中学生网络课堂本课配套习题挑战模式1/4
单选题
难度系数：
1.实验测得某氯的氧化物中，氯元素与氧元素的质量比为71：64，该氧化物的化学式为
| A: ClO |
| B: ClO2 |
| C: Cl2O3 |
| D: Cl2O5 |
一次做对，真牛！
+5奖励规则>
- 提示1：IOagueaNruWMluWQiOeJqeS4reWQhOWFg+e0oOi0qOmHj+avlD3lkITlhYPntKDnmoTnm7jlr7nljp/lrZDotKjph4/Dl+WOn+WtkOS4quaVsOS5i+avlO+8jOWPr+W+l+awp+WMlueJqeS4reawr+WOn+WtkOS4juawp+WOn+WtkOeahOS4quaVsOavlA==
- 提示2：IOS7o+WFpeaVsOWAvOWNs+WPrw==
- 提示3：IOWmguaenOWPiOmUmeS6hu+8jOivtOaYjuS9oOacieS6m+eyl+W/g+S6hg==
- 答案：Qg==
5qC55o2u5YyW5ZCI54mp5Lit5ZCE5YWD57Sg6LSo6YeP5q+UPeWQhOWFg+e0oOeahOebuOWvueWOn+WtkOi0qOmHj8OX5Y6f5a2Q5Liq5pWw5LmL5q+U77yM5Y+v5b6X5rCn5YyW54mp5Lit5rCv5Y6f5a2Q5LiO5rCn5Y6f5a2Q55qE5Liq5pWw5q+U5Li677yaPGJyPjxpbWcgd2lkdGg9NTUgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvMzMvRTkvckJBQ0UxTVM3T196VENJSUFBQUNBU0phOUxjNTEwLnBuZyI+PTLvvJo0PTHvvJoy77yM55Sx5q2k5Y+v55+lQ2xPPHN1Yj4yPC9zdWI+56ym5ZCI6KaB5rGC77yb
本课配套习题挑战模式2/4
单选题
难度系数：
2.
瘦肉精是一类对人体健康危害极大的化学物质，政府已严禁在猪饲料中添加瘦肉精. 常见的瘦肉精化学式为C12H18OCl2N2，下列有关这种瘦肉精的说法中正确的是
| A: 是一种无机化合物 |
| B: 分子中碳、氢、氧三种元素的质量比为72：9：8 |
| C: 相对分子质量为277g |
| D: 由C12H18O、Cl2、N2三种分子组成 |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+5qC55o2u5ZCr5pyJ56Kz5YWD57Sg55qE5YyW5ZCI54mp5Y+r5pyJ5py65YyW5ZCI54mp77yM566A56ew5pyJ5py654mpLiDnorPnmoTmsKfljJbnianjgIHnorPphbjnm5DjgIHnorPphbjomb3lkKvnorPvvIzkvYblhbbmgKfotKjkuI7ml6DmnLrniannsbvkvLzvvIzlm6DmraTmiorlroPku6znnIvkvZzml6DmnLrniakuIOWPr+WIpOaWreeYpuiCieeyvuaYr+S4gOenjeacieacuueJqS4g5pWFQemUmeivr++8mzxicj48L3A+
- 提示2：PHA+5qC55o2u55u45a+55YiG5a2Q55qE6LSo6YeP5Li657uE5oiQ5YiG5a2Q55qE5ZCE5Y6f5a2Q55qE55u45a+55Y6f5a2Q6LSo6YeP5LmL5ZKM77yM5Y+K55u45a+55Y6f5a2Q6LSo6YeP5piv5pyJ5Y2V5L2N55qE77yM5YW25Y2V5L2N5Li64oCcMeKAne+8jOWPquS4jei/h+W4uOecgeeVpeiAjOW3su+8m+aVhUPplJnor6/vvJs8YnI+PC9wPg==
- 提示3：PHA+5qC55o2u55im6IKJ57K+5YyW5a2m5byP5Li6QzxzdWI+MTI8L3N1Yj5IPHN1Yj4xODwvc3ViPk9DbDxzdWI+Mjwvc3ViPk48c3ViPjI8L3N1Yj7vvIznlLFD77yMSO+8jE/vvIxDbO+8jE7nianotKjlhYPntKDnu4TmiJDvvJvmr4/kuKrliIblrZDkuK3lkKvmnIkxMuS4qkPvvIwxOOS4qkjvvIwx5LiqT++8jDLkuKpDbO+8jDLkuKpO5Y6f5a2Q57uE5oiQ77yb5pWFROmUmeivr++8mzwvcD4=
