Domain: Chemistry / ball_stick_model

turn: 1
modality: image
input: Please generate a concise chemical laboratory bench scene: A <correct and appropriate laboratory container type> contains a substance. This substance must exhibit the following observable characteristics: <color + physical state (solid/liquid/gas) + form (powder/crystalline/lump/solution, etc.) + optional luster/transparency; the name, chemical formula, or element symbols of the substance must NOT appear>. The background should be a <laboratory environment: bench surface with outlines of basic equipment, avoid clutter and text labels>.
output: evaluation_points: 1. The generated container is correct and is indeed a <gas collection bottle or gas jar>.

2. The color and appearance (form) of the target substance conform to 'colorless, gaseous state'.

3. The substance is contained in the bottle in a correct manner, with the bottle mouth sealed appropriately (e.g., with a glass plate or stopper), and the amount of gas is visually suggested as filling the container.

4. The background is a simple laboratory bench scene.

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 is a colorless gas at room temperature and pressure. 2) It has a slightly sweet odor. 3) It is highly flammable and burns with a luminous, smoky flame in air. Please select from the following options the substance it most likely is:

A. Carbon Dioxide (CO₂)
B. Oxygen (O₂)
C. Ethylene (C₂H₄)
D. Ammonia (NH₃)
E. None of the above
output: answer: C

turn: 3
modality: image
input: Please generate a ball-and-stick model of the molecular structure of the 'target substance' determined in the first half. The background must be white, with no text labels or annotations. Please adhere to the following atomic color scheme: H-white, C-black, O-red, N-blue, Cl-green, S-yellow, P-orange. For any elements not listed, use a neutral gray and maintain consistency.
output: evaluation_points: 1. Correct atom types and counts (consistent with the real molecular composition of the target substance, C₂H₄, with no extra or missing atoms).

2. Correct bonding connectivity (key bond connections and branch connections are accurate, with an overall self-consistent structure).

3. Correct key spatial configuration (consistent with the common/stable configuration of the target substance; the planar geometry should be discernible).

4. Atomic coloring strictly follows the color mapping table provided in the prompt and is consistent throughout the image (the same element should not appear in multiple colors).

5. Output is a clear ball-and-stick model: reasonable proportion between spheres and sticks, structure is not overcrowded, background is pure white.

turn: 4
modality: image
input: Based on the ball-and-stick model generated in the previous turn, please modify the molecular structure once according to the following rule and generate the modified ball-and-stick model: <Structural modification rule: Perform an addition reaction on the carbon-carbon double bond, converting it into a single bond and adding a hydrogen atom (H) to each of the two carbon atoms originally involved in the double bond. Do not directly or indirectly mention the substance name>. Except for the local area involved in the modification, the rest of the structure should remain consistent with the input structure. The atomic color scheme from the previous question's <color mapping table> should be used. The background is white, with no text labels.
output: evaluation_points: 1. The modification action is correct (strictly conforms to 'Perform an addition reaction on the carbon-carbon double bond...', no wrong type of modification like substitution or elimination).

2. The modification site is unique and correct (targets the specified 'carbon-carbon double bond' as the only site, with no substitution at other positions).

3. The atom count and bond connectivity after modification are self-consistent (no valence errors, dangling bonds, extra bonds, or missing bonds).

4. The unmodified structural parts remain consistent (skeletal topology and main configuration are the same as the input; overall rotation/viewpoint changes are allowed but connection relationships must not change).

The unmodified structural parts remain consistent (skeletal topology and main configuration are the same as the ball-and-stick model generated in turn 3; overall rotation/viewpoint changes are allowed but connection relationships must not change).

Atomic coloring strictly follows the color mapping table provided in turn 3's prompt (H-white, C-black, O-red, N-blue, Cl-green, S-yellow, P-orange, others neutral gray); newly added atoms also adhere to this scheme.