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【简答题】
如图为实验室中常见的气体制备、干燥、收集和性质实验的部分仪器.试根据题目要求,回答下列问题: (1)某同学以锌粒和稀盐酸为原料在实验室制备、收集纯净干燥的氢气,选择仪器连接装置后,检查装置的气密性. 1所选装置的连接顺序为________. 2若要验证氢气的可燃性,在点燃氢气之前一定要________. 3写出该同学制备氢气发生反应的化学方程式________. (2)若以H 2 O 2 溶液和MnO 2 在实验室中制备干燥的氧气,并用来测定B装置中盛有的Cu和C混合物中Cu的含量,取a g混合物样品放入装置B的硬质玻璃,所选仪器连接顺序为:A-D-B-C,试回答下列问题: 1仪器D的作用是________. 2仪器B中的现象是________. 3若通入足量氧气充分反应后,测得B装置中硬质玻璃管内固体的质量在反应前后无变化,则原混合物中Cu的质量是________g.(计算结果可为分数形式) 4欲用化学方法证明硬质玻璃管内的固体在通入氧气后完全发生了反应,请设计实验方案,并简述操作步骤、现象和结论________.
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举一反三
【单选题】如果生产过程中使用的两种投入品具有互补关系，则
A.
投入品不能同时使用
B.
投入品既可能是总互补，也可能是总替代关系
C.
投入品是总互补关系
D.
投入品是总替代关系
【单选题】However, scientists are delighted by the discovery, because the engineers were all very educated people and scientists feel they can ______ what they described. [ ]
A.
rely on
B.
deal with
C.
write down
D.
pass on
【简答题】SS3B型机车的电气制动包括有电阻制动和( )。
【单选题】What did Beethoven, Gothe and Schiller have in common with Hitler?
A.
They were all evil people.
B.
They were all civilized people.
C.
They lived in the same time and had similar beliefs.
D.
They were all from Germany, a civilized society.
【单选题】—Were all the three people in thecar injured in the accident? —No, only the two passengers whogot hurt.
A.
it was
B.
there was
C.
there were
D.
there had
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