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.现有20 ℃ NaCl的饱和溶液100 g，欲改变溶液中溶质的质量分数，下列方法中正确的是
| A: 温度不变加入10 g NaCl晶体 |
| B: 温度不变蒸发掉10 g水 |
| C: 温度不变加入10 g水 |
| D: 温度不变取出10 g溶液 |
一次做对，真牛！
+5奖励规则>
- 提示1：5Zub5Liq6YCJ6aG55Lit5Z2H5Li64oCc5rip5bqm5LiN5Y+Y4oCd77yM5Zyo5q2k5rip5bqm5LiL77yM5Y+q6KaB6L+Y5piv6aWx5ZKM5rq25ray77yM6LSo6YeP5YiG5pWw5bCx5LiN5Lya5Y+R55Sf5pS55Y+Y44CC
- 提示2：5rq25ray5piv5Z2H5LiA55qE77yM5ZCE6YOo5YiG6YO955u45ZCM44CC5Y+W5Ye65LiA6YOo5YiG5rq25ray5a+55pys6Lqr55qE6LSo6YeP5YiG5pWw5rKh5pyJ5b2x5ZON44CC
- 答案：Qw==
5Zyo5rip5bqm5LiN5Y+Y5pe277yM5ZCR6aWx5ZKM5rq25ray5Lit5Yqg5YWlTmFDbOaZtuS9k++8jOS9huaZtuS9k+S4jea6tuino++8jOWboOatpOa6tua2sueahOi0qOmHj+WIhuaVsOS4jeWPkeeUn+aUueWPmO+8jEHpobnplJnor6/vvJs8YnI+5rip5bqm5LiN5Y+Y5pe26JK45Y+R5o6JMTBn5rC077yM5rq25ray5L6d5pen5Li66K+l5rip5bqm5LiL55qE6aWx5ZKM5rq25ray77yM6LSo6YeP5YiG5pWw5Lmf5LiN5Y+R55Sf5pS55Y+Y44CCQumhuemUmeivr++8mzxicj7muKnluqbkuI3lj5jliqDlhaUxMGfmsLTvvIzmurbmtrLnmoTotKjph4/lj5HnlJ/mlLnlj5jvvIzogIzmurbotKjnmoTotKjph4/kuI3lj5HnlJ/mlLnlj5jvvIzlm6DmraTotKjph4/liIbmlbDlj5HnlJ/mlLnlj5jjgIJD6aG55q2j56Gu77ybPGJyPuWPluWHuuS4gOmDqOWIhua6tua2suWvuea6tua2sueahOi0qOmHj+WIhuaVsOayoeacieW9seWTjeOAguWboOatpETpobnplJnor6/jgII8YnI+57u85LiK77yM6YCJ5oupQ+mhueOAgg==
本课配套习题挑战模式2/5
单选题
难度系数：
2.化学实验室现有98%的浓硫酸，但是在实验中同学们需要用较稀的硫酸。要把50 g质量分数为98％、密度为1.84g／cm3的浓硫酸稀释为质量分数为20％的稀硫酸，需加水的体积为
| A: 196 mL |
| B: 106 mL |
| C: 106.5 mL |
| D: 195 mL |
一次做对，真牛！
+5奖励规则>
- 提示1：5YWz5LqO56iA6YeK55qE6Zeu6aKY77yM5Y+v5Lul6K6+5pyq55+l5pWw77yM54S25ZCO5qC55o2u4oCc56iA6YeK5YmN5ZCO5rq26LSo55qE6LSo6YeP5LiN5Y+Y4oCd5YiX5Ye65pa556iL77yM6L+b6KGM6K6h566X44CC
- 答案：RA==
6K6+77yM6KaB5oqKNTBn6LSo6YeP5YiG5pWw5Li6OTjvvIXjgIHlr4bluqbkuLoxLjg0IGfvvI9jbTxzdXA+Mzwvc3VwPueahOa1k+ehq+mFuOeogOmHiuS4uui0qOmHj+WIhuaVsOS4ujIw77yF55qE56iA56Gr6YW477yM6ZyA5Yqg5rC055qE6LSo6YeP5Li6PGk+eDwvaT7jgII8YnI+NTBnw5c5OO+8hT3vvIg1MCs8aT54PC9pPu+8icOXMjAl77yMPGJyPuino+W+lyA8aT54PC9pPj0xOTVn77yM5pWF5rC055qE5L2T56ev5Li6MTk1IG1M44CCPGJyPumAiUTjgII=
