Domain: Chemistry / apparatus_usage

turn: 1
modality: text
input: Which of the following substances are consistent with the description: 'A reddish-brown solid at room temperature, insoluble in water, and exhibiting magnetic properties'?

Options:
A. Copper(II) oxide (CuO)
B. Iron(III) oxide (Fe2O3)
C. Sodium chloride (NaCl)
D. Sulfur powder (S)
E. Potassium permanganate (KMnO4)
F. Aluminum oxide (Al2O3)
G. None of the above
output: answer: B

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 additional condition: 'This substance is commonly used as a pigment and catalyst, and it reacts with dilute hydrochloric acid to produce a yellow solution.' 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 wide-mouth glass reagent bottle with a ground glass stopper.

The substance generated is indeed Iron(III) oxide (Fe2O3), with a color and appearance (fine powder) consistent with the description from Turn 1: 'reddish-brown solid'.

3. The substance is appropriately contained in the bottle (filled to a suitable level, not overflowing), with the bottle clearly labeled.

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'. The thermal decomposition of iron(II) sulfate heptahydrate (FeSO4·7H2O) to produce this target substance requires the use of a laboratory instrument: the crucible. Please generate an image depicting the correct use of this instrument during this reaction. The background is a clean laboratory bench.
output: evaluation_points: 1. The image correctly depicts a porcelain crucible, placed on a clay triangle which is itself supported by an iron ring attached to a retort stand.

The reaction setup and conditions are consistent with the described 'thermal decomposition of iron(II) sulfate heptahydrate' from Turn 3 input. The crucible should contain a green solid (hydrated FeSO4) initially, with a Bunsen burner providing heat from below.

3. The crucible is used correctly: it is clean, dry, and heated gradually. Crucible tongs should be shown nearby for handling the hot crucible, adhering to safety standards.

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

turn: 4
modality: text
input: Based on the instrument and operational scene in the input image, determine which of the following statements about this instrument and its usage specifications are correct:

Options:
A. Porcelain crucibles can be heated directly to very high temperatures using a Bunsen burner.
B. A desiccator is the primary instrument used for the thermal decomposition of hydrated salts.
C. Crucible tongs should be used to handle a hot crucible, not standard beaker tongs.
D. When heating a substance in a crucible, the lid should always be kept tightly sealed to prevent oxidation.
E. After heating, a crucible should be placed directly on the laboratory bench to cool.
F. A clay triangle is used to support the crucible during heating, allowing flame contact with the bottom.
G. None of the above
output: answer: A, C, F