问题 填空题

(1)下列关于工业生产说法正确的是            。(填序号)

A.在侯氏制碱工业中,向饱和氯化钠溶液中先通二氧化碳,后通氨气

B.在硫酸工业、合成氨工业、硝酸工业中,皆采用循环操作提高原料利用率

C.在氯碱工业,电解槽被离子交换膜隔成阴极室和阳极室

D.工业上采用电解熔融氯化铝的方法制取金属铝E.石油裂化属于化学变化,主要目的是为了获得短链不饱和气态烃

(2)我国规定饮用水质量标准规定必须符合下表中要求:

pHCa2+ 、Mg2+总浓度细菌总数
6.5~8.5< 0.004 5 mol·L-1<100个·mL-1
 

以下是原水处理成自来水的工艺流程示意图:

①原水中含Ca2+ 、Mg2+ 、HCO3-、Cl-等,加入石灰生成Ca(OH)2,进而发生若干复分解反应,写出其中的离子方程式(只要求写出两个):                                

②FeSO4·7H2O是常用的凝聚剂,它在水中最终生成                        沉淀;通入二氧化碳的目的是                                  

③气体A的作用是         ,下列物质中          可以作为气体A的代用品(填编号)。

a.ClO2      b.浓氨水       c.K2FeO4        d.SO2       e.漂白粉

答案

(15分)(1)BC(2分)(2)①HCO3+OH-=CO32+H2O,     Mg2+ +2OH-=Mg(OH)2

Ca2+ + HCO3+OH-=CaCO3↓+H2O (任选其二,其他合理写法也对,每空2分)

②胶状Fe(OH)3 (2分); 除去Ca2+ ; 调节pH  (每空2分)

③杀菌消毒 (1分) ;  a c e (2分)

题目分析:(1)A、因为氨气溶解度非常大,先通氨气后通二氧化碳,能增大二氧化碳的吸收,有利于生成纯碱,故A步正确;

B、化学反应产物的循环利用可以提高原料利用率,故B正确;

C、电解饱和食盐水时,在阴极上产生的是氢气和氢氧化钠,在阳极上产生的是氯气,采用离子交换膜法,可防止阳极室产生的C12进入阴极室,所以选项C正确;

D、氯化铝是共价化合物,熔融时不能导电,所以工业上采用电解熔融氧化铝的方法制取金属铝,D不正确;

E、石油裂化属于化学变化,主要目的是为了提高汽油的产量和质量,E不正确,答案选BC。

(2)①氢氧化钙是强碱,能和氯化镁反应生成氯化钙和氢氧化镁沉淀,化学反应的离子方程式是Mg2+ +2OH-=Mg(OH)2↓;氢氧化钙也能和HCO3反应生成CO32,进而生成碳酸钙沉淀,反应的离子方程式是HCO3+OH-=CO32+H2O和Ca2+ + HCO3+OH-=CaCO3↓+H2O。

②亚铁离子具有还原性,易被氧化生成铁离子,铁离子水解生成氢氧化铁胶体,所以FeSO4·7H2O在水中最终生成胶状Fe(OH)3沉淀。CO2是酸性氧化物,反应中氢氧化钙过量,所以通入CO2的目的是除去过量的Ca2+和调节溶液的pH。

③气体A的作用是杀菌消毒,其中具有强氧化性的物质是ClO2 、K2FeO4、漂白粉,所以可以代替A的消毒剂是选项ace。

选择题
填空题

Monday’s Supreme Court decision to block a class-action sex-discrimination lawsuit against Wal-Mart was a huge setback for as many as 1.6 million current and former female employees of the world’s largest retailer. But the decision has consequences that range far beyond sex discrimination or the viability of class-action suits.

The underlying issue, which the Supreme Court has now ratified, is Wal-Mart’s authoritarian style, by which executives pressure store-level management to squeeze more and more from millions of clerks, stockers and lower-tier managers.

(41) ______.

In the 1950s and ’60s, northwest Arkansas, where Wal-Mart got its start, was poor, white and rural, in the midst of a wave of agricultural mechanization that generated a huge surplus of unskilled workers. To these men and women, the burgeoning chain of discount stores founded by Sam Walton was a godsend. The men might find dignity managing a store instead of a hardscrabble farm, while their wives and daughters could earn pin money clerking for Mr. Sam. "The enthusiasm of Wal-Mart associates toward their jobs is one of the company’s greatest assets," declared the firm’s 1973 annual report.

(42) ______.

Wal-Mart attorneys have argued, and the Supreme Court agreed this week, that even if sex discrimination was once part of the company’s culture, it is now ancient history: if any store managers are guilty of bias when it comes to promoting women, they are at odds with corporate policy. Wal-Mart is no longer an Ozark company; it is a cosmopolitan, multinational operation.

But that avoids the more essential point, namely that Wal-Mart views low labor costs and a high degree of workplace flexibility as a signal competitive advantage. It is a militantly anti-union company that has been forced to pay hundreds of millions of dollars to current and former employees for violations of state wage and hour laws.

There are tens of thousands of experienced Wal-Mart women who would like to be promoted to the first managerial rung, salaried assistant store manager. (43) ______.

Why Because, for all the change that has swept over the company, at the store level there is still a fair amount of the old communal sociability. Recognizing that workers steeped in that culture make poor candidates for assistant managers, who are the front lines in enforcing labor discipline, Wal-Mart insists that almost all workers promoted to the managerial ranks move to a new store, often hundreds of miles away. (44) ______.

(45) ______. Not unexpectedly, some managers think women with family responsibilities would balk at such demands.

For a time it seemed as if the class-action lawsuit might be a partial substitute for the role of union. By drastically limiting how a class-action suit can be brought, the Supreme Court leaves millions of service-sector workers with few avenues to escape the grinding work life and limited opportunities that so many now face.

[A] But Wal-Mart makes it impossible for many of them to take that post, because its ruthless management style structures the job itself as one that most women, and especially those with young children or a relative to care for, would find difficult to accept.

[B] The obstacles to women’s advancement do not stop there. The workweek for salaried managers is around 50 hours or more, which can surge to 80 or 90 hours a week during holiday seasons.

[C] Indeed. the sex discrimination at Wal-Mart that drove the recent suit is the product not merely of managerial bias and prejudice, but also of a corporate culture and business model that sustains it, rooted in the company’s very beginnings.

[D] Especially in recent years, Wal-Mart’s same-store sales have declined. Workers of both sexes pay the price, but women, who constitute more than 70 percent of hourly employees, pay more.

[E] A patriarchal (男性统治或者主宰的) ethos was written into the Wal-Mart DNA. And that corporate culture was "the single most important element in the continued, remarkable success of Wal-Mart," asserted Don Soderquist, the company’s chief operating officer in the 1990s.

[F] There used to be a remedy for this sort of managerial authoritarianism: it was called a union, which bargained over not only wages and pensions but also the kind of qualitative issues, including promotion and transfer policies.

[G] For middle-aged women caring for families, this corporate reassignment policy amounts to sex discrimination. True, Wal-Mart is hardly alone in demanding that rising managers sacrifice family life, but few companies make relocation such a fixed policy.

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