Question

use hand signals instead of verbal communication..
no food or drink is allowed.
no electronic equipment is allowed.
store all chemicals in a plastic bucket.
clean up after the experiment.
no horseplay is allowed.

Explanation:

Assuming the question is to identify the incorrect lab safety rule (since "Store all chemicals in a plastic bucket" is incorrect as different chemicals have specific storage requirements, and others are standard lab safety or general rules):

• "Use hand signals..." may be context - specific but not incorrect generally. "No food/drink", "No electronic equipment", "Clean up after experiment", "No horseplay" are standard lab safety. Storing all chemicals in a plastic bucket is wrong as some chemicals react with plastic or need specific containers.

Answer:

The incorrect rule is: Store all chemicals in a plastic bucket.