Which of the following can be considered a chemical hazard?

A chemical hazard refers to the potential for harm caused by substances that can pose danger when ingested or come into contact with food. Chemicals not intended for consumption, such as cleaning agents, pesticides, or industrial chemicals, fit this definition perfectly as they can contaminate food and lead to serious health issues if they enter the food supply.

Food additives, while they are chemicals, are specifically designed to be used in food products and are regulated for safe consumption, making them less of a hazard when used properly. Glass pieces, on the other hand, are considered a physical hazard rather than a chemical one because they can cause injury or choking rather than chemical contamination. Lastly, dirty utensils might introduce biological hazards like bacteria but do not relate to chemical hazards. Thus, chemicals not intended for consumption are classified as a chemical hazard due to their potential to cause harm if ingested.