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【简答题】
氨在国民经济中占有重要地位. (1)合成氨工业中,合成塔中每生成2mol NH 3 ,放出92.2kJ热量. ①工业合成氨的热化学方程式是______. ②若起始时向容器内放入2mol N 2 和6mol H 2 ,达平衡后放出的热量为Q,则Q______(填“>”、“<”或“=”)184.4kJ. ③已知:(如图1所示) 1mol N-H键断裂吸收的能量约等于______kJ. (2)工业生产尿素的原理是以NH 3 和CO 2 为原料合成尿素[CO(NH 2 ) 2 ],反应的化学方程式为2NH 3 (g)+CO 2 (g)?CO(NH 2 ) 2 (l)+H 2 0(l),该反应的平衡常数和温度的关系如表所示: T/℃ 165 175 185 195 K 111.9 74.1 50.6 34.8 ①△H______(填“>”、“<”或“=”)0. ②在一定温度和压强下,若原料气中的NH 3 和CO 2 的物质的量之比(氨碳比) n(N H 3 ) n(C O 2 ) =x ,碳比(x)与CO 2 平衡转化率(α)的关系如图2所示.α 随着x增大而增大的原因是______. ③图2中的B点处,NH 3 的平衡转化率为______.
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【单选题】A frail, elderly man, suspected of having widespread cancer of the lungs and bronchi, is brought in for bronchoscopic examination. The instrument is inserted into the airway, where it accidentally pun...
A.
Azygos vein
B.
Left brachiocephalic artery
C.
Pericardiacophrenic artery
D.
Right pulmonary vein
E.
Superior vena cava
【判断题】陕西省是我国历史上建都朝代最多、时间最长的省份。
A.
正确
B.
错误
【单选题】以下两两颜色混合后出现什么颜色?
A.
橙,红,绿
B.
橙,绿,紫
C.
橙,紫,绿
D.
橘,绿,蓝
【简答题】(14分)某研究性学习小组设想将少量Cl 2 通入Fe 2+ 和I - 的混合溶液,来探究Fe 2+ 和I - 的还原性强弱。 【提出假设】 假设1: ; 假设2: ; 假设3:Fe 2+ 和I - 的还原性一样强。 【验证假设】 ⑴利用以下装置进行试验, 实验必需的装置是:A (按氯气流向的顺序用序号书写) ⑵实验开始后,控制通入少量氯气,通过观察溶液颜色的变化, (能或不能)判断反应的先后顺序...
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Square A.
B.
Square B.
C.
Square C.
D.
Square D.
【单选题】是我国历史上建都朝代最多、时间最长的省份。
A.
河南
B.
陕西
C.
江苏
D.
河北
【单选题】Section C Passage Directions: In this section, you will hear three passages. At the end of each passage, you will hear three or four questions. Both the passage and the questions will be spoken only o...
A.
It has kept growing over the centuries.
B.
Its top is hidden in clouds of volcanic smoke.
C.
Its height changes with each volcanic eruption.
D.
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【多选题】罐式仓库通常程球形或柱形,主要是用来储存( )
A.
石油
B.
天然气
C.
固体化工品
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【简答题】Who invented the earliest instrument to tell people where earthquakes happened?
【单选题】Section C Passage Directions: In this section, you will hear three passages。 At the end of each passage, you will hear three or four questions。 Both the passage and the questions will be spoken only o...
A.
It has kept growing over the centuries.
B.
Its top is hidden in clouds of volcanic smoke.
C.
Its height changes with each volcanic eruption.
D.
It has a recorded history of 1,500 years.
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