If 0.45g sample of mineral ore is anlysed from chromium and found to contain 0.560mg Cr2O3 express the concentration of Cr2O3 in the sample A) percent (%) B) parts per thousand (PPT) C) parts per million (ppm) D) parts per billion (ppb)

Asubstance is held in an open container. its particles move past one another at random speeds but do not leave the container. heat is removed from the system, and the particles slow down. when enough heat is removed, the particles no longer have enough speed to overcome the weak attractive forces between them. when this happens, the substance enters its solid state. the process described above is known as .