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.
将下列金属放入水中，反应最剧烈的是
| A: Fe |
| B: Na |
| C: Cu |
| D: Al |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+5LiO5rC05Y+N5bqU55qE5Ymn54OI56iL5bqm5Y+v5Lul5qC55o2u6YeR5bGe5rS75Yqo5oCn6aG65bqP6KGo5p2l5Yik5pat44CCPC9wPg==
- 答案：Qg==
PHA+5qC55o2u6YeR5bGe5rS75Yqo5oCn6aG65bqP6KGo77yM6L+Z5Yeg56eN6YeR5bGe55qE5rS75Yqo5oCn77yaTmEmZ3Q7QWwmZ3Q7RmUmZ3Q7Q3XjgILlm6DmraTpkqDkuI7msLTnmoTlj43lupTmnIDliafng4jjgII8L3A+
本课配套习题挑战模式2/5
单选题
难度系数：
2.
把一小块钠放入滴有酚酞试液的水中，下列现象不易观察到的是
| A: 钠浮在水面上 |
| B: 溶液中产生较多气泡 |
| C: 水溶液变为红色 |
| D: 钠熔化成小球并在水面游动 |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+5pys6aKY6Zq+54K55Zyo5LqO6KGo6L+w55qE5oqK5o+h44CC6ZKg5rWu5Zyo5rC06Z2i5LiK5Y+R55Sf5Y+N5bqU77yM5bm26Z2e5Zyo5rq25ray5Lit44CCPC9wPg==
- 答案：Qg==
PHA+6ZKg55qE5a+G5bqm5q+U5rC05bCP77yM5Zug5q2k5Lya5rWu5Zyo5rC06Z2i5LiK77ybPGJyPumSoOS4juawtOWPjeW6lOWcqOawtOmdouS4iuS6p+eUn+awlOS9k++8jOaOqOWKqOmSoOeGlOWMluaIkOeahOWwj+eQg+WcqOawtOmdouS4iua4uOWKqO+8jOiAjOS4jeaYr+WcqOa6tua2suS4reS6p+eUn+i+g+WkmuawlOazoe+8m0LpobnplJnor6/jgII8YnI+55Sx5LqO5Y+N5bqU5ZCO55Sf5oiQ5LqGTmFPSOi/meenjeW8uueise+8jOWboOatpOWQq+aciemFmumFnueahOawtOa6tua2suWPmOS4uue6ouiJsuOAgjwvcD4=
本课配套习题挑战模式3/5
单选题
难度系数：
3.
取一小块金属钠放在滴有酚酞的水中，下列实验现象正确的是
①钠浮在水面迅速反应②钠沉在水底迅速反应③钠熔成小球并快速游动④反应后的溶液变为红色⑤反应中可以听到嘶嘶的响声．
| A: ①④⑤ |
| B: ②③⑤ |
| C: ②③④⑤ |
| D: ①③④⑤ |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+6ZKg5LiO5rC05Y+N5bqU55qE546w6LGh5oC757uT5Li677ya5rWu44CB54aU44CB5ri444CB5ZON44CB57qi44CCPC9wPg==
- 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.
把4.6g钠投放到195.4g水中，所得溶液的质量分数为
| A: 2.3% |
| B: 大于2.3% |
| C: 4% |
| D: 大于4% |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+5pys6aKY5pyA6ZyA6KaB5rOo5oSP55qE5LiA54K55piv77yM5Y+N5bqU5pyJ5rCU5L2T5pS+5Ye677yM5Zug5q2k5rq25ray55qE5oC76LSo6YeP5bm26Z2e5Y2V6LSo6ZKg5LiO5rC055qE6LSo6YeP5ZKM77yM6L+Y6ZyA6KaB5YeP5Y675Lqn55Sf5rCi5rCU55qE6YeP44CCPC9wPg==
- 答案：RA==
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
本课配套习题挑战模式5/5
单选题
难度系数：
5.
将2.3克钠投入W克水中，所得溶液中Na+与水分子个数之比1：100，溶液密度为1.2g•ml-1，下列有关说法不正确的是
| A: W=181.8 |
| B: 此过程中，水被还原，共得到0.1NA个电子 |
| C: 所得溶液中溶质质量分数约为21.74% |
| D: 仅据上述条件无法求算所得溶液的物质的量浓度 |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+6KaB5rOo5oSP5rC05LiN5LuF5LuF5piv5rq25YmC6L+Y5piv5Liq5Y+N5bqU54mp44CC6ICM6aKY5bmy5Lit57uZ5Ye655qE5L+h5oGv5Z2H5Li65omA5b6X5rq25ray55qE44CCPC9wPg==
- 答案：RA==
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
