Individuals in most countries can get first aid training through courses offered by community health organizations and hospitals. Training may last anywhere from a few hours to three or four days, depending on the scope of a program.
Manganese is a pinkinsh-gray, chemically active element. It is a hard metal and is very brittle. It is hard to melt, but easily oxidized. Manganese is reactive when pure, and as a powder it will burn in oxygen, it reacts with water (it rusts like iron) and dissolves in dilute acids.Applications. Manganese is essential to iron and steel production. At present steel making accounts 85% to 90% of the total demand, most of the total demand.anganese is reactive when pure, and as a powder it will burn in oxygen, it reacts with water (it rusts like iron) and dissolves in dilute acids. Applications. Manganese is essential to iron and steel production. At present steel making accounts 85% to 90% of the total demand, most of the total demand.
* MnO2 is used in combination with anthracite, sand, and gravel in industrial water treatment plants. * Manganese dioxide also catalyses the decomposition of hydrogen peroxide to oxygen and water: 2 H2O2(aq) â O2(g) + 2 H2O(l) * Eighteenth-century British chemists referred to MnO2 simply as manganese.Elemental manganese was known as regulus of manganese. * Ancient cave painters used MnO2 as a black or brown pigment. MnO2 was used for production of chlorine in the eighteenth century, before being displaced by electrolytic methods. The manganese dioxide was subsequently recovered by the Weldon process. * Earliest glassmakers used MnO2 to remove the natural bluish-green tint of glass, or to add a pinkish or purplish color.