尿素尿素从外观上看为白色或半透明的颗粒状物质，而且颗粒均匀。它易溶于水，吸湿性小，抓一把在手里基本不粘手，打开袋子有氨味。在灼烧反应中，放在烧红的铁片或瓦上，尿素样品应迅速溶化，冒出白烟，并有刺鼻氨味产生。若样品经烧灼，冒出气泡并伴有微小火焰，可判定尿素 Urea urea from the appearance of white or translucent granular material, and uniform particles. It is soluble in water, hygroscopicity is small, grab a hand in the basic non-stick hand, open the bag with ammonia taste. In the burning reaction, on the burning red iron or tile, urea samples should be rapidly dissolved, white smoke, and a pungent smell of ammonia generated. If the sample is burned, bubble and accompanied by a small flame, can determine the urea