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由几种离子化合物组成的混合物，含有以下离子中的若干种：K + 、Cl - 、NH +4 、Mg 2+ 、CO 2-3 、Ba 2+ 、SO 2-4 ．将该混合物溶于得澄清溶液，现取3份100mL该溶液分别进行如下实验： 实验 序号 实验内容 实验结果 1 加AgNO 3 溶液 有白色沉淀生成 2 加足量NaOH溶液并加热 收集到气体1.12L（已折算成标准状况下的体积） 3 加足量BaCl 2 溶液时，对所得沉淀进行洗涤、干燥、称量；再向沉淀中加足量稀盐酸，然后干燥、称量 第一次称量读数为6.27g，第二次称量读数为2.33g 试回答下列问题： （1）根据实验1对Cl - 是否存在的判断是______（填“一定存在”“一定不存在”或“不能确定”）；根据实验1～3判断混合物中一定不存在的离子是______． （2）试确定溶液中一定存在的阴离子及其物质的量浓度（可不填满）： 阴离子符号 物质的量浓度（mol/L） ______ ______ ______ ______ （3）试确定K + 是否存在？______，判断的理由是______．
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参考答案：
举一反三
【单选题】数控机床的切削精度检验包括(　 　)。
A.
镗孔精度
B.
镗孔的孔距精度和孔径精度
C.
端面铣刀铣平面的精度
D.
这些都是
查看完整题目与答案
【判断题】三部门宏观经济的均衡条件:C+I+G=C+S+T,即I=S+(T-G)
A.
正确
B.
错误
查看完整题目与答案
【单选题】If she spends all of her income on breadfruits and melons, Natalie can just afford 9 breadfruits and 10 melons per day. She could also use her entire budget to buy 3 breadfruits and 12 melons per day....
A.
313 yen
B.
317 yen
C.
312 yen
D.
309 yen
查看完整题目与答案
【单选题】下列关于三部门宏观经济均衡条件的说法中，正确的是（ ）。
A.
储蓄=投资
B.
储蓄+政府的净税收收入=政府购买+投资
C.
储蓄+政府的净税收收入+政府购买=投资
D.
储蓄=政府的净税收收入+政府购买+投资
查看完整题目与答案
【判断题】There are two goods. You know how much of good 1 a consumer can afford if she spends all of her income on good 1. If you know the ratio of the prices of the two goods, then you could draw the consumer...
A.
正确
B.
错误
查看完整题目与答案
【单选题】If she spends all of her income on breadfruits and melons, Natalie can just afford 9 breadfruits and 10 melons per day. She could also use her entire budget to buy 3 breadfruits and 12 melons per day....
A.
313
B.
317
C.
409
D.
None of the above.
查看完整题目与答案
【单选题】Phyllis spends her income on beer and pretzels, and a six pack of beer costs the same as a bag of pretzels. If she is in consumer equilibrium, we know:
A.
she buys the same quantities of six packs of beer and bags of pretzels.
B.
she gets the same marginal utility from the last six pack of beer as from the last bag of pretzels.
C.
she gets the same total utility from beer as she does from pretzels.
D.
that all of the above are true.
查看完整题目与答案
【单选题】If she spends all of her income on uglifruit and breadfruits, Maria can just afford 11 uglifruit and 4 breadfruits per day. She could also use her entire budget to buy 3 uglifruit and 8 breadfruits pe...
A.
115 pesos
B.
119 pesos
C.
114 pesos
D.
105 pesos
查看完整题目与答案
【单选题】If she spends all of her income on lemons and tangerines, Isabella can just afford 30 lemons and 8 tangerines per day. She could also use her entire budget to buy 6 lemons and 14 tangerines per day. T...
A.
372 guineas
B.
377 guineas
C.
371 guineas
D.
363 guineas
查看完整题目与答案
【单选题】1924 年出版了第一本由我国学者编著的《教育心理学》教科书。这本书的作者是
A.
廖世承
B.
陆志韦
C.
潘菽
D.
陈选善
查看完整题目与答案
相关题目：
【单选题】数控机床的切削精度检验包括(　 　)。
A.
镗孔精度
B.
镗孔的孔距精度和孔径精度
C.
端面铣刀铣平面的精度
D.
这些都是
查看完整题目与答案
【判断题】三部门宏观经济的均衡条件:C+I+G=C+S+T,即I=S+(T-G)
A.
正确
B.
错误
查看完整题目与答案
【单选题】If she spends all of her income on breadfruits and melons, Natalie can just afford 9 breadfruits and 10 melons per day. She could also use her entire budget to buy 3 breadfruits and 12 melons per day....
A.
313 yen
B.
317 yen
C.
312 yen
D.
309 yen
查看完整题目与答案
【单选题】下列关于三部门宏观经济均衡条件的说法中，正确的是（ ）。
A.
储蓄=投资
B.
储蓄+政府的净税收收入=政府购买+投资
C.
储蓄+政府的净税收收入+政府购买=投资
D.
储蓄=政府的净税收收入+政府购买+投资
查看完整题目与答案
【判断题】There are two goods. You know how much of good 1 a consumer can afford if she spends all of her income on good 1. If you know the ratio of the prices of the two goods, then you could draw the consumer...
A.
正确
B.
错误
查看完整题目与答案
【单选题】If she spends all of her income on breadfruits and melons, Natalie can just afford 9 breadfruits and 10 melons per day. She could also use her entire budget to buy 3 breadfruits and 12 melons per day....
A.
313
B.
317
C.
409
D.
None of the above.
查看完整题目与答案
【单选题】Phyllis spends her income on beer and pretzels, and a six pack of beer costs the same as a bag of pretzels. If she is in consumer equilibrium, we know:
A.
she buys the same quantities of six packs of beer and bags of pretzels.
B.
she gets the same marginal utility from the last six pack of beer as from the last bag of pretzels.
C.
she gets the same total utility from beer as she does from pretzels.
D.
that all of the above are true.
查看完整题目与答案
【单选题】If she spends all of her income on uglifruit and breadfruits, Maria can just afford 11 uglifruit and 4 breadfruits per day. She could also use her entire budget to buy 3 uglifruit and 8 breadfruits pe...
A.
115 pesos
B.
119 pesos
C.
114 pesos
D.
105 pesos
查看完整题目与答案
【单选题】If she spends all of her income on lemons and tangerines, Isabella can just afford 30 lemons and 8 tangerines per day. She could also use her entire budget to buy 6 lemons and 14 tangerines per day. T...
A.
372 guineas
B.
377 guineas
C.
371 guineas
D.
363 guineas
查看完整题目与答案
【单选题】1924 年出版了第一本由我国学者编著的《教育心理学》教科书。这本书的作者是
A.
廖世承
B.
陆志韦
C.
潘菽
D.
陈选善
查看完整题目与答案
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