问题 填空题

(6分)今年我县各学区都进行了部分学生化学实验操作竞赛,某学区竞赛题目之一是“配制70g20%的氯化钠溶液”。该实验的部分操作如下图所示。

(1)需要称取氯化钠的质量是                g,称量时A出现了右盘低的现象,接下来的操作应该是                                       

①左边的平衡螺丝向左调        ②右边的平衡螺丝向右调

③右盘中减少砝码              ④左盘中增加食盐

(2)B中仪器a的名称是                    。量取水时,如果按照图B的方法读数,会使配制的溶液溶质质量分数                  (填“偏大”或“偏小)。

(3)C中用玻璃棒搅拌的作用是                                        

(4)D中所贴标签有不妥之处,请划掉不妥的地方,并在方框中写出你认为适合的内容。

答案

(1)14g   ④

(2)量筒 偏小

(3)加速食盐溶解

(4)

分析:(1)根据溶质计算方法和称量时的注意事项考虑;(2)根据仰视读数量取水的多少考虑本题;(3)根据玻璃棒的用途考虑;(4)根据标签的写法考虑.

解:(1)氯化钠质量:70g×20%=14g;在称量中天平发生偏转时要么加药品,要么减药品,出现了右盘低的现象说明药品少了,应该增加食盐;故选④;

(2)熟记常见仪器的名称,仰视读数量取水时看到的读数偏小,但量取到的液体正好偏多,水多了,溶质质量分数就偏小;

(3)玻璃棒搅拌目的是加速氯化钠溶解;

(4)标签上应该注明的是溶液的溶质质量分数.

故答案为:(1)14g  ④

(2)量筒 偏小

(3)加速食盐溶解]

(4)20%

点评:通过回答本题知道了溶质、溶剂质量的计算方法,用天平称量时的注意事项,掌握了玻璃棒的作用和量筒的使用方法

完形填空

阅读下面短文并回答问题,然后将答案写到答题卡相应的位置上(请注意问题后的词数要求)。

【1】The air was pleasant and the music was loud in the vast square in front of the New York State office building in Harlem(哈莱姆,美国纽约市黑人居住区) as health advocates(支持者,提倡者) set up information tables for Harlem wellness Week. It was a wide-ranging effort to educate people about non-communicable diseases: Heart disease, cancer, lung disease, obesity, and so on.

【2】There is an economic effect caused by these diseases, especially in Harlem, one of the city’s poorest districts. Without healthy employees and healthy customers, you cannot have healthy business, says Patricia Ricketts of the Greater Harlem Chamber of Commerce, which sponsors Wellness Week.

【3】Dr. Jo Ivy Boufford is president of the New York Academy of Medicine, a Wellness Week partner. She says education about better nutrition is important, but that people with low incomes often lack the means to put what they know into practice. But there is hope. New York is very active in advocating good, effective public health policies. “New York City has banned smoking in public places, both indoors and outdoors. That is a fantastic example of what can be done, without having any impact on the economy. It is a city where you have bike paths. That is a good message for the world, because bikes make your transport active. That is good for your health and lowers air pollution,” she said.

【4】“It is not enough to focus on the management of disease through medication,” Dr. Boufford says. “That’s why health advocates will be trying to persuade UN officials during Wellness Week to pass resolutions that deal with road and transport design and construction and other potential causes of non-communicable diseases.”

小题1:What is the main idea of the text? (no more than 8 words)

                                                                           

小题2:Complete the following statement with words from Paragraph【4】.(no more than 3 words)

________________________the management of disease through medication is not enough.

小题3:What non-communicable diseases are mentioned in the text?( no more than 6 words)

                                                                           

小题4:Do you think it is necessary to hold a Wellness Week to prevent diseases? Why, or why not? (no more than 16 words)

                                                                           

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小题5:What does the word “That”(paragraph 3) refer to? (no more than 4 words)

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单项选择题