1. The person who found oxygen is called Scheler. He is a famous chemist in Sweden. 1742 65438+February 19 was born in larcon, Sweden. His family is poor. /kloc-when he was 0/3 years old, he worked as an apprentice in a pharmacy in Gothenburg and taught himself chemistry in his spare time. Later, he worked as a pharmacist in pharmacies in Malmo, Stockholm and Uppsala. During this period, he worked with another young chemist to extract tartaric acid from tartar, and wrote two papers, which were sent to the Swedish Academy Science Award. Because he is an ordinary pharmacist, the Swedish Academy of Science looked down on it and didn't publish it. There is no doubt that this is a great blow to the young Scheler. But he didn't lose heart and studied harder. After numerous experiments, he finally discovered oxygen in 1773 and wrote a book about air and fire. 1774, he discovered chlorine again, which was confirmed by British chemist David, and strengthened his confidence in learning chemistry. 1775, in order to better engage in research work, Scheler quit his job as a pharmacist and opened his own pharmacy in Keping town. Although he received some invitations from Berlin and England, he never left the city. Here, he devoted himself to chemical research, and successively discovered fluorine, ammonia, hydrogen chloride, hydrofluoric acid, tungstic acid, molybdic acid and arsenic acid, making great contributions in many aspects of chemistry. He was elected as a member of the Academy of Sciences of the Royal Swedish Academy. Nobel invented the telephone. He works hard in the laboratory with his assistant Watson every day. They were preparing for the experiment that day, and Bell ran upstairs to check it out. As a result, he accidentally knocked over the chemicals in the laboratory and his clothes caught fire. He shouted anxiously, "Watson, come and save me!" " "It was this cry for help that reached Watson through the wire, which was the first sound people heard through the wire. Watson ran upstairs and shouted excitedly, "We made it! Archimedes discovered the story of buoyancy in the bathtub. In an experiment, Li Dezhanger accidentally knocked off a bag of sulfur and fell directly into the pot where rubber was being boiled, so he prepared a kind of wear-resistant and durable rubber, such as the current wheel ~