3. what are these phenomena (physical or chemical): a) melting magnesium; b) burning magnesium; c) the dissolution of magnesium in sulfuric acid; d) melting of sulfur; e) burning of sulfur; e) evaporation of alcohol; g) burning alcohol; h) the conversion of chalk into powder?

katerinatumasjp02dx5    2   27.06.2019 07:59    2