What information does the SDS composition section require for substances?

The correct answer focuses on the requirements of the Safety Data Sheet (SDS) composition section, which specifically mandates the disclosure of the chemical name and any synonyms used for the substance. This information is critical as it helps ensure that users can identify the chemicals they are handling, understand their potential hazards, and respond appropriately in case of an exposure or spill.

Chemical names and synonyms also facilitate communication about the substances across different databases and regulatory documents, thereby enhancing safety in handling and emergency response situations. This part of the SDS provides essential insights into the identity of the chemicals involved, allowing for informed decision-making regarding safety measures, storage, and usage.

While the other options may contain relevant information in different contexts, they do not represent the primary focus of the composition section. For instance, physical properties fall under a different section of the SDS, emphasizing the compound's characteristics rather than its identity. Similarly, environmental effects and trade uses, while important, are covered in their respective sections and are not part of the essential composition information required to understand the nature and risks associated with the substance.