Final answer:
Safety precautions for handling substances that vaporize or burn in oxygen are not clearly defined by a specific chapter in AFMAN 91-203 but emphasize the importance of being alert and careful. The NFPA hazard diamond and proper lab procedures, such as turning off Bunsen burners and sealing containers, are critical.
Step-by-step explanation:
The chapter in AFMAN 91-203 that covers safety precautions when handling substances that vaporize or burn in the presence of oxygen is not explicitly stated in the provided information. However, the instructions emphasize the importance of being alert and careful when handling chemicals.
They also mention the National Fire Protection Agency (NFPA) hazard diamond, which is used to summarize the major hazards of a chemical substance, including flammability. When handling flammable chemicals, it is essential to follow instructions carefully to avoid exposure to flames or other heat sources unless specifically instructed by a teacher or a responsible authority.
This includes ensuring that all Bunsen burners are turned off and all chemical containers are sealed after practical experiments. It is also important to understand the reactions and products of chemical substances with oxygen, as highlighted by the prediction of the product when burning francium in air, and describing the reactions of water with potassium and potassium oxide using equations.