Domain: Chemistry / apparatus_usage

turn: 1
modality: text
input: Which of the following substances are consistent with the description: 'A black or dark brown solid powder, insoluble in water, commonly used as a catalyst in laboratory reactions such as the decomposition of hydrogen peroxide'?
Options:
A. Iron(III) oxide (Fe2O3)
B. Copper(II) oxide (CuO)
C. Manganese dioxide (MnO2)
D. Activated charcoal (C)
E. Sodium chloride (NaCl)
F. Calcium carbonate (CaCO3)
G. None of the above
output: answer: B, C

turn: 2
modality: image
input: It is known that the target substance is one of the correct options from the previous question and satisfies the following additional condition: 'This substance is a common oxidizing agent and catalyst, and must be stored in a sealed container to prevent moisture absorption and contamination.' 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 in the image is correct: a sealed, wide-mouth glass reagent bottle with a ground glass stopper or a plastic screw-cap bottle.

2. The substance generated is indeed manganese dioxide (MnO2), appearing as a fine, dark brown to black powder, consistent with the description in turn 1: 'A black or dark brown solid powder, insoluble in water, commonly used as a catalyst in laboratory reactions such as the decomposition of hydrogen peroxide'.

3. The powder is contained within the sealed bottle, filled to an appropriate level (e.g., 1/2 to 2/3 of the bottle's volume). There is no special liquid medium like kerosene, as it is stored dry.

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

turn: 3
modality: image
input: We will subsequently refer to the substance you identified earlier as the 'target substance'. In the laboratory preparation of oxygen gas via the catalytic decomposition of hydrogen peroxide, the experimental apparatus 'gas collection bottle' is used. Please generate an image depicting the correct use of this apparatus in that reaction scenario. The background is a simple laboratory bench.
output: evaluation_points: 1. The image correctly depicts the gas collection bottle (e.g., a gas jar or a wide-mouth bottle) placed in a water trough or basin, filled with water and inverted.

2. The reaction shown involves the catalytic decomposition of a dilute hydrogen peroxide solution (e.g., 3% H2O2) using the black powdered target substance (MnO2) as a catalyst in a conical flask or test tube, with oxygen gas being produced and collected. The target substance (MnO2) should appear as a fine, dark brown to black powder, consistent with the description in turn 1.

3. The use of the gas collection bottle conforms to standard practice: it is initially full of water and inverted in the water trough; the delivery tube from the reaction vessel is positioned under the mouth of the bottle to allow oxygen bubbles to displace the water.

4. The background is a clean, uncluttered laboratory bench scene, consistent with the background requirement in the current turn's input text.

turn: 4
modality: text
input: Based on the instrument and operational scene in the input image, judge which of the following statements about this instrument and its usage norms are correct:
Options:
A. This apparatus is primarily used for collecting gases that are denser than air.
B. When collecting a gas like oxygen, the bottle should initially be completely filled with water and then inverted in a water trough.
C. The delivery tube from the reaction vessel should be inserted directly into the mouth of the inverted bottle before gas production begins.
D. This method of gas collection is suitable for gases that are highly soluble in water.
E. After collection, the bottle can be removed from the water and stored upright with its open mouth covered by a glass plate.
F. This apparatus is also commonly called a 'graduated cylinder'.
G. None of the above
output: answer: B, E