Chemical knowledge in ancient books and records

A. "When sulfuric acid is boiled in an iron pan, it will turn into copper after a long time", and a displacement reaction occurred in this process.

B "A Gu Jian" takes special steel as the blade and iron as the stem. "Agent steel" refers to ferroalloy.

C "Meng Qian Bi Tan" contains: "Fat water is produced in Gaonu County, burning like hemp, but the smoke is very thick", and "fat water" belongs to petroleum.

Analysis:

A. replacing copper with iron belongs to wet copper smelting, and displacement reaction occurred in this process, so a is correct.

B. The blade is hard, so carbon-iron alloy is used, so B is correct.

C. It burns like hemp, but the smoke is very thick, which means it is easy to burn. It should be oil, so C is right.

brief introduction

Chemistry emphasizes that while mastering the basic knowledge, we must never lose points in details. Some students are not rigorous enough in their studies, and they are often careless about some error-prone problems, which leads to the failure of their grades.

It is not that these students study poorly, but that some knowledge points are not clearly remembered. As long as they master the knowledge gap and sum up the scattered knowledge points, it is easy to get high marks.