2al+2H2O+2NaOH = = 2nalo2+3H2 (gas)
Aluminum is a metallic element with the symbol Al, which is a silvery white light metal. It has plasticity. Commodities are often made into bars, sheets, foils, powders, tapes and wires. An oxide film can be formed in humid air to prevent metal corrosion. Aluminum powder can burn violently when heated in air, and give off a dazzling white flame. Soluble in dilute sulfuric acid, nitric acid, hydrochloric acid, sodium hydroxide and potassium hydroxide solution, insoluble in water. The relative density is 2.70.
Basic physical properties
Aluminum is a silvery white light metal. It has plasticity. Commodities are often made into columns, rods, sheets, foils, powders, ribbons and filaments. An oxide film can be formed in humid air to prevent metal corrosion. Aluminum powder treated with acid will burn violently when heated in air, giving off a dazzling white flame. Soluble in dilute sulfuric acid, dilute nitric acid, hydrochloric acid, sodium hydroxide and potassium hydroxide solution, insoluble in water, but can slowly react with hot water to generate aluminum hydroxide, with a relative density of 2.70, an elastic modulus of 70Gpa and a Poisson's ratio of 0.33.
The melting point is 660℃. The boiling point is 2327℃. It is widely used because of its light weight, good electrical and thermal conductivity, high reflectivity and oxidation resistance. Aluminum used in daily utensils is usually called "steel refined" or "steel grade". The thermal expansion coefficient of al at (room temperature) 25℃ is 0.0000236mm/℃, that is, 23.6ppm*k- 1.