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2022年初中化学：硬水及其软化
2022-07-19'); (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...
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2022初中化学：了解单质、化合物的区别
2022-07-19'); (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...
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2022年初中化学：物质的组成与构成
2022-06-20'); (window.slotbydup=window.slotbydup || []).push({ id: '8096091', container: s, size: '580,90', display: 'inlay-fix' });})(); 物质的组成与构成 (1)物质组成。混合物、纯净物(单质、化合物) (2)物质构成(构成物质的...
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2022年初中化学：水污染
2022-06-20'); (window.slotbydup=window.slotbydup || []).push({ id: '8096091', container: s, size: '580,90', display: 'inlay-fix' });})();...
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2022年初中化学;氢气燃烧实验
2022-06-20'); (window.slotbydup=window.slotbydup || []).push({ id: '8096091', container: s, size: '580,90', display: 'inlay-fix' });})(); 氢气燃烧的实验...
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2022年初中化学：水的化合价
2022-06-20'); (window.slotbydup=window.slotbydup || []).push({ id: '8096091', container: s, size: '580,90', display: 'inlay-fix' });})();...
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2022年初中化学：水蒸气的检验方法
2022-06-20'); (window.slotbydup=window.slotbydup || []).push({ id: '8096091', container: s, size: '580,90', display: 'inlay-fix' });})(); 水蒸气的检验方法： 用无水硫酸铜，如无水硫酸铜由白色变为蓝色，则说明有水存在。...
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2022年初中化学：水的污染与防治
2022-06-20'); (window.slotbydup=window.slotbydup || []).push({ id: '8096091', container: s, size: '580,90', display: 'inlay-fix' });})(); 水污染的原因：①工业生产中的三废一废渣、废气、废水的任意排放；②生活污水的任...
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2022年初中化学：硬水及其软化
2022-06-20'); (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、镁化合物的水叫软...
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2022你初中化学通过氢气还原氧化铜测定水中氢、氧元素的质量比
2022-06-20'); (window.slotbydup=window.slotbydup || []).push({ id: '8096091', container: s, size: '580,90', display: 'inlay-fix' });})(); 所用药品为H2、CuO和无水硫酸铜或CaCl2，反应原理是让H2与CuO反应，生成的水被吸收装置...