问题 填空题

(3分)某气体中可能含有CO、CO2、N2和H2中的一种或几种。先将该气体通过澄清石灰水没出现浑浊;再将该气体在空气中点燃,在其火焰上方罩一个冷而干燥的小烧杯,其内壁无水珠生成,向小烧杯中倒入少量澄清石灰水振荡后,出现浑浊现象。试用化学式回答:原气体中一定含有_______,一定不含_______,可能含有_______。

答案

CO ; CO2; N2

题目分析:某气体中可能含有CO、CO2、N2和H2中的一种或几种。先将该气体通过澄清石灰水没出现浑浊,说明该气体中没有CO2;再将该气体在空气中点燃,在其火焰上方罩一个冷而干燥的小烧杯,其内壁无水珠生成,向小烧杯中倒入少量澄清石灰水振荡后,出现浑浊现象,说明气体中一定含有CO,一定没有H2;但氮气的有无不能确定。2、N2和H2的性质。

点评:鉴别物质,要根据其特有的性质来设计实验,根据不同实验现象来区别。

选择题

[化学—物质结构与性质](13分)

Ⅰ.现今运动场馆大量的照明材料或屏幕都使用了发光二极管(LED)。目前市售LED晶片,材质基本以GaAs(砷化镓)、InGaN(氮化铟镓)为主。砷化镓作为第三代半导体,以其为材料制造的灯泡寿命长,耗能少。

已知砷化镓的晶胞结构如图所示。请回答下列问题:

(1)下列说法正确的是             (填字母序号)。                           

a.砷化镓晶胞结构与NaCl相同    b.第一电离能:As>Ga

c.电负性:As>Ga               d.砷化镓晶体中含有配位键                                           

e.GaP与GaAs互为等电子体

(2)AsH3空间构型为__ __;砷化镓可由(CH3)3Ga 和AsH3在700℃时制得,(CH3)3Ga中镓原子的杂化方式为         

Ⅱ. 金属铜的导电性仅次于银,居金属中的第二位,大量用于电气工业。

(3)Cu的价电子排布式为__________;请解释金属铜能导电的原因                     

(4)在硫酸铜溶液中通入过量的氨气,小心蒸发,最终得到深蓝色的[Cu(NH3)4]SO4晶体,晶体中

含有的化学键除普通共价键外,还有                。已知NF3与NH3的空间构型都是三角锥形,单NF3不易与Cu2+形成配离子,其原因是                               

问答题

Turkey’s Bodrum peninsula is different. The tourist boom in this part of the world (1) turned some small villages into resorts yet left neighbouring beaches undisturbed, making it quite (2) southern France or the Spanish Coasts where few stretches of coastline are undevelopeD.
The (3) for this happy set of circumstances is simple. For thousands of years, travel here (4) easier by boat than by lanD.So when mass tourism arrived in the (5) 1980s, there was no coast road for ribbon development to follow. So the peninsula, just (6) hour from Bodrum airport, has not become one long littoral of resort.
The building (7) new hotels has mainly been confined to places easily reached by then relatively (8) roads. Such ease of access has made Gumbet, near Bodrum, a busy resort, while the little fishing village of Gumusluk, 12 miles further west and only recently reachable by (9) , remains tranquil and undisturbeD.
It’s worth thinking carefully about location when planning a family (10) on the peninsulA.Choose a place that is centrally located, preferably out of earshot (11) Bodrum town’s "lively"—which means nosy—nightlife, and you can then use (12) area’s comfortably small scale to your advantage. Today’s new roads mean most places can (13) reached in under an hour by taxi or the ubiquitous dolmus-minibus.
The (14) of facilities at the Tamarisk Beach Hotel near the small village of Ortakent makes (15) a good base. The family-run hotel—rooms and suites are in two-storey buildings (16) by palm trees and flowers in terracotta pots—sits above its own sandy (17) beach, shaded by tamarisk trees and sheltered by nearby islands.
The hotel is (18) child-friendly, too. Children, from infants up to young teenagers, can take part in a (19) of games and activities that include tuition in windsurfing, dinghy (20) catamaran sailing.