题目

求大神写一篇制取氧气的英语作文

提问时间：2020-11-29

答案

One of the main group of oxygen,air,heavier than air,standard condition (0 DEG C and pressure of 101325 kPa) under the density of 1.429 g / l..A colorless,odorless,tasteless.The solubility in water is very small.The pressure is 101kPa,the oxygen to pale blue liquid at about -183 degrees Celsius,at about -218 degrees Celsius into snowflake light blue solid.Molecular oxygen is paramagnetic.
There are generally 3 kinds of methods for preparing oxygen.
Method:Potassium Permanganate heating decomposition or potassium chlorate,manganese dioxide heat
Method two:the decomposition of hydrogen peroxide
Method three:liquid air separation method