问题 选择题

设NA为阿伏加德罗常数的数值,下列说法正确的是

A.25℃时,pH=13的NaOH溶液中含有OH-的数目为0.1NA

B.常温常压下, 14 g由N2与CO组成的混合气体含有的原子数目为NA

C.0.1L l mol·L-1Na2CO3溶液中,阴离子总数小于0.1NA

D.50ml、l8.4 mol/L浓硫酸与足量铜微热反应,生成SO2分子的数目为0.46NA

答案

答案:B

题目分析:A、不知道NaOH溶液体积,无法求算OH‾的数目,错误;B、N2和CO的摩尔质量都是28g/mol,所以14 g由N2与CO组成的混合气体含有的原子数目为:14g÷28g/mol×2 NAmol-1=NA,正确;C、CO32‾发生水解反应:CO32‾+H2O=HCO3‾+OH‾,使阴离子数目增多,所以0.1L l mol·L-1Na2CO3溶液中,阴离子总数大于0.1NA,错误;D、随着反应的进行,硫酸的浓度逐渐减小,变为稀硫酸后与铜反应停止,所以生成SO2分子的数目小于0.46NA,错误。

阅读理解

阅读理解

     BEIJING-Pharmacologist Tu Youyou has become the first scientist on the mainland to win America's

respected Lasker Award for her discovery of a new approach to malaria (疟疾) treatment.

     The 81yearold was presented with the medical prize by the Albert and Mary Lasker Foundation on

September 23, 2011 in New York.

    Tu, a scientist at the China Academy of Chinese Medical Sciences in Beijing, was praised by the jury (评判委员会) for her "drug therapy (治疗) for malaria that has saved millions of lives across the globe,

especially in the developing world," according to a statement on the foundation's website.

    In early 1969, Tu was appointed head of a government project that aimed to eradicate(消灭) malaria,

and it was then that she began applying modern techniques with Chinese traditional medicine to find drug

therapy for malaria.

    After detecting (检测) 380 extracts (提取物) made from 2,000 candidate recipes, Tu and her

colleagues obtained a pure substance called "Qinghaosu", which became known as artemisinin in 1972.

    An artemisininbased drug combination is now the standard regimen (养生法) for malaria, and the

World Health Organization lists artemisinin and related agents in its catalog of "Essential Medicines", said

a statement from the foundation.

     The Lasker Awards are given annually to people who have made major advances in the understanding, diagnosis, treatment, cure and prevention of human diseases since 1945.

     Lasker Awards are known as "America's Nobels" for their knack (熟练技术) of gaining future

recognition by the Nobel committee. In the last two decades, 28 Lasker laureates (得奖者) have gone

on to receive the Nobel Prize, and 80 since 1945.

1. Which of the following statements about Tu Youyou is FALSE?

A. She is the first scientist on the mainland to win America's respected Lasker Award.

B. She is a scientist at the China Academy of Chinese Medical Sciences in Beijing.

C. She is the first scientist in the world to win America's respected Lasker Award.

D. She began applying modern techniques with Chinese traditional medicine to find drug

    therapy for malaria in 1969.

2. Lasker Award is awarded by ________.

A. New York Foundation

B. the Albert and Mary Lasker Foundation

C. Chinese Medical Sciences

D. Albert and Mary

3. What's the influence about Tu Youyou's "drug therapy for malaria"?

A. It has surprised the people in the world.

B. It has reduced malaria.

C. It applied modern techniques with Chinese traditional medicine.

D. It has saved millions of lives across the globe, especially in the developing world.

4. What can we learn from the last paragraph?

A. Lasker laureates can not receive the Nobel Prize at the same time.

B. Lasker laureates can receive the Nobel Prize at the same time.

C. Lasker Award is the Nobel Prize.

D. Lasker Awards are known as "America's Nobels".

5. What's the main idea of the passage?

A. Tu Youyou won Lasker Award for malarial drug discovery.

B. An American won Lasker Award for malarial drug discovery.

C. Americans founded the Lasker Foundation.

D. Tu Youyou discovered artemisinin.

问答题 简答题