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wust67
½ð³æ (ÖøÃûдÊÖ)
- ·ÒëEPI: 54
- Ó¦Öú: 1 (Ó×¶ùÔ°)
- ¹ó±ö: 0.005
- ½ð±Ò: 921.3
- É¢½ð: 175
- ºì»¨: 7
- Ìû×Ó: 1627
- ÔÚÏß: 339.5Сʱ
- ³æºÅ: 1009964
- ×¢²á: 2010-05-02
- רҵ: ¸ß·Ö×Ӻϳɻ¯Ñ§
2Â¥2010-10-30 22:45:54
wust67
½ð³æ (ÖøÃûдÊÖ)
- ·ÒëEPI: 54
- Ó¦Öú: 1 (Ó×¶ùÔ°)
- ¹ó±ö: 0.005
- ½ð±Ò: 921.3
- É¢½ð: 175
- ºì»¨: 7
- Ìû×Ó: 1627
- ÔÚÏß: 339.5Сʱ
- ³æºÅ: 1009964
- ×¢²á: 2010-05-02
- רҵ: ¸ß·Ö×Ӻϳɻ¯Ñ§
tsh2001(½ð±Ò+5): 2010-10-31 19:55:33
| ÕýÎÄ·Ò룺 The preparation of ferrous hydroxide introduced in "several important metal compounds", section¢ò of Chapter ¢ó, common high school chemistry curriculum standard one (compulsory, published by PEP), is referred to the iron hydroxide preparation method. The prepared ferrous hydroxide is exposured in air, which can be easily oxidized by oxygen. Thus, students generally can not see a white flocculent precipitate. In this paper, two improved methods of experimental preparation of ferrous hydroxide are discussed, showing better performance. |
3Â¥2010-10-30 23:11:50
wust67
½ð³æ (ÖøÃûдÊÖ)
- ·ÒëEPI: 54
- Ó¦Öú: 1 (Ó×¶ùÔ°)
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- ½ð±Ò: 921.3
- É¢½ð: 175
- ºì»¨: 7
- Ìû×Ó: 1627
- ÔÚÏß: 339.5Сʱ
- ³æºÅ: 1009964
- ×¢²á: 2010-05-02
- רҵ: ¸ß·Ö×Ӻϳɻ¯Ñ§
tsh2001(½ð±Ò+6): 2010-10-31 19:55:42
|
ÕýÎÄ·Ò룺 The preparation of ferrous hydroxide introduced in "several important metal compounds", section¢ò of Chapter ¢ó, common high school chemistry curriculum standard one (compulsory, published by PEP), is referred to the iron hydroxide preparation method. The prepared ferrous hydroxide is exposured in air, which can be easily oxidized by oxygen. Thus, students can rarely see a white flocculent precipitate. In this paper, two improved methods of experimental preparation of ferrous hydroxide are discussed, showing a better performance. ÉÔ×÷¸Ä¶¯¡£ |
4Â¥2010-10-30 23:17:44
petrocatal
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- ½ð±Ò: 3436.6
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- Ìû×Ó: 959
- ÔÚÏß: 299.5Сʱ
- ³æºÅ: 557856
- ×¢²á: 2008-05-13
- ÐÔ±ð: GG
- רҵ: Óлú»¯¹¤
tsh2001(½ð±Ò+5): 2010-10-31 19:55:11
|
ÕýÎÄ£ºAccording to content in "several important metal compounds", section¢ò of Chapter ¢ó, common high school chemistry curriculum standard one (compulsory, published by PEP), ferrous hydroxide is synthesized, referring to the preparation of iron hydroxide. The resulted ferrous hydroxide is easily oxidized due to the exposurement to air. Thus, the white flocculent precipitation could be hardly observed. In the paper, two methods for improving the preparation of ferrous hydroxide are discussed. ¸Ð¾õÖÐÎÄÓÐЩ´Ê¿ÉÒÔÍêÈ«²»·Ò룬¶øÇÒÓ¢Óïµ¥´Ê²»ÒËÖØ¸´¹ý¶à£¡ |

5Â¥2010-10-31 12:34:05













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