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物质的分离是通过适当的方法,将混合物中的各组分物质彼此分开,并且恢复到各种物质的原来存在状态,分别得到纯净物;而物质的提纯(即除杂)是利用被提纯物质和杂质的性质不同,来选择适当的实验方法除去被提纯物质中的少量杂质而得到纯净物的过程.提纯时要求只保留混合物中的提纯成分,除去的杂质不保留,这一点与物质的分离是不同的.中考中主要以除杂题型为主,重在考查混合物的分离及学生的发散思维和应变能力.
Material separation is through appropriate methods, the mixture of each component material separate from each other, and returned to the original existence of various substances, were pure; and purification of the material (ie impurity) is the use of purified material And impurities of different nature, to select the appropriate experimental method to remove impurities in the purification of a small amount of impurities to obtain the purification process requires purification only to keep the mixture of impurities in the mixture, remove the impurities do not remain, and this separation with the material Is different.In the senior high school entrance examination mainly to remove the QI type, focusing on examining the separation of the mixture and the students divergent thinking and adaptability.