问题 填空题

(10分)工业上常用天然气作为制备的原料。已知:

 

 

 

(1)反应生成的热化学方程式为       

(2)向VL恒容密闭容器中充入,在不同压强下合成甲醇。的平衡转化率与温度、压强的关系如下图所示:

①压强         (填“<”、“>”或“=”)

②在压强时,平衡常数为     (用含的代数式表示)。

(3)下图是甲醇燃料电池(电解质溶液为稀硫酸)结构示意图,电极通入的     ,电极反应式是       

若用该电池电解溶液,当得到铜时,参加反应的气体的体积应为     (标准状况)。

答案

(1) 2分

(2)①  <                                                                                           1分

                                                                                         2分

(3)甲醇(或)                                                                       1分

                                            2分

0.56L                                                                                                2分

(1)考查盖斯定律的应用。根据已知可知,①+②+③×2即得到

,所以反应热是-321.5kJ/mol+250.3 kJ/mol-90 kJ/mol×2=-251.2 kJ/mol。

(2)①反应③是体积减小的可逆反应,所以压强越大,转化率越高,因此

②根据图像可知,平衡时CO的转化率是50%,所以平衡时生成甲醇0.5amol,剩余CO和氢气分别是0.5amol和amol,因此平衡常数为

(3)根据装置图中电子的流向可知,左侧是原电池的负极,失去电子,所以左侧通入的是甲醇。应用电解质是稀硫酸,且只能允许质子通过,所以负极反应式为

单项选择题

The willingness of doctors at several major medical centers to apologize .to patients for harmful errors is a promising step toward improving the rather disappointing quality of a medical system that kills tens of thousands of innocent patients a year inadvertently.

For years, experts have lamented that medical malpractice litigation is an inefficient way to deter lethal or damaging medical errors. What they noticed, simply put it, is that most victims of malpractice never sue, and there is some evidence that many patients who do sue were not harmed by a physician’s error but instead suffered an adverse medical outcome that could not have been prevented. The details of what went wrong are often kept secret as part of a settlement agreement.

What is needed, many specialists agree, is a system that quickly brings an error to light so that further errors can be headed off and that compensates victims promptly and fairly. Many doctors, unfortunately, have been afraid that admitting and describing their errors would only invite a costly lawsuit.

Now, as described by Kevin Sack in The Times, a handful of prominent academic medical centers have adopted a new policy of promptly disclosing errors, offering earnest apologies and providing fair compensation. It appears to satisfy many patients, reduce legal costs and the litigation burden and, in some instances, helps reduce malpractice premiums. Here are some examples from colleges of the United States: at the University of Illinois, of 37 cases where the hospital acknowledged a preventable error and apologized, only one patient filed suit; at the University of Michigan Health System, existing claims and lawsuits dropped from 262 in August 2001 to 83 in August 2007, and legal costs fell by two-thirds.

To encourage greater candor, more than 30 states have enacted laws making apologies for medical errors inadmissible in court. That sounds like a sensible step that should be adopted by other states or become federal law. Such laws could help bring more errors to light. Patients who have been harmed by negligent doctors can still sue for malpractice, using other evidence to make their case.

Admitting errors is only the first step toward reforming the health care system so that far fewer mistakes are made. But reforms can be more effective if doctors are candid about how they went astray. Patients seem far less angry when they receive an. honest explanation, an apology and prompt, fair compensation for the harm they have suffered.

While many specialties call for a disclosure mechanism, some physicians are worrying about()

A. exposure to the media

B. describing their mistakes in details

C. compensating victims promptly and fairly

D. involvement in an expensive civil case

问答题 简答题