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.下列符号中既能表示一种元素，又能表示一种元素的一个原子，还能代表一种单质的是
| A: H |
| B: N2 |
| C: Fe |
| D: O |
一次做对，真牛！
+5奖励规则>
- 提示1：5qC55o2u5YWD57Sg56ym5Y+355qE5ZCr5LmJ6L+b6KGM5YiG5p6Q6Kej562U77yM6YeR5bGe44CB5Zu65L2T6Z2e6YeR5bGe44CB56iA5pyJ5rCU5L2T6YO95piv55Sx5Y6f5a2Q55u05o6l5p6E5oiQ55qE77yM5pWF5a6D5Lus55qE5YWD57Sg56ym5Y+377yM5pei6IO96KGo56S65LiA5Liq5Y6f5a2Q77yM5Y+I6IO96KGo56S65LiA56eN5YWD57Sg77yM6L+Y6IO96KGo56S65LiA56eN54mp6LSo77yO
- 答案：Qw==
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
本课配套习题挑战模式2/5
单选题
难度系数：
2.有关过氧化氢（化学式为H2O2）的说法，正确的是
| A: 过氧化氢是由氢元素和氧元素组成 |
| B: 过氧化氢是由氢气和氧气组成 |
| C: 过氧化氢是由氢分子和氧分子构成 |
| D: 过氧化氢是由两个氢原子和两个氧原子构成 |
一次做对，真牛！
+5奖励规则>
- 提示1：4pGg5a6P6KeC5oSP5LmJ77yaYe+8juihqOekuuS4gOenjeeJqei0qO+8myBi77yO6KGo56S66K+l54mp6LSo55qE5YWD57Sg57uE5oiQ77yb
- 提示2：4pGh5b6u6KeC5oSP5LmJ77yaYe+8juihqOekuuivpeeJqei0qOeahOS4gOS4quWIhuWtkO+8myBi77yO6KGo56S66K+l54mp6LSo55qE5YiG5a2Q5p6E5oiQ77yb
- 答案：QQ==
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
本课配套习题挑战模式3/5
单选题
难度系数：
3.下列符号既能表示一种元素，又能表示该元素的一个原子，还能表示一种单质的是
| A: N2 |
| B: H |
| C: O |
| D: Fe |
一次做对，真牛！
+5奖励规则>
- 提示1：5qC55o2u5YyW5a2m5byP5LiO5YWD57Sg56ym5Y+355qE5ZCr5LmJ6L+b6KGM5YiG5p6Q6Kej562U77yM6YeR5bGe44CB5aSn5aSa5pWw5Zu65L2T6Z2e6YeR5bGe562J6YO95piv55Sx5Y6f5a2Q55u05o6l5p6E5oiQ55qE77yM5pWF5a6D5Lus55qE5YWD57Sg56ym5Y+377yM5pei6IO96KGo56S65LiA5Liq5Y6f5a2Q77yM5Y+I6IO96KGo56S65LiA56eN5YWD57Sg77yM6L+Y6IO96KGo56S65LiA56eN54mp6LSo77yO
- 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.下列符号既能表示一种元素又能表示一个原子，还能表示一种单质的是
| A: O2 |
| B: Mg |
| C: H |
| D: N |
一次做对，真牛！
+5奖励规则>
- 提示1：5YWD57Sg56ym5Y+36IO96KGo56S65LiA56eN5YWD57Sg77yM6L+Y6IO96KGo56S66K+l5YWD57Sg55qE5LiA5Liq5Y6f5a2Q77yb5YyW5a2m5byP6IO96KGo56S65LiA56eN54mp6LSo77yM5b2T5YWD57Sg56ym5Y+35Y+I5piv5YyW5a2m5byP5pe277yM5bCx5ZCM5pe25YW35aSH5LqG5LiK6L+w5LiJ5bGC5oSP5LmJ77yO
- 答案：Qg==
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
本课配套习题挑战模式5/5
单选题
难度系数：
5.2014年央视3.15晚会发布信息：市场上一些橡皮、涂改液经检测机构检验后发现甲苯（C7H8）超标34倍．甲苯不但会刺激眼睛、呼吸道，如果在密闭空间里大量吸入，还会造成急性中毒，甚至会致癌．下列有关甲苯的说法错误的是
| A: 从性质上看：甲苯是一种有毒的物质 |
| B: 从变化上看：甲苯完全燃烧只生成水 |
| C: 从宏观上看：甲苯由碳、氢二种元素组成 |
| D: 从微观上看：1个甲苯分子由7个碳原子和8个氢原子构成 |
一次做对，真牛！
+5奖励规则>
- 提示1：55Sy6Iuv5YyW5a2m5byP5Li6QzxzdWI+Nzwvc3ViPkg8c3ViPjg8L3N1Yj7vvIzljJblrablvI/ooajnpLrnmoTmhI/kuYnvvJrooajnpLrnlLLoi6/ov5nnp43nianotKjvvJvooajnpLrnlLLoi6/nlLHnorPlhYPntKDjgIHmsKLlhYPntKDnu4TmiJDnmoTvvJvooajnpLrnlLLoi6/nmoTkuIDkuKrliIblrZDlkozliIblrZDnmoTmnoTmiJDnrYnvvI4=
- 答案：Qg==
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
