Final answer:
Employees must receive information and training on hazardous chemicals before starting work with them and when any hazards change, in accordance with OSHA standards.
Step-by-step explanation:
Employees working with hazardous chemicals must be provided information and training on those chemicals prior to initial assignment to work with a hazardous chemical and whenever the hazard changes. This ensures employees are fully informed of the risks and the correct handling procedures to maintain safety in the workplace. It's mandatory by Occupational Health and Safety Administration (OSHA) standards for employers to provide effective training that helps prevent workplace accidents, injuries and illnesses.