本课配套习题挑战模式3/5
单选题
难度系数：
3.浓硫酸和浓盐酸敞口放置一段时间后，其溶液中溶质的质量分数
| A: 都变大 |
| B: 前者变大，后者变小 |
| C: 都变小 |
| D: 前者变小，后者变大 |
一次做对，真牛！
+5奖励规则>
- 提示1：5rWT56Gr6YW45YW35pyJ5ZC45rC05oCn
- 提示2：5rWT55uQ6YW45YW35pyJ5oyl5Y+R5oCn
- 答案：Qw==
6Kej77ya5rWT56Gr6YW45YW35pyJ5ZC45rC05oCn77yM5ZC45pS25rC05YiG5ZCO77yM5rq25ray6LSo6YeP5aKe5aSn77yM5rq26LSo6LSo6YeP5LiN5Y+Y44CC5rq26LSo6LSo6YeP5YiG5pWw5Y+Y5bCP77yMPGJyPua1k+ebkOmFuOWFt+acieaMpeWPkeaAp++8jOaMpeWPkeWQjua6tui0qOWHj+Wwke+8jOa6tui0qOi0qOmHj+WIhuaVsOWHj+Wwj++8jDxicj7mlYXpgIlD77yO
本课配套习题挑战模式4/5
单选题
难度系数：
4.在温度不变的条件下，下列欲使溶质的质量分数变为原来2倍的方法，最可行的是
| A: 将20g硝酸钾饱和溶液蒸发掉10g水 |
| B: 将20g硝酸钾不饱和溶液蒸发掉10g水 |
| C: 在10g10﹪的硝酸钾溶液中，加入5g40﹪的硝酸钾溶液 |
| D: 将10g硝酸钾不饱和溶液中加入10g硝酸钾固体 |
一次做对，真牛！
+5奖励规则>
- 提示1：5pys6aKY6ZyA5YiG5Yir6K6h566X5Zub5Liq6YCJ6aG55Lit5Y+Y5YyW5ZCO55qE5rq26LSo6LSo6YeP5YiG5pWw44CC
- 提示2：5rOo5oSP5LiA5a6a5rip5bqm5LiL77yM6aWx5ZKM5rq25ray55qE6LSo6YeP5YiG5pWw5LiN6IO95YaN5aKe5Yqg44CC
- 提示3：QumhueiSuOWPkeaOiTEwZ+awtOWQju+8jOS4jeiDveS/neivgeayoeacieWbuuS9k+aekOWHuuOAgiA=
- 答案：Qw==
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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80 g10%的NaOH溶液与20 g 15%的NaOH溶液混合，混合溶液中溶质的质量分数为
| A: 13% |
| B: 12% |
| C: 11% |
| D: 16% |
一次做对，真牛！
+5奖励规则>
- 提示1：5qC55o2u5rq26LSo6LSo6YeP5YiG5pWw5a6a5LmJ5byP6L+b6KGM6K6h566X
- 提示2：5rq26LSo6LSo6YeP562J5LqO5re35ZCI5LmL5YmNIOS4pOenjea6tua2sueahOa6tui0qOi0qOmHj+S5i+WSjOOAgg==
- 提示3：5rq25ray562J5LqO5re35ZCI5LmL5YmNIOS4pOenjea6tua2sueahOa6tua2sui0qOmHj+S5i+WSjOOAgg==
- 答案：Qw==
5re35ZCI5rq25ray5Lit5rq26LSo55qE6LSo6YeP5YiG5pWw5Li677yaPGltZyB3aWR0aD0xNTUgaGVpZ2h0PTMwIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvNzcvQTMvckJBQ0UxVFJ6aU93SmNnWUFBQUJ1QmhoSEowNzM2LnBuZyIgPsOXMTAwJT0xMSU=
