中学生网络课堂本课配套习题挑战模式2/5
多选题
难度系数：
2.把质量为mg的铜丝灼烧变成黑色，立即放入下列物质中，使铜丝变成红色，而且质量仍为mg的是
| A: 稀H2SO4 |
| B: C2H5OH |
| C: CH3COOH溶液 |
| D: CO |
一次做对，真牛！
+5奖励规则>
- 提示1：6aaW5YWI6ICD6JmR5pys6IqC6K++5a2m5Lmg55qE5LmZ6YaH5YKs5YyW5rCn5YyW55qE5Y+N5bqU77yb
- 提示2：5pys6aKY6L+Y5a655piT5ryP6YCJ77yM6ZyA6KaB5YiG5Yir5YiG5p6Q5Zub5Liq6YCJ6aG55ZCE6Ieq5aaC5L2V5Y+N5bqU44CC
- 答案：QixE
5LmZ6YaH5Y+v5Lul5LiO5rCn5YyW6ZOc5Y+N5bqU55Sf5oiQ6ZOc5Y2V6LSo77yM6Ieq6Lqr6KKr5rCn5YyW5Li65LmZ6Yab77ybPGJyPuWPpuWklui/mOmcgOimgeazqOaEj++8jENP5ZCM5qC35Y+v5Lul5bCG5rCn5YyW6ZOc6L+Y5Y6f5Li66ZOc5Y2V6LSo77yM5qC55o2u6LSo6YeP5a6I5oGS77yM6ZOc5Y2V6LSo55qE6LSo6YeP5piv5L2T57O75Lit5omA5pyJ5Y+C5Yqg5Y+N5bqU55qE6ZOc5YWD57Sg55qE6LSo6YeP77yM5Lmf5bCx5piv6ZOc5Y2V6LSo55qE6LSo6YeP5LiN5Lya5Y+R55Sf5pS55Y+Y44CC
本课配套习题挑战模式3/5
单选题
难度系数：
3.欲除漆包铜线表面的油漆，可将铜线放在酒精灯火焰上灼烧后，再将其放入某种试剂中，即可除净，该试剂是
| A: 乙醇 |
| B: 醋酸 |
| C: 硝酸 |
| D: 硫酸 |
一次做对，真牛！
+5奖励规则>
- 提示1：5pys6aKY6KaB6Zmk5Y675rK55ryG55u45b2T5LqO57KX6ZOc5o+Q57qv44CC
- 答案：QQ==
6ZOc5Yqg54Ot55Sf5oiQ5rCn5YyW6ZOc77yM5pei54S26IO96Zmk5Y6777yM6K+05piO6K+l54mp6LSo5YW35pyJ6L+Y5Y6f5oCn77yM6IO96L+Y5Y6f5rCn5YyW6ZOc77yM5omA5Lul6YCJ6aG5Qeato+ehru+8jEJDROmDveiDvea6tuino+mTnO+8jOS4jeato+ehruOAguetlOahiOmAiUHjgII=
本课配套习题挑战模式4/5
单选题
难度系数：
4.酒后驾车是引发交通事故的重要原因。交警对驾驶员进行呼气酒精检测的原理是：橙色的K2Cr2O7酸性水溶液遇乙醇迅速生成蓝绿色Cr3+。下列对乙醇的描述与此测定原理有关的是①乙醇沸点低 ②乙醇密度比水小 ③乙醇有还原性④乙醇具有可燃性
| A: ②④ |
| B: ②③ |
| C: ①③ |
| D: ①④ |
一次做对，真牛！
+5奖励规则>
- 提示1：5rWL6K+V5pe26ZyA6KaB6am+6am25ZGY5a+5552A5qOA5rWL5Luq5ZC55LiA5LiL77yM5qC55o2u6L+Z5LiA54K55Y+v5Lul5o6o5rWL5Ye65LmZ6YaH55qE5LiA5Liq5oCn6LSo44CC
- 提示2：57un57ut5YiG5p6Q5LmZ6YaH5LiO6ZOs6YW46ZK+55qE5Y+N5bqU5bGe5LqO5ZOq56eN57G75Z6L44CC
- 答案：Qw==
