一、关于混和物的实验初中化学铁粉与硫粉混合的演示实验，我做了如下小改进：将少量铁粉与硫粉的混合物放入一大试管中，做演示时，拿起试管面向学生。然后在试管外壁放一磁铁，即可看到铁粉在试管中随着磁铁有序地排列。从而使学生理解混和物中物质各保持自己的性质，它... First, on the experiment of mixed materials The demonstration experiment of the mixing of chemical iron powder and sulfur powder in junior high school, I made the following small improvements: Put a small amount of mixture of iron powder and sulfur powder into a big test tube. When doing the demonstration, pick up the test tube facing student. Then place a magnet on the outside of the test tube to see that the iron powder is arranged in the test tube along with the magnets. So that the students understand that the substances in the blend keep their own properties, it...