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.下列有关Na2CO3和NaHCO3性质的比较中，正确的是
| A: 等浓度的溶液中滴入稀盐酸，放出气体的快慢Na2CO3＜NaHCO3 |
| B: 热稳定性Na2CO3＜NaHCO3 |
| C: 常温时水溶性Na2CO3＜NaHCO3 |
| D: 相对分子质量Na2CO3＜NaHCO3 |
一次做对，真牛！
+5奖励规则>
- 提示1：56Kz6YW46ZKg55qE5rC05rq25oCn5aSn5LqO56Kz6YW45rCi6ZKg77yb
- 答案：QQ==
Qe+8jua1k+W6pueahOa6tua2suS4rea7tOWFpeeogOebkOmFuO+8jOaUvuWHuuawlOS9k+eahOW/q+aFok5hPHN1Yj4yPC9zdWI+Q088c3ViPjM8L3N1Yj7vvJxOYUhDTzxzdWI+Mzwvc3ViPu+8jOaVhUHmraPnoa7vvJs8YnI+Qu+8jk5hSENPPHN1Yj4zPC9zdWI+5LiN56iz5a6a77yM5Yqg54Ot5piT5YiG6Kej77yaMk5hSENPPHN1Yj4zPC9zdWI+PGltZyB3aWR0aD01MCBoZWlnaHQ9Mzcgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC9DQi8zRS9yQkFDSjFZekVtakMtXy1RQUFBQmJlNmNhQlk0MzEucG5nIiA+TmE8c3ViPjI8L3N1Yj5DTzxzdWI+Mzwvc3ViPitDTzxzdWI+Mjwvc3ViPuKGkStIPHN1Yj4yPC9zdWI+T++8jOeis+mFuOmSoOWPl+eDreeos+Wumu+8jOaJgOS7peeDreeos+WumuaAp++8mk5hPHN1Yj4yPC9zdWI+Q088c3ViPjM8L3N1Yj7vvJ5OYUhDTzxzdWI+Mzwvc3ViPu+8jOaVhULplJnor6/vvJs8YnI+Q++8juW4uOa4qeS4i+ebuOWQjOeahOa6tuWJguaXtu+8jE5hPHN1Yj4yPC9zdWI+Q088c3ViPjM8L3N1Yj7nmoTmurbop6PluqblpKfkuo5OYUhDTzxzdWI+Mzwvc3ViPueahOa6tuino+W6pu+8jOaVhUPplJnor6/vvJs8YnI+RO+8jueis+mFuOmSoOeahOebuOWvueWIhuWtkOi0qOmHj+S4ujEwNu+8jOeis+mFuOawoumSoOeahOebuOWvueWIhuWtkOi0qOmHj+S4ujg077yM5omA5Lul55u45a+55YiG5a2Q6LSo6YePTmE8c3ViPjI8L3N1Yj5DTzxzdWI+Mzwvc3ViPu+8nk5hSENPPHN1Yj4zPC9zdWI+77yM5pWFROmUmeivr++8mzxicj7mlYXpgInvvJpB77yO
本课配套习题挑战模式2/5
单选题
难度系数：
2.加热纯碱和小苏打的混合物20克，至质量不再变化为止，冷却后称量其固体质量是13 .8克，则原混合物中纯碱的质量分数是
| A: 84% |
| B: 8.4% |
| C: 1.6% |
| D: 16% |
一次做对，真牛！
+5奖励规则>
- 提示1：Mk5hSENPPHN1Yj4zPC9zdWI+PGltZyB3aWR0aD0zMSBoZWlnaHQ9Mjggc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC9DQi8wNi9yQkFDSmxZekVrYkNGRDdzQUFBQkg4R1FpUlEzMzYucG5nIiA+TmE8c3ViPjI8L3N1Yj5DTzxzdWI+Mzwvc3ViPu+8i0g8c3ViPjI8L3N1Yj5P77yLQ088c3ViPjI8L3N1Yj7ihpHvvIzotKjph4/nmoTlh4/lsJHliJrlpb3mmK/msLTlkozkuozmsKfljJbnorPnmoTotKjph4/jgII=
- 答案：RA==
