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【简答题】
(12分)经测定乙醇的化学式是C 2 H 6 O,由于有机物普遍存在同分异构现象,推测乙醇的结构可能是下列两种之一。 为测定其结构,应利用物质的特殊性进行定性、定量实验。现给出乙醇、钠、必要的仪器,请甲、位同学直接利用如图给定装置开始进行实验确定乙醇的结构。 (1)学生甲得到一组实验数据如上表: 乙醇的物质的量/mol 氢气的体积/L 0.10 1.12(标准状况) 根据以上数据推断乙醇的结构为 (用Ⅰ、Ⅱ表示),理由为 , 该反应的化学方程式为: 。 (2)同学乙分别准确称量4.60 g乙醇进行多次实验,结果发现以排在量筒内水的体积作为生成的H 2 体积,换算成标准状况后都小于1.12L,如果忽略量筒本身及读数造成的误差,那么乙认为可能是由于样品中含有少量水造成的,你认为正确吗? (填“正确”或“不正确”)。请说明你判断的理由 。 (3)实验后,两名同学从乙醇的可能结构分析入手,对乙醇和钠的量的关系进行了讨论,如果乙醇的物质的量为n mol,那么对钠的物质的量的取值要求必须是 n(填“大于”、“小于”或“等于”)。
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举一反三
【简答题】Which buildings of the Inner Court is the counterpart of the three halls of the Outer Court?
【单选题】What is the Outer Court composed of?
A.
the Hall of Supreme Harmony, the Hall of Mental Cultivation and the Hall of Preserving Harmony.
B.
the Hall of Supreme Harmony, the Hall of Central Harmony and the Hall of the Supreme Pole.
C.
the Hall of Mental Cultivation, the Hall of the Supreme Pole and the Hall of Preserving Harmony.
D.
the Hall of Supreme Harmony, the Hall of Central Harmony and the Hall of Preserving Harmony
【单选题】设某二叉树中共有140个结点,其中有40个度为1的结点。则()。
A.
该二叉树中有51个叶子结点
B.
该二叉树中有50个叶子结点
C.
该二叉树中有51个度为2的结点
D.
不可能有这样的二叉树
【多选题】The outer court of the Forbidden City includes: .
A.
Hall of Supreme Harmony
B.
Hall of Middle Harmony
C.
Hall of Union
D.
Hall of Preserving Harmony
【单选题】Which buildings of the Inner Court are the counterpart of the three halls of the Outer Court?
A.
The three gates .
B.
The Three Rear Palaces
C.
Six Eastern Palaces
D.
Six Western Palaces
【单选题】What is the Outer Court composed of?
A.
The Hall of Supreme Harmony, the Hall of Mental Cultivation and the Hall of Preserving Harmony.
B.
The Hall of Supreme Harmony, the Hall of Central Harmony and the Hall of the Supreme Pole.
C.
The Hall of Mental Cultivation, the Hall of the Supreme Pole and the Hall of Preserving Harmony.
D.
The Hall of Supreme Harmony, the Hall of Central Harmony and the Hall of Preserving Harmony.
【判断题】The Outer Court has ahigher ranking than the Inner Court.
A.
正确
B.
错误
【单选题】Which gate is to separate the inner court and outer court of the Forbidden City?
A.
the Gate of Hall of Heavenly Purity
B.
the Meridian Gate
C.
the Gate of Hall of Earthly Tranquility
D.
the Gate of Hall of Preserving Harmony
【判断题】he Outer Court and the Inner Court are separated by the Gate of Heavenly Purity.
A.
正确
B.
错误
【单选题】某二叉树共有150个结点,其中有50个度为1的结点,则()。
A.
不存在这样的二叉树。
B.
该二叉树有49个叶子结点。
C.
该二叉树有50个叶子结点。
D.
该二叉树有51个叶子结点。
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