Final answer:
No label is required for a decanted chemical if it is for personal use and will be used up by the end of the work shift, but lab safety and specific workplace regulations must always be followed.
Step-by-step explanation:
The question is addressing a situation typically found in a laboratory environment where chemicals are decanted, which means poured from one container to another. According to regulations that govern the labeling of chemicals in the workplace, if a decanted chemical is for personal use and will be used up by the end of the work shift, a workplace label usually is not required. This is because the substance is not being stored for an extended period. However, it is crucial to always follow the specific guidelines provided by one's workplace or jurisdiction, as regulations can vary.
Moreover, lab safety is paramount, and as such, you are responsible for your own safety and the safety of others when handling chemicals. It is essential not to eat or drink in the lab to prevent contamination, and always use proper lab glassware for its intended purpose.
Regarding the unused commercial chemical products in waste, it is essential to handle and label these accor-ding to the regulations that apply to waste management within the lab setting.