- 答案：Qg==
PHA+QuOAgeagueaNruWMluWQiOeJqeS4reWQhOWFg+e0oOi0qOmHj+avlD3lkITlhYPntKDnmoTnm7jlr7nljp/lrZDotKjph4/Dl+WOn+WtkOS4quaVsOS5i+avlO+8m+WPr+W+l+eYpuiCieeyvuWIhuWtkOS4reeis+OAgeawouOAgeawp+S4ieenjeWFg+e0oOeahOi0qOmHj+avlOS4uu+8miDvvIgxMsOXMTLvvInvvJoxOO+8mjE2PTcy77yaOe+8mjjvvJvmlYVC5q2j56Gu77ybPC9wPjxwPuagueaNruWJjemdouaPkOekuuS4reWvuUFDROmAiemhueeahOWIhuaekO+8jOW+iOWuueaYk+mAieWHuuato+ehrumAiemhueWQp348L3A+
本课配套习题挑战模式3/4
单选题
难度系数：
3.某种氮元素与氧元素形成的化合物中，氮与氧两种元素的质量比为7:20，该氧化物的化学式为
| A: NO |
| B: N2O3 |
| C: NO2 |
| D: N2O5 |
一次做对，真牛！
+5奖励规则>
- 提示1：IOacrOmimOiAg+afpeWMluWtpuW8j+S4juWFg+e0oOi0qOmHj+avlOeahOaNoueulw==
- 提示2：IOiuvuacquefpeaVsOWNs+WPr+OAgg==
- 提示3：IDc6MjA977yIMTQ6MTbvvInDlyBYIOino+WHuljljbPlj68=
- 答案：RA==
6K6+Tk88c3ViPlg8L3N1Yj48YnI+NzoyMD0xNDrvvIgxNsOXWCDvvInop6Plh7pY5Y2z5Y+vPGJyPlg9Mi41IDxicj7ljJbnroDkuLpOPHN1Yj4yPC9zdWI+TzxzdWI+NTwvc3ViPuOAgg==
本课配套习题挑战模式4/4
单选题
难度系数：
4.
燃放烟花爆竹能产生一种具有刺激性气味的气体，会污染空气. 该气体由两种元素组成，其质量比为1：1. 这种气体是
| A: CO |
| B: SO2 |
| C: H2S |
| D: NO2 |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+Q0/msqHmnInmsJTlkbPvvIzkuJRDT+S4reeis+WFg+e0oOWSjOawp+WFg+e0oOeahOi0qOmHj+avlOS4ujEy77yaMTbiiaAx77yaMe+8jOaVhUHpgInpobnplJnor68uPC9wPg==
- 提示2：PHA+SDxzdWI+Mjwvc3ViPlPkuK3msKLlhYPntKDlkozmsKflhYPntKDnmoTotKjph4/mr5TkuLrvvIgxw5cy77yJ77yaMzLiiaAx77yaMe+8jOaVhUPpgInpobnplJnor68uPC9wPg==
- 提示3：PHA+Tk88c3ViPjI8L3N1Yj7kuK3msK7lhYPntKDlkozmsKflhYPntKDnmoTotKjph4/mr5TkuLoxNO+8mu+8iDE2w5cy77yJ4omgMe+8mjHvvIzmlYVE6YCJ6aG56ZSZ6K+vPC9wPg==
- 答案：Qg==
PHA+U088c3ViPjI8L3N1Yj7kuK3noavlhYPntKDlkozmsKflhYPntKDnmoTotKjph4/mr5TkuLozMu+8mu+8iDE2w5cy77yJPTHvvJox77yM5pWF6YCJ6aG5Quato+ehruOAgjxicj7lho3kvp3mja7liY3pnaLmj5DnpLrkuK3lr7lBQ0TnmoTliIbmnpDvvIzlvojlrrnmmJPpgInlh7rmraPnoa7nrZTmoYjlkKd+PGJyPjwvcD4=
