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将一束擦亮的细铜丝绕在一根直径1～1.5mm铜丝的前端,再将另一端在玻璃棒上绕成螺旋状备用。把盛两角匙硫粉的试管垂直向上,固定在铁架台上,用酒精灯加热,待试管中红棕色的硫蒸气,升高到2～3厘米时,向试管中插入螺旋状铜丝(注意:铜丝不能预热),即能明显地看到铜丝发红光。取出螺旋状的反应产物,既可观察到硫化亚铜呈黑色,性脆;又可以观察到硫化亚铜包裹着的铜丝芯子来反应。 如果以上反应后的试管中撒入铜粉,可看到反应剧烈,红色火焰高度接近试管口。可反复多次,以利学生观察。
A polished fine copper wire is wound around the front end of a copper wire with a diameter of 1 to 1.5 mm, and the other end is spirally wound on a glass rod for use. Hold the test tube containing two powdered sulfur powders vertically upwards, fix it on a metal stand, and heat it with an alcohol lamp. When the red-brown sulfur vapor in the test tube rises to 2 to 3 cm, insert a spiral copper wire into the test tube ( Note: The copper wire can not be preheated, that is, the copper wire can be clearly seen red light. The spiral reaction product was taken out, and it was observed that the cuprous sulfide was black and brittle, and copper sulfide cores coated with cuprous sulfide were observed for reaction. If the copper powder is thrown into the test tube after the above reaction, the reaction is seen to be intense and the red flame height is close to the test tube mouth. Can be repeated several times to facilitate student observation.