神马作文网一道高中AP化学题不会了
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一道高中AP化学题不会了
The CsCl structure is a simple cubic array of chloride ions with a cesium ion at the center of each cubic array. Given that the density of cesium chloride is 3.97 g/cm3, and assuming that the chloride and cesium ions touch along the body diagonal of the cubic unit cell, calculate the distance between the centers of adjacent Cs+ and Cl - ions in the solid. Compare this value with the expected distance based on the sizes of the ions. The ionic radius of Cs+ is 169 pm, and the ionic radius of Cl - is 181 pm.calculated distance between the centers pm expected distance pm
The CsCl structure is a simple cubic array of chloride ions with a cesium ion at the center of each cubic array. Given that the density of cesium chloride is 3.97 g/cm3, and assuming that the chloride and cesium ions touch along the body diagonal of the cubic unit cell, calculate the distance between the centers of adjacent Cs+ and Cl - ions in the solid. Compare this value with the expected distance based on the sizes of the ions. The ionic radius of Cs+ is 169 pm, and the ionic radius of Cl - is 181 pm.calculated distance between the centers pm expected distance pm
翻译一下吧：CsCl的晶体结构是简单立方堆积,每个氯离子构成的立方体的中心有一个铯离子.已知氯化铯密度3.97g/mL,假设氯离子和铯离子在立方体的体对角线上是相接触的,计算固体中相邻的氯离子和铯离子中心间的距离.把这个结果和根据离子半径估计出的距离相比较.铯离子半径169pm,氯离子181pm. 第一个是根据密度算出每个晶胞的体积,再算出晶胞边长,即可求出.第二个直接169+181=350pm.比较的结果无非是第一个比第二个大,从而说明离子不是紧密排布的,真是老掉牙的东西. 还有一道题：一种晶体的结构是氧原子立方密堆,铝离子占据部分八面体空隙,镁离子占据部分四面体空隙.推出其结构（把结构用氧化物形式表示出来）. 既然都是占据“部分”,那就说不准了啊.像MgAl2O4之类的都有可能.