Question

all chemicals are to be considered dangerous. true false question 18 1 pts return all unused chemicals to their original containers. true false question 19 1 pts work areas should be kept clean and tidy. true false

Explanation:

• For the statement "All chemicals are to be considered dangerous", in a laboratory or chemical - handling context, it is a safety principle to assume all chemicals are dangerous until proven otherwise. This is to ensure proper handling, storage, and safety precautions.
• For the statement "Return all unused chemicals to their original containers", this is generally false. Unused chemicals may have been contaminated (e.g., if a spatula was used to take some out and then put back), and returning them can contaminate the entire container.
• For the statement "Work areas should be kept clean and tidy", this is a basic safety and efficiency principle in any workspace, especially in a laboratory where spills, tripping hazards, or mis - identification of chemicals can occur in a cluttered area.

Answer:

• First question: True
• Second question: False
• Third question: True