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物质的提纯(除杂)是中考的考点也是难点,给学生带来了不少的解题困扰。通常以选择题和填空题的形式出现。同学们必须要了解题目的实质和考试宗旨。首先,让我们来了解一下物质的提纯。物质的提纯(除杂)是除去物质中混有的杂质的过程,如除去铜粉中混有的铁粉。最后只要求得到铜粉,对铁则没有要求,但不能引入新的杂质。物质的提纯(除杂)是利用物质在物理性质(如溶解性)或化学性质上的差异来设计实验操作的。
Material purification (impurity) is the test center test is also difficult to bring a lot of students to troubleshoot problems. Usually in the form of multiple choice and fill in the blank form. Students must understand the essence of the exam and the purpose of the exam. First, let’s take a look at the purification of matter. Material purification (impurity removal) is to remove impurities in the material mixed process, such as removing copper mixed with iron powder. Lastly, only the copper powder was obtained, but there was no requirement for iron, but new impurities could not be introduced. Purification (impurity) is the use of material in the physical properties (such as solubility) or chemical differences in the design of experimental operation.