For the majority of minerals, the streak obtained when the mineral is scratched against a porcelain plate is a. only useful if the mineral is softer than the porcelain streak plate. b. always dark brown or black. c. always diagnostic of that mineral. d. not useful, because the porcelain will often chemically react with the mineral.

Given that the molar mass of nano3  is 85.00  g/mol, what mass of nano3  is needed to make 4.50  l of a 1.50  m nano3solution? use  .6.75 g18.9 g255 g574 g

What must happen before a body cell can begin mitotic cell division

Which statements are true concerning mineral formation? check all that apply. the slower the cooling, the larger the crystals. the faster the cooling, the smaller the crystals. crystals formed from magma are smaller than crystals formed from lava. minerals can only form in solutions when the solution is heated deep underground. when a solution cools, elements and compounds leave the solution and crystallize as minerals. minerals formed from hot water solutions can form narrow channels in the surrounding rock.