VOA-Sparrow Clinic The VOA-Sparrow Clinic is a collaboration between Volunteers of America and Sparrow Hospital, providing both physical and mental health care to the homeless in the Lansing area. Their location is 430 N Larch in Lansing.
Answers. Best Answer: Proposed to be an element by Carl Wilhelm Scheele in 1774, manganese was discovered by Johan Gottlieb Gahn, a Swedish chemist, by heating the mineral pyrolusite (MnO2) in the presence of charcoal later that year.
* 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.