In the early morning of March 1 1, 2009, a branch of China Railway Group, which built the Shanghai-Nanjing intercity railway, rented a laborer's room in Danyang City, Jiangsu Province.

(1) aluminum powder is often used as paint, which makes use of the physical properties of aluminum, so the answer to this question is: physics;

(2) Dry aluminum powder is easy to explode when it meets an open flame in the air, which is caused by the burning of aluminum powder, so the answer to this question is: 4Al+3O2? Light it? . ? 2Al2O3

(3) According to the information provided by the stem, we can know that aluminum powder should be stored in a dry and ventilated warehouse, away from kindling and heat sources, so the answer to this question is: d;

(4) aluminum powder and iron oxide powder are mixed and ignited according to a certain proportion to react to generate high-temperature molten iron. According to the law of conservation of mass, it can be inferred that another substance is alumina, so the answer to this question is: 2Al+Fe2O3? High temperature? . ? Al2O3+2Fe