在化学中考中,有部分计算比较复杂,但是如果我们借助于某些数学方法就能够较直观的解决。数轴,就可以帮助我们解决一些较复杂的化学计算。其应用的基本原理可以概括为:在数轴上的任意两点之间的数值,其取值范围介于这两个数值之间。一、混合物中有关元素质量分数的计算例1.某种氧化镁的样品中,其中氧元素的质量分数为46%,则其中可能含有的杂质是:A.二氧化锰B.氧化钙C.氧化铝D.氧化铜 In chemistry, some calculations are more complicated, but if we rely on some mathematical methods can be more intuitive solution. The number of axes, can help us to solve some of the more complex chemical calculations. The basic principle of its application can be summarized as follows: The numerical value between any two points on the number axis, the value range is between these two values. First, the mixture of elements related to the calculation of mass fraction Example 1. A sample of magnesium oxide, wherein the mass fraction of oxygen is 46%, then the impurities may contain: A. Manganese dioxide B. Calcium oxide. Alumina D. Copper oxide