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1.思考问题的顺序(1)围绕主要问题思考.例如:选择适当的实验路线、方法;所用药品、仪器简单易得;实验过程快速、安全、环保;实验现象明显.(2)思考有关物质的制备、净化、吸收和存放等有关问题.例如:制取二氧化碳并验证二氧化碳的化学性质时,因为制取的二氧化碳气体中常含有盐酸挥发出来的氯化氢气体和水蒸气,所以往往在验证性质装置前加接一个气体净化装置和一个干燥装置,以防止杂质气体和水蒸气影响实验结论.
1. Consider the sequence of questions (1) Think about the main issues. For example: choose the appropriate experimental route and method; the medicines and instruments used are easily accessible; the experimental process is fast, safe, and environmentally friendly; the experimental phenomena are obvious. (2) Thinking about related substances Problems such as preparation, purification, absorption, and storage. For example, when carbon dioxide is produced and the chemical properties of carbon dioxide are verified, because the produced carbon dioxide gas often contains hydrogen chloride gas and water vapor that is volatilized by hydrochloric acid, it is often verified before the nature of the device. Add a gas purification device and a drying device to prevent impurity gases and water vapor from affecting the experimental results.