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【简答题】
工业制得的氮化铝(AlN)产品中常含有少量Al 4 C 3 、Al 2 O 3 、C等杂质。某同学设计了如下实验分别测定氮化铝(AlN)样品中AlN和Al 4 C 3 的质量分数(忽略NH 3 在强碱性溶液中的溶解)。 (1)实验原理 ①Al 4 C 3 与硫酸反应可生成CH 4 ; ②AlN溶于强酸生成铵盐,溶于氢氧化钠溶液生成氨气,请写出AlN与NaOH溶液反应的化学方程式____。 (2)实验装置(如图所示) (3)实验过程 ①连接实验装置,检验装置的气密性。称得D装置的质量为n g,滴定管的读数为a mL。 ②称取m g AlN样品置于锥形瓶中;塞好胶塞,关闭活塞____,打开活塞____,通过分液漏斗加入过量____(填化学式),与锥形瓶内物质充分反应。 ③待反应进行完全后,关闭活塞____,打开活塞____,通过分液漏斗加入过量____(填化学式),与锥形瓶内物质充分反应。 ④____(填入该进行的操作)。 ⑤记录滴定管的读数为b mL,称得D装置的质量为p g。 (4)数据分析 ①AlN的质量分数为____。 ②若读取滴定管中气体的体积时,液面低,则所测气体的体积____(填“偏大”“偏小”或“无影响”)。 ③Al 4 C 3 的质量分数为____。(该实验条件下的气体摩尔体积为V m )
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【单选题】____ is a phenomenon that in some speech communities two languages exist side by side with each having a different role to play; and language switching occurs when the situation changes.
A.
Bilingualism
B.
Diglossia
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【单选题】Trust is a phenomenon that_.
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results from our experiences with others
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A.
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