本课配套习题挑战模式1/5
单选题
难度系数:
1.泡沫灭火器内装的药液之一是饱和NaHCO3溶液,而不选用更廉价的饱和Na2CO3溶液。其原因是( )
①NaHCO3比Na2CO3稳定,便于长期保存
②NaHCO3与酸反应产生气泡比Na2CO3快
③质量相同的两种钠盐,NaHCO3与足量酸反应产生CO2气体多
④产生相同质量的CO2,消耗的酸量NaHCO3比Na2CO3少
①NaHCO3比Na2CO3稳定,便于长期保存
②NaHCO3与酸反应产生气泡比Na2CO3快
③质量相同的两种钠盐,NaHCO3与足量酸反应产生CO2气体多
④产生相同质量的CO2,消耗的酸量NaHCO3比Na2CO3少
A: ②③④ |
B: ①②③④ |
C: ①②③ |
D: ①③④ |
一次做对,真牛!
+5奖励规则>
- 提示1:56Kz6YW45rCi6ZKg55qE56iz5a6a5oCn5byx5LqO56Kz6YW46ZKg55qE77yM4pGg5LiN5q2j56Gu
- 答案:QQ==
56Kz6YW45rCi6ZKg55qE56iz5a6a5oCn5byx5LqO56Kz6YW46ZKg55qE77yM4pGg5LiN5q2j56Gu77yM5pWF6YCJQeOAgg==
本课配套习题挑战模式2/5
单选题
难度系数:
2.纯碱和小苏打是厨房中两种常见用品,它们都是白色固体,下列区分它们的说法正确的是
A: 先将两样品配成溶液,分别加入澄清石灰水,无白色沉淀生成的是小苏打 |
B: 用洁净铁丝蘸取两种样品在煤气灯火焰上灼烧,火焰颜色为黄色的是小苏打 |
C: 分别用炒锅加热两种样品,全部分解挥发,没有残留物的是小苏打 |
D: 用两只小玻璃杯,分别加入少量的两种样品,再加入等浓度的食醋,产生气泡速率较快的是小苏打 |
一次做对,真牛!
+5奖励规则>
- 提示1:56Kz6YW46ZKg5LiO56Kz6YW45rCi6ZKg6YO95Lya5LiO5rCi5rCn5YyW6ZKZ5Y+N5bqU55Sf5oiQ56Kz6YW46ZKZ44CC
- 答案:RA==
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本课配套习题挑战模式3/5
单选题
难度系数:
3.下列有关Na2CO3和NaHCO3性质的比较中,正确的是
A: 固体的热稳定性:Na2 CO3>NaHCO3 |
B: 与稀盐酸反应放出气体的快慢:Na2CO3>NaHCO3 |
C: 106gNa2CO3和84gNaHCO3分别与过量的盐酸反应,放出CO2的质量:Na2CO3>NaHCO3 |
D: 在Na2CO3和NaHCO3的稀溶液中,加CaCl2溶液都有白色沉淀生成 |
一次做对,真牛!
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- 答案:QQ==
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
本课配套习题挑战模式4/5
单选题
难度系数:
4.下列关于 Na2CO3和NaHCO3性质比较中正确的是
A: 热稳定性:Na2CO3< NaHCO3 |
B: 常温时水溶解性:Na2CO3<NaHCO3 |
C: 等质量时与盐酸反应产生CO2的质量:Na2CO3<NaHCO3 |
D: 与同浓度稀盐酸反应快慢:NaHCO3<Na2CO3 |
一次做对,真牛!
+5奖励规则>
- 提示1:5pys6aKY6L6D5Li6566A5Y2V77yM5rOo5oSPQ+mhueaYr+WQjOi0qOmHj++8jOiAjOS4jeaYr+eJqei0qOeahOmHj+OAgg==
- 答案:Qw==
56Kz6YW45rCi6ZKg5Yqg54Ot5Y+R55Sf5YiG6Kej77yM56Kz6YW46ZKg5Yqg54Ot5LiN5YiG6Kej77yMQemUmeivr++8mzxicj7luLjmuKnml7bnorPphbjmsKLpkqDmurbop6PluqblsI/kuo7norPphbjpkqDvvIxC6ZSZ6K+v77ybPGJyPuetiei0qOmHj+eis+mFuOmSoOS4jueis+mFuOawoumSoOS4jui2s+mHj+ebkOmFuOWPjeW6lOeUn+aIkOS6jOawp+WMlueis+eis+mFuOawoumSoOWkmu+8jEPmraPnoa7vvJs8YnI+5LiO5ZCM5rWT5bqm55uQ6YW45Y+N5bqU5pe256Kz6YW45rCi6ZKg5q+U56Kz6YW46ZKg5b+r44CC
本课配套习题挑战模式5/5
单选题
难度系数:
5.下面关于Na2CO3和NaHCO3性质的叙述,正确的是
A: 受热时NaHCO3比Na2CO3稳定 |
B: 在水中NaHCO3比Na2CO3溶解性大 |
C: 质量相等的Na2CO3和NaHCO3分别与足量盐酸反应,NaHCO3放出的CO2比Na2CO3多 |
D: 物质的量相等的Na2CO3和NaHCO3分别与足量盐酸反应,NaHCO3放出的CO2比Na2CO3多 |
一次做对,真牛!
+5奖励规则>
- 提示1:5rOo5oSP5Yy65YiG6LSo6YeP55u4562J5LiO54mp6LSo55qE6YeP55u4562J44CC
- 答案:Qw==
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