What should be avoided to promote safety in handling chemicals?

Mixing different chemicals freely is crucial to avoid, as it can lead to dangerous reactions, including toxic gas release, explosions, or other hazardous situations. Many substances, when combined, may create unforeseen and harmful chemical interactions that can pose serious health risks to individuals in the vicinity. Safety protocols emphasize the importance of understanding the properties of chemicals and ensuring they are handled properly, including knowing which can and cannot be mixed. This ensures not only personal safety but also the safety of others in the environment. The other options, such as labeling containers clearly, using appropriate storage, and maintaining a clean workspace, are all essential practices that enhance safety and prevent accidents in handling chemicals.