'); (window.slotbydup=window.slotbydup || []).push({ id: '8096091', container: s, size: '580,90', display: 'inlay-fix' });})(); 1、电解水实验：电解水是在直流电的作用下，发生了化学反应。水分子分解成氢原子和...

'); (window.slotbydup=window.slotbydup || []).push({ id: '8096091', container: s, size: '580,90', display: 'inlay-fix' });})(); 1．含有较多可溶性钙、镁化合物的水叫硬水，不含或含较少可溶性钙、镁化合物的水叫...

'); (window.slotbydup=window.slotbydup || []).push({ id: '8096091', container: s, size: '580,90', display: 'inlay-fix' });})(); 了解单质、化合物的区别 单质：由同种元素组成的纯净物。 化合物：由多种元素组成的...

'); (window.slotbydup=window.slotbydup || []).push({ id: '8096091', container: s, size: '580,90', display: 'inlay-fix' });})(); 石油热裂副产的氢气产量很大，常用于汽油加氢，石油化工和化肥厂所需的氢气，这种...

'); (window.slotbydup=window.slotbydup || []).push({ id: '8096091', container: s, size: '580,90', display: 'inlay-fix' });})(); 空气的组成及各成分的用途： 空气的主要成分是氮气和氧气，分别约占空气体积的4/5和...

'); (window.slotbydup=window.slotbydup || []).push({ id: '8096091', container: s, size: '580,90', display: 'inlay-fix' });})(); 过度吸氧负作用: 早在19世纪中叶，英国科学家保尔伯特首先发现，如果让动物呼吸纯氧...

'); (window.slotbydup=window.slotbydup || []).push({ id: '8096091', container: s, size: '580,90', display: 'inlay-fix' });})(); 焦炉煤气冷冻制氢 把经初步提净的焦炉气冷冻加压，使其他气体液化而剩下氢气。此法...

'); (window.slotbydup=window.slotbydup || []).push({ id: '8096091', container: s, size: '580,90', display: 'inlay-fix' });})(); 检验氢气纯度的方法： 实验用品： 酒精灯，铁架台，大试管，干燥的小试管，长颈漏斗...

'); (window.slotbydup=window.slotbydup || []).push({ id: '8096091', container: s, size: '580,90', display: 'inlay-fix' });})(); 空气的组成及各成分的用途：空气的主要成分是氮气和氧气，分别约占空气体积的4/5和...

'); (window.slotbydup=window.slotbydup || []).push({ id: '8096091', container: s, size: '580,90', display: 'inlay-fix' });})(); 空气中氧气含量的测定：实验现象：①红磷(不能用木炭、硫磺、铁丝等代替)燃烧时有大...