The Workplace Hazardous Materials Information System (WHMIS) is a Canada-wide system designed to give employers and workers information about hazardous materials used in the workplace. Under WHMIS, there are three ways in which information on hazardous materials is to be provided. A WHMIS certification is a requirement in many workplaces dealing with chemicals. Science Teachers are also required to be certified in WHMIS. This quiz is a great way to practice the WHMIS symbols.