问题 选择题

印制电路板时常用氯化铁溶液作为“腐蚀液”,发生的反应为:2FeCl3+Cu=2FeCl2+CuCl2,向盛有氯化铁溶液的烧杯中同时加入铁粉和铜粉,反应结束后,下列结果不可能出现的是    (   )

A.烧杯中有铜无铁

B.烧杯中有铁无铜

C.烧杯中铁、铜都有

D.烧杯中铁、铜都无

答案

答案:B

题目分析:向盛有氯化铁溶液的烧杯中同时加入铁粉和铜粉,不仅发生:2FeCl3+Cu=2FeCl2+CuCl2,还会发生:Fe + CuCl2=" Cu" + FeCl2,A、烧杯中有铜无铁,若铁的量不够,恰好完全反应,这种情况是可能存在的,B、烧杯中有铁无铜,若有铁剩余,那么发生这个反应:Fe + CuCl2=" Cu" + FeCl2,一定生成铜,错误,C.烧杯中铁、铜都有,铁、铜的量均过量,也即氯化铁溶液不够,正确,D、烧杯中铁、铜都无,即在氯化铁溶液过量的时候,正确,故选B

单项选择题

Almost every day the media discovers an African American community fighting some form of environmental threat from land fills, garbage dumps, petrochemical plants, refineries, bus depots, and the list goes on. For years, residents watched helplessly as their communities became dumping grounds.
But citizens didn’t remain silent for long. Local activists have been organizing under the mantie of environmental justice since as far back as 1968. More than three decades ago, the concept of environmental justice had not registered on the radar screens of many environmental or civil rights groups. But environmental justice fits squarely under the civil rights umbrella. It should not be forgotten that Dr. Martin Luther King Jr. went to Memphis on an environmental and economic justice mission in 1968, seeking support for striking garbage workers who were underpaid and whose basic duties exposed them to environmentally hazardous conditions.
In 1979, a landmark environmental discrimination lawsuit filed in Houston, followed by similar litigation efforts in the 1980s, rallied activists to stand up to corporations and demand government intervention.
In 1991, a new breed of environmental activists gathered in Washington, D.C. , to bring national attention to pollution problems threatening low-income and minority communities. Leaders introduced the concept of environmental justice, protesting that Black, poor and working-class communities often received less environmental protection than White or more affluent communities. The first National People of Color Environmental Leadership Summit effectively broadened what "the environment" was understood to mean. It expanded the definition to include where we live, work, play, worship and go to school, as well as the physical and natural world. In the process, the environmental justice movement changed the way environmentalism is practiced in the United States and, ultimately, worldwide.
Because many issues identified at the inaugural summit remain unaddressed, the second National People of Color Environmental Leadership Summit was convened in Washington, D.C. , this past October. The second summit was planned for 500 delegates ; but more than 1,400 people attended the four-day gathering.
"We are pleased that the Summit Ⅱ was able to attract a record number of grassroots activists, academicians, students, researchers, planners, policy analysts and government officials. We proved to the world that our movement is alive and well, and growing," says Beverly Wright, chair of the summit. The meeting produced two dozen policy papers that show powerful environmental and health disparities between people of color and Whites.

More than three decades ago, environmental justice was ______.

A.controversial among local activities

B.first proposed by Martin Luther King Jr.

C.fascinating to the civil rights groups

D.barely realized by many environmentalists

单项选择题