Senior one chemistry is the basic stage of senior high school chemistry, which needs to be studied well. From the beginning, it was completely different from junior high school chemistry. Senior high school chemistry introduced the important physical concept of "quantity of matter" for the first time. The quantity of matter, Avogadro constant, and the quantity and concentration of matter need a lot of questions to consolidate understanding, because the whole three-year high school is based on this, and all calculations are inseparable from it.

Next, ion reaction and redox reaction are also the focus and difficulty of learning, and even occupy a large proportion in the college entrance examination. Special attention should be paid to the writing of example equations, which should be carried out step by step according to the steps of "writing, correcting, deleting and looking up". How to gain and lose electrons in redox reaction is the key point, and coefficient balance is also one of the contents that are often tested.

Several important metals are introduced in senior high school chemistry, among which aluminum, iron, sodium and their compounds are the key points, and they are also the key contents of senior one. Especially for aluminum, the valence change is very flexible, and the angle of examination questions is changeable. We must fully master it and make more summaries.

Senior high school chemistry also introduces several important nonmetals, with emphasis on carbon and nitrogen. Among them, carbon is one of the main components of organic matter, and nitrogen is also a very common element. There are still many compounds, such as the equations related to the transformation of ammonia, which need to be carefully remembered.

Having said that, in fact, the focus of high school chemistry is still on memorizing and doing problems. Come on! If it helps you, I hope you like it and give me encouragement ~