Expired chemicals require extreme care, as they may lose their effectiveness, produce undesirable chemical reactions, or even become dangerous. It is not recommended to attempt to use these chemicals to synthesize other substances on your own, but here are a few things to note: 1. **Identify the type of chemical**: First, determine the type and characteristics of these chemicals. You can refer to the chemical's safety data sheet (SDS) to understand its composition, hazards, storage and handling recommendations. 2. **Safe disposal**: If the chemical is considered hazardous or unstable, the best way is to dispose of it in a professional manner. Contact your local environmental protection department or a professional waste chemical disposal company to ask if they can help dispose of these chemicals. 3. **Avoid mixing different chemicals**: Expired chemicals may become unstable, and different types of chemicals should not be mixed at will without understanding the chemical reactions to avoid unexpected chemical reactions. 4. **Protect yourself and the environment**: Make sure to use appropriate personal protective equipment (such as gloves, goggles and masks) in any case and work in a well-ventilated area. Synthetic chemistry is complex and risky, especially when it comes to expired or unfamiliar materials. If you want to conduct chemical experiments or synthesis, please be sure to do it under supervision and guidance, and follow all safety regulations and laws and regulations. If you are interested in chemistry, it is recommended to consult professionals or participate in formal chemical research projects.