iron oxide is encountered in the laboratory as a black powder. it exhibits permanent magnetism and is ferrimagnetic, but is sometimes incorrectly described as ferromagnetic. its most extensive use is as a black pigment which is synthesised rather than being extracted from the naturally occurring mineral...
a: no. in july , an analysis of observational studies and clinical trials involving more than million people over an average of years concluded that multivitamin/mineral supplements do not reduce the risk of heart attacks, strokes, or cardiovascular deaths. the only apparent benefit from multivitamins...
substances hazardous to health how substances cause harm recognising hazardous substances safety data sheets risk assessment decide precautions prevent or adequately control exposure use and maintain control measures monitor exposure health surveillance plans and procedures to deal with accidents, incidents...
nicotine is more addictive than cannabis , caffeine , ethanol , cocaine , and heroin when considering both somatic and psychological dependence. however, due to the stronger withdrawal effects of ethanol , cocaine and heroin , nicotine may have a lower potential for somatic dependence than these substances...