中学生网络课堂本课配套习题挑战模式1/5
单选题
难度系数：
1.计算硝酸铵（NH4NO3）中氮元素的质量分数。
| A: 34% |
| B: 36% |
| C: 35% |
| D: 37% |
一次做对，真牛！
+5奖励规则>
- 提示1：IE5IPHN1Yj40PC9zdWI+Tk88c3ViPjM8L3N1Yj7nmoTnm7jlr7nliIblrZDotKjph4/vvJoxNO+8izHDlzTvvIsxNO+8izE2w5cz77ydODA=
- 提示2：IOawruWFg+e0oOeahOi0qOmHj+WIhuaVsO+8mg0KPGltZyB3aWR0aD0zNzggaGVpZ2h0PTQ0IHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvMTAvRDEvckJBQ0ZGTVM3WURReHpReUFBQUl0a3MyUnZzODg5LnBuZyI+
- 答案：Qw==
5YWI566X5Ye6Tkg8c3ViPjQ8L3N1Yj5OTzxzdWI+Mzwvc3ViPueahOebuOWvueWIhuWtkOi0qOmHj++8mjE077yLMcOXNO+8izE077yLMTbDlzPvvJ04MO+8jOWGjeiuoeeul+awruWFg+e0oOeahOi0qOmHj+WIhuaVsO+8miA8aW1nIHdpZHRoPTM3OCBoZWlnaHQ9NDQgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC8xMC9EMS9yQkFDRkZNUzdZRFF4elF5QUFBSXRrczJSdnM4ODkucG5nIj4=
本课配套习题挑战模式2/5
单选题
难度系数：
2.
上图是某地市场销售的一种“加碘食盐”包装袋上的部分说明，请回答下列问题：碘酸钾（KIO3）中碘元素的质量分数是。（计算结果精确到0.1%）
在现代生活中，人们越来越注重微量元素的摄取。碘元素对人体有着至关重要的作用。
| 碘 盐 配料：氯化钠、碘酸钾（KIO3） 含碘量：（20～30）mg/kg 保质期：18个月 食用方法：勿长时间炖炒 贮藏指南：避光、避热、密封防潮 |
| A: 60% |
| B: 59.3% |
| C: 42.6% |
| D: 32.5% |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+PGltZyBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzM1Lzg2L3JCQUNFMU1UM296UnczSnVBQUFHemtUWV9TYzk3Ny5wbmciIGRhdGEtY2tlLXNhdmVkLXNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvMzUvODYvckJBQ0UxTVQzb3pSdzNKdUFBQUd6a1RZX1NjOTc3LnBuZyIgaGVpZ2h0PSIzNyIgd2lkdGg9IjMzOSI+6L+b6KGM5YiG5p6Q6Kej562UPGJyPjwvcD4=
- 答案：Qg==
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
本课配套习题挑战模式3/5
单选题
难度系数：
3.
利尿酸（C13H12Cl2O3）有很强的利尿作用，能快速降低体重并稀释尿液，可以掩盖所服用的兴奋剂而逃避检查，因此利尿酸在奥运会上被禁用。根据利尿酸的化学式可获得的信息不正确的是
| A: 利尿酸的相对分子质量287 |
| B: 利尿酸由4种元素组成 |
| C: 利尿酸分子中各原子个数比为13：12：2：3 |
| D: 利尿酸中碳元素的质量分数为60% |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+QS7nm7jlr7nliIblrZDotKjph4/nrYnkuo7lkITljp/lrZDotKjph4/nmoTmgLvlkozvvIzmlYXliKnlsL/phbjnmoTnm7jlr7nliIblrZDotKjph4/kuLrvvJoxM8OXMTIrMTLDlzErMzUuNcOXMisxNsOXM+KVkDI4N++8jOaVhUHmraPnoa7vvJs8L3A+
- 提示2：PHA+Qi7liKnlsL/phbjmmK/nlLFD44CBSOOAgUNs44CBT+Wbm+enjeWFg+e0oOe7hOaIkO+8jOaVhULor7Tms5XmraPnoa7vvJs8YnI+PC9wPg==
- 提示3：PHA+Qy7moLnmja7ljJblrablvI/kuK3lhYPntKDnrKblj7flj7PkuIvop5LnmoTmlbDlrZfooajnpLrlkITljp/lrZDnmoTljp/lrZDkuKrmlbDvvIzlj6/nn6XlkITljp/lrZDkuKrmlbDmr5TkuLoxM++8mjEy77yaMu+8mjPvvIzmlYVD6K+05rOV5q2j56Gu77ybPC9wPg==
- 提示4：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
- 答案：RA==
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
本课配套习题挑战模式4/5
单选题
难度系数：
4.
