality: image
input: Generate a test tube containing an appropriate amount of solution prepared from the target substance. The scene should depict the state after adding an excess of the reagent you selected in the previous round, until no more precipitate forms. The background is a simple laboratory bench.
output: evaluation_points: 1. The test tube and liquid volume are reasonable, with the liquid level at approximately one-third of the tube's height.

2. The color of the precipitate satisfies '<white>'. It should not be colored.

3. The state of the precipitate satisfies '<gelatinous/amorphous mass settled at the bottom>'. It should not be crystalline or powdery.

4. The solution color is reasonable. After adding excess <barium chloride solution> to the <sodium peroxide solution (which would first react with water to form sodium hydroxide and hydrogen peroxide, and the peroxide may decompose)> and the precipitation reaction is complete, the supernatant solution should appear <colorless and clear>. The solution should not be cloudy or colored.

The image background is a simple laboratory bench, consistent with the background in the image generated in turn 1.