'); (window.slotbydup=window.slotbydup || []).push({ id: '8096091', container: s, size: '580,90', display: 'inlay-fix' });})(); 验证空气的组成(氧气的体积分数) (1)不使用硫和碳的原因：反应生成了气体 (2)不使用铁...

'); (window.slotbydup=window.slotbydup || []).push({ id: '8096091', container: s, size: '580,90', display: 'inlay-fix' });})(); 检查装置气密性常用的方法：装置连接好，将该装置导气管的一端浸没入水中，再用双...

'); (window.slotbydup=window.slotbydup || []).push({ id: '8096091', container: s, size: '580,90', display: 'inlay-fix' });})(); 化学实验操作应遵循的七个原则： 1.从下往上原则。 2.从左到右原则。装配复杂装置应...

'); (window.slotbydup=window.slotbydup || []).push({ id: '8096091', container: s, size: '580,90', display: 'inlay-fix' });})(); 过滤操作注意事项：一贴二低三靠 一贴：滤纸紧贴漏斗的内壁 二低：（1）滤纸的边缘...

'); (window.slotbydup=window.slotbydup || []).push({ id: '8096091', container: s, size: '580,90', display: 'inlay-fix' });})(); 溶液的稀释和浓缩 1.关于溶液稀释的计算： (1)溶液稀释前后，溶质的质量不变。 (2)若设...

'); (window.slotbydup=window.slotbydup || []).push({ id: '8096091', container: s, size: '580,90', display: 'inlay-fix' });})(); 吸附除去部分不溶性杂质、可溶性杂质、臭味、色素等。 利用活性炭等具有吸附作用的...

'); (window.slotbydup=window.slotbydup || []).push({ id: '8096091', container: s, size: '580,90', display: 'inlay-fix' });})(); 化合价 1、化合价是元素的化学性质之一。 2、化合价的表示方法：标在元素符号或原子...

'); (window.slotbydup=window.slotbydup || []).push({ id: '8096091', container: s, size: '580,90', display: 'inlay-fix' });})(); 硬水、软水 1.定义：硬水是指溶有碳酸氢钙、碳酸氢镁等物质较多的水。泉水、井水等...

'); (window.slotbydup=window.slotbydup || []).push({ id: '8096091', container: s, size: '580,90', display: 'inlay-fix' });})(); 水的净化过程：通常水的净化过程有如下几个步骤：静置沉淀、过滤、吸附和蒸馏。...

'); (window.slotbydup=window.slotbydup || []).push({ id: '8096091', container: s, size: '580,90', display: 'inlay-fix' });})(); 例1.在电解水的实验中，若与电源正极相连的试管内收集了nL气体，则与电源负极相连的...