陶瓷是传统的无机非金属材料，黏土（主要成分Al2Si2O5(OH)4）是制备陶瓷的原料之一。下列关于Al2Si2O5(OH)4的说法中，正确的是
| A: 它由4种元素组成 |
| B: 该物质高温时会生成CO2气体 |
| C: 其中氢、氧元素的质量比是4：9 |
| D: 其中硅元素的质量分数是最高的 |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+Jm5ic3A7Qi7lm6Dor6XnianotKjkuK3kuI3lkKvmnIlD5YWD57Sg77yM5YiZ5LiN5Lya6auY5rip5Lqn55Sf5LqM5rCn5YyW56Kz77yM5pWFQumUmeivr++8mzwvcD4=
- 提示2：PHA+Qy7nlLHljJblrablvI/lj6/lvpdI44CBT+WFg+e0oOeahOi0qOmHj+avlOS4ujHDlzTvvJoxNsOXOT0x77yaMzbvvIzmlYVD6ZSZ6K+v77ybPC9wPg==
- 提示3：PHA+Jm5ic3A7RC7nlLHljJblrablvI/lj6/nn6UxNsOXOe+8njI4w5cy77yeMjfDlzLvvJ4xw5c077yM5YiZ5rCn5YWD57Sg55qE6LSo6YeP5YiG5pWw5pyA6auY77yM5pWFROmUmeivr+OAgjwvcD4=
- 答案：QQ==
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
本课配套习题挑战模式5/5
单选题
难度系数：
5.某铁的氧化物中氧的质量分数为30％，求该氧化物的化学式
| A: Fe2O3 |
| B: FeO |
| C: Fe3O4 |
| D: 无法判断 |
一次做对，真牛！
+5奖励规则>
- 提示1：IOiuvuivpeawp+WMlueJqeS4ukZlPHN1Yj54PC9zdWI+TzxzdWI+eTwvc3ViPu+8jDxpbWcgd2lkdGg9MTQ1IGhlaWdodD00MSBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzMzL0VEL3JCQUNFMU1TN1llVFBMc3JBQUFEMlRVek0xZzUzMS5wbmciPu+8jDxpbWcgd2lkdGg9NDAgaGVpZ2h0PTQxIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvMTAvRDIvckJBQ0ZGTVM3WWV6TVpGU0FBQUNLeVBIc3U4ODk2LnBuZyI+
- 提示2：IOivpeawp+WMlueJqeS4ukZlPHN1Yj4yPC9zdWI+TzxzdWI+Mzwvc3ViPg==
- 答案：QQ==
6K6+6K+l5rCn5YyW54mp5Li6RmU8c3ViPng8L3N1Yj5PPHN1Yj55PC9zdWI+77yMPGltZyB3aWR0aD0xNDUgaGVpZ2h0PTQxIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvMzMvRUQvckJBQ0UxTVM3WWVUUExzckFBQUQyVFV6TTFnNTMxLnBuZyI+77yMPGltZyB3aWR0aD00MCBoZWlnaHQ9NDEgc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC8xMC9EMi9yQkFDRkZNUzdZZXpNWkZTQUFBQ0t5UEhzdTg4OTYucG5nIj7vvIzor6XmsKfljJbniankuLpGZTxzdWI+Mjwvc3ViPk88c3ViPjM8L3N1Yj7jgII=
