在初中化学学习中,同学们对计算题往往较难掌握,尤其是对涉及物质组成复杂、多种反应的题型,难以入手,即使能解,过程也常复杂化。如果将概念切换,则可化难为易,轻松解题。现就如何运用概念切换方式解答一些复杂题型进行解析。例1t°c时,将180g硫酸铜饱和溶液加热蒸发掉25g水后, In chemistry study in junior high school, students are often difficult to grasp on calculation problems, especially for questions involving complex and multiple reactions of materials, and it is difficult to get started. Even if they are solvable, the process is often complicated. If you switch concepts, you can make things easier and easier to solve. Now how to use the concept of switching to answer some complex questions for analysis. Example 1t°c, after heating 180g of saturated copper sulfate solution to evaporate 25g of water,