PGltZyB3aWR0aD0zMjIgaGVpZ2h0PTgyIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvQ0IvMDYvckJBQ0psWXpFa2JBZmJXOEFBQUpJYTRMdmp3NzY1LnBuZyI+PGJyPuino+W+l++8mm09MTYuOGc8YnI+PGltZyB3aWR0aD0yNDAgaGVpZ2h0PTQ1IHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvQ0IvM0UvckJBQ0oxWXpFa2FBb1NMYUFBQUYteEpycWxrMDg1LnBuZyI+
本课配套习题挑战模式3/5
单选题
难度系数：
3.将Na2CO3·1OH2O和NaHCO3的混合物ng溶于水制成200ml溶液，C（Na+）=0．5mol/L,若将混合物ng加热至质量不再改变时，减少质量可能为
| A: 3．1g |
| B: 5．3g |
| C: 9．0g |
| D: 11．0g |
一次做对，真牛！
+5奖励规则>
- 提示1：5YiG5Yir6K6+TmE8c3ViPjI8L3N1Yj5DTzxzdWI+Mzwvc3ViPsK3MU9IPHN1Yj4yPC9zdWI+T+WSjE5hSENPPHN1Yj4zPC9zdWI+55qE54mp6LSo55qE6YeP5Li6eCBtb2zjgIEgeSBtb2zvvJvliJnlj6/ku6XmoLnmja7mgLvotKjph4/lkozpkqDnprvlrZDnmoTkuKrmlbDliJfmlrnnqIvvvIzmsYLlh7rmnKrnn6XmlbDjgII=
- 答案：Qg==
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
本课配套习题挑战模式4/5
单选题
难度系数：
4.两种钠盐混合、分装于两只试管中．其中一支加热产生CO2气体，另一支加水也产生CO2气体．这两种盐可能是
| A: Na2CO3和NaHSO4 |
| B: Na2CO3和NaHCO3 |
| C: NaHCO3和NaHSO4 |
| D: NaHCO3和Na2SO4 |
一次做对，真牛！
+5奖励规则>
- 提示1：5rOo5oSP5pys6aKY55qE6aKY5bmy5piv4oCc5Lik6ICF55qE5re35ZCI54mp4oCd5YiG572u5LqO6K+V566h5Lit44CC5Yqg5rC05Lqn55Sf5LqM5rCn5YyW56Kz5piv5Zug5Li65Zyo5rq25ray5Lit5Lik6ICF5Y+R55Sf5Y+N5bqU44CC
- 提示2：56Gr6YW45rCi6ZKg5rq25LqO5rC05LmL5ZCO55S156a75Ye65rCi56a75a2Q77yM55u45b2T5LqO5LiA5Liq5LiA5YWD6YW444CC
- 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.碳酸氢钠受热容易分解为碳酸钠．现加热5.00g的碳酸钠和碳酸氢钠的混合物，使碳酸氢钠完全分解，混合物质量减少了0.31g，则混合物中碳酸钠的质量为
| A: 3.38 g |
| B: 4.58 g |
| C: 4.16 g |
| D: 4.41 g |
一次做对，真牛！
+5奖励规则>
- 提示1：5Yqg54Ot56Kz6YW46ZKg5ZKM56Kz6YW45rCi6ZKg55qE5re35ZCI54mp77yM56Kz6YW45rCi6ZKg5a6M5YWo5YiG6Kej77yM5qC55o2u5Y+N5bqU55qE5pa556iL5byPMk5hSENPPHN1Yj4zPC9zdWI+PGltZyB3aWR0aD01MCBoZWlnaHQ9Mzcgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC9DQi8zRS9yQkFDSjFZekVsLVJTcXBUQUFBQmNBNUhhQlUwMjcucG5nIiA+TmE8c3ViPjI8L3N1Yj5DTzxzdWI+Mzwvc3ViPitDTzxzdWI+Mjwvc3ViPuKGkStIPHN1Yj4yPC9zdWI+T++8jOWIqeeUqOW3rumHj+azleiuoeeul+eis+mFuOawoumSoOeahOi0qOmHj++8jOi/m+iAjOiuoeeul+eis+mFuOmSoOi0qOmHj++8jg==
- 答案：Qw==
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