6am+6am25ZGY5ZCR5qOA5rWL5Luq5ZC55LiA5Y+j5rCU77yM55Sx5LqO6YWS57K+5rK454K55L2O77yM5piT5oyl5Y+R77yM5Zug5q2k5ZG85Ye65rCU5L2T5Lit5ZCr5pyJ6YWS57K+44CC6YWS57K+5Y+v5Lul6KKr6ZOs6YW46ZK+5rCn5YyW77yM6ICM6ZOs6YW46ZK+6Ieq6Lqr6KKr6L+Y5Y6f5Li65LiJ5Lu355qE6ZOs56a75a2Q77yM5Zug5q2k6L+Y5L2T546w5LqG5LmZ6YaH55qE6L+Y5Y6f5oCn77ybPGJyPue7vOS4iumAieaLqUPpobnjgII=
本课配套习题挑战模式5/5
单选题
难度系数：
5.将等质量的铜片在酒精灯上加热后，分别加入下列溶液中，放置片刻，取出金属片干燥称量，金属片质量由小到大的顺序正确的是①硝酸 ②盐酸 ③无水乙醇 ④石灰水
| A: ①②③④ |
| B: ②①③④ |
| C: ①④③② |
| D: ④②①③ |
一次做对，真牛！
+5奖励规则>
- 提示1：5pys6aKY6ZyA5LiA5LiA5YiG5p6Q5ZCE6YCJ6aG55LiO6ZOc55qE5Y+N5bqU5Y2z5Y+v44CC
- 答案：QQ==
4pGg5Zug6ZOc54mH5Zyo6YWS57K+54Gv5LiK5Yqg54Ot5ZCO55Sf5oiQQ3VP77yM6LSo6YeP5aKe5Yqg77yM5bCG5a6D5oqV5YWl56Gd6YW45Lit77yM5Y+R55Sf5Y+N5bqU77yaQ3VPKzJITk88c3ViPjM8L3N1Yj7ilZBDde+8iE5PPHN1Yj4zPC9zdWI+77yJPHN1Yj4yPC9zdWI+K0g8c3ViPjI8L3N1Yj5P77yMQ3U8c3VwPjIrPC9zdXA+6L+b5YWl5rq25ray77yM5bm25LiU6ZOc5LiO56Gd6YW45Y+N5bqU77yM6ZOc54mH55qE6LSo6YeP5Lya5YeP5bCP77ybPGJyPuKRoeWboOmTnOeJh+WcqOmFkueyvueBr+S4iuWKoOeDreWQjueUn+aIkEN1T++8jOi0qOmHj+WinuWKoO+8jOWwhuWug+aKleWFpeebkOmFuOS4re+8jOWPkeeUn+WPjeW6lO+8mkN1TysySENs4pWQQ3VDbDxzdWI+Mjwvc3ViPitIPHN1Yj4yPC9zdWI+T++8jEN1PHN1cD4yKzwvc3VwPui/m+WFpea6tua2su+8jOW5tuS4lOmTnOS4juebkOmFuOS4jeWPjeW6lO+8jOmTnOeJh+eahOi0qOmHj+S8muWHj+Wwj++8jOi0qOmHj+WHj+WwkeS4jeWmguKRoOWHj+WwkeeahOWkmu+8mzxicj7ikaLlm6Dpk5zniYflnKjphZLnsr7nga/kuIrliqDng63lkI7nlJ/miJBDdU/vvIzotKjph4/lop7liqDvvIzlsIblroPmipXlhaXml6DmsLTkuZnphofkuK3vvIzlj5HnlJ/lj43lupTvvJpDSDxzdWI+Mzwvc3ViPkNIPHN1Yj4yPC9zdWI+T0grQ3VPLeKGkkNIPHN1Yj4zPC9zdWI+Q0hPK0g8c3ViPjI8L3N1Yj5PK0N177yM5Y+I5oGi5aSN5Li66ZOc77yM6ZOc54mH55qE6LSo6YeP5LiN5Y+Y77ybPGJyPuKRo+WboOmTnOeJh+WcqOmFkueyvueBr+S4iuWKoOeDreWQjueUn+aIkEN1T++8jOi0qOmHj+WinuWKoO+8jOWwhuWug+aKleWFpeefs+eBsOawtOS4re+8jOawp+WMlumTnOS4jeS4juefs+eBsOawtOWPjeW6lO+8jOmTnOeJh+i0qOmHj+WinuWKoO+8mzxicj7mlYXph5HlsZ7niYfotKjph4/nlLHlsI/liLDlpKfnmoTpobrluo/ikaDikaHikaLikaPvvIw8YnI+5pWF6YCJQe+8jjxicj4=
