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【简答题】
一化学研究性学习小组对某Na 2 CO 3 和NaHCO 3 的混合溶液（以下简称“样品溶液”）的组成进行探究．请按要求完成下列研究报告． 【资料获悉】36.5%的浓盐酸的密度为1.19g?cm -3 ． 【探究思路】用1.00mol?L -1 的稀盐酸测定样品溶液的组成． 【实验探究】用36.5%的浓盐酸配制1.00mol?L -1 的稀盐酸需要的玻璃仪器有烧杯、容量瓶、量筒、______． 取20.0mL样品溶液不断加入1.00mol?L -1 的稀盐酸，加入盐酸的体积和产生的现象见下表． 反应阶段 Ⅰ Ⅱ Ⅲ 盐酸体积x/mL 0＜x≤10.0 10.0＜x≤40.0 x＞40.0 现象 无气体 有气体 无气体 第I阶段溶液中反应的离子方程式为：______． 样品溶液中c（CO 3 2- ）=______． 【交流讨论】（1）如果将2.85g某Na 2 CO 3 和NaHCO 3 的固体混合物溶于水制成溶液，然后逐滴加入1.00mol?L -1 的稀盐酸并充分反应，若第Ⅰ阶段消耗盐酸的体积为15.0mL，当滴加到45.0mL时，反应的第Ⅱ阶段结束．则此Na 2 CO 3 和NaHCO 3 的混合物中Na 2 CO 3 的质量分数是多少？ （2）有同学认为，测定Na 2 CO 3 和NaHCO 3 固体混合物中Na 2 CO 3 的质量分数，完全不必将混合物配制成溶液，也不必要使用其他反应试剂，即可达到目的，则此时实验的主要操作方法的名称是称量和______，在实验中需要测定的数据有______．
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参考答案：
举一反三
【单选题】During his solo voyage, Chichester had _________ experienced fear like many other adventurers.
A.
doubtful
B.
doubtfully
C.
undoubtedly
查看完整题目与答案
【单选题】关于《山居秋暝》下列说法有误的一项是( )(1分)
A.
.首联“空山新雨后，天气晚来秋”把地点、时间、季节、环境全点出来了。
B.
.颔联“明月松间照，清泉石上流”一静一动，一光一声，先视觉，后听觉，写出了山间自然景物的幽静。
C.
.颈联“竹喧归浣女，莲动下渔舟”作者以动写静，以有声衬无声，先听觉后视觉，进一步突出了山间生活的幽静。
D.
全诗格调清新，富于生活气息，于诗情画意中寄托了诗人高尚的情怀和强烈的爱国主义思想感情。
查看完整题目与答案
【单选题】During his solo voyage, Chichester had ____________experienced fear like many other adventurers.
A.
doubtful
B.
doubtfully
C.
undoubtedly
D.
doubt
查看完整题目与答案
【单选题】He endured all kinds of hardships in his solo sailing around the world.
A.
suffered
B.
expected
C.
lasted
D.
overcame
查看完整题目与答案
【简答题】肺俞配中府,常用于胸闷、咳喘之症。该配穴属于按部配穴中的( )。
查看完整题目与答案
【单选题】According to the man，when was his worst accident?
A.
During the British Grand Prix.
B.
During the Mexican Grand Prix.
C.
On his way to the studio.
D.
During his last race.
查看完整题目与答案
【单选题】Which of the following statements is not true during the author's solo traveling?
A.
She ate ethnic food with four youthful Chinese salarymen on her way through estern Korea.
B.
She spent a long afternoon in Thailand all alone in the back of a hay wagon.
C.
For seven days, she took a truck with a Brit, two Aussies and two Nowegians.
D.
A Texas couple nursed her with chocolate bars and tissues in China.
查看完整题目与答案
【单选题】混凝过程中，pH曲线急剧下降、小幅上升、平缓延伸分别对应混凝的哪个阶段？
A.
凝聚 沉降 絮凝
B.
沉降 凝聚 絮凝
C.
絮凝 沉降 凝聚
D.
凝聚 絮凝 沉降
查看完整题目与答案
【单选题】According to the passage, which of the following is not true during the author’s solo travelling?
A.
She spent a long afternoon in Thailand all alone in the back of a hay wagon.
B.
For seven days she took a truck with a Brit, two Aussies and two Norwegians.
C.
A Texas couple nursed her with chocolate bars and tissues in China.
D.
She ate ethnic food with four youthful Chinese salarymen on her way through eastern Korea.
查看完整题目与答案
【单选题】下面哪一个选项不属于"单元格格式"对话框中数学标签的内容()
A.
字体
B.
货币
查看完整题目与答案
相关题目：
【单选题】During his solo voyage, Chichester had _________ experienced fear like many other adventurers.
A.
doubtful
B.
doubtfully
C.
undoubtedly
查看完整题目与答案
【单选题】关于《山居秋暝》下列说法有误的一项是( )(1分)
A.
.首联“空山新雨后，天气晚来秋”把地点、时间、季节、环境全点出来了。
B.
.颔联“明月松间照，清泉石上流”一静一动，一光一声，先视觉，后听觉，写出了山间自然景物的幽静。
C.
.颈联“竹喧归浣女，莲动下渔舟”作者以动写静，以有声衬无声，先听觉后视觉，进一步突出了山间生活的幽静。
D.
全诗格调清新，富于生活气息，于诗情画意中寄托了诗人高尚的情怀和强烈的爱国主义思想感情。
查看完整题目与答案
【单选题】During his solo voyage, Chichester had ____________experienced fear like many other adventurers.
A.
doubtful
B.
doubtfully
C.
undoubtedly
D.
doubt
查看完整题目与答案
【单选题】He endured all kinds of hardships in his solo sailing around the world.
A.
suffered
B.
expected
C.
lasted
D.
overcame
查看完整题目与答案
【简答题】肺俞配中府,常用于胸闷、咳喘之症。该配穴属于按部配穴中的( )。
查看完整题目与答案
【单选题】According to the man，when was his worst accident?
A.
During the British Grand Prix.
B.
During the Mexican Grand Prix.
C.
On his way to the studio.
D.
During his last race.
查看完整题目与答案
【单选题】Which of the following statements is not true during the author's solo traveling?
A.
She ate ethnic food with four youthful Chinese salarymen on her way through estern Korea.
B.
She spent a long afternoon in Thailand all alone in the back of a hay wagon.
C.
For seven days, she took a truck with a Brit, two Aussies and two Nowegians.
D.
A Texas couple nursed her with chocolate bars and tissues in China.
查看完整题目与答案
【单选题】混凝过程中，pH曲线急剧下降、小幅上升、平缓延伸分别对应混凝的哪个阶段？
A.
凝聚 沉降 絮凝
B.
沉降 凝聚 絮凝
C.
絮凝 沉降 凝聚
D.
凝聚 絮凝 沉降
查看完整题目与答案
【单选题】According to the passage, which of the following is not true during the author’s solo travelling?
A.
She spent a long afternoon in Thailand all alone in the back of a hay wagon.
B.
For seven days she took a truck with a Brit, two Aussies and two Norwegians.
C.
A Texas couple nursed her with chocolate bars and tissues in China.
D.
She ate ethnic food with four youthful Chinese salarymen on her way through eastern Korea.
查看完整题目与答案
【单选题】下面哪一个选项不属于"单元格格式"对话框中数学标签的内容()
A.
字体
B.
货币
查看完整题目与答案
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