问题 选择题

用已知浓度的盐酸滴定未知浓度的氢氧化钠溶液时,下列实验操作会引起测量结果偏高的是(  )

①用天平称量NaOH固体,将小烧杯放在右盘,砝码放在左盘,并移动游码,使之平衡 ②配制烧碱溶液时,将称量后的NaOH固体溶于水,立即移入容量瓶,将洗涤烧杯的液体注入容量瓶后,加蒸馏水至刻度线 ③中和滴定时,锥形瓶内有少量水 ④酸式滴定管用蒸馏水洗后,未用标准液洗 ⑤读取滴定管终点读数时,仰视刻度线

A.①②③

B.②④⑤

C.③④⑤

D.①②③④⑤

答案

答案:B

①称量药品时应遵循“左物右码”原则,因游码质量总是加到右盘上,故题中操作实验少称了NaOH固体,故所配溶液浓度偏低,消耗V标减小,使测定结果偏低。②由于NaOH溶于水时会放出大量的热,若趁热在容量瓶中定容,恢复至室温时溶液体积将减小,NaOH溶液浓度将增大,滴定同体积的NaOH时,消耗V标增大,使测定结果偏高。④V标偏高,测定结果偏高。⑤V标偏高,测定结果偏高,故应选②④⑤组合,即选B项。

单项选择题

Low levels of literacy and numeracy have a damaging impact on almost every aspect of adults, according to a survey published yesterday, which offers (1) of a developing underclass. Tests and (2) with hundreds of people born in a week in 1958 graphically illustrated the (3) of educational underachievement. The effects can be seen in unemployment, family (4) , low incomes, depression and social inactivity.

Those who left school at 16 with poor basic skills had been employed for up to four years less than good readers (5) they reached 37. Professor John Bynner, of City University, who carried the research, said that today’s (6) teenagers would even encounter greater problems because the supply of (7) jobs had shrunk.

Almost one fifth of the 1,700 people interviewed for yesterday’s report had poor literacy and almost half (8) with innumeracy, a proportion (9) other surveys for the Basic Skills Agency. Some could not read a child’s book, and most found difficult (10) written instruction.

Poor readers were twice as likely to be a low wage and four times likely to live in a household where partners worked. Women in this (11) were five times as likely to be (12) depressed, (13) both tended to feel they had no control over their lives, and to trust others (14) .

Those who had low literacy and numeracy were seldom (15) in any community organization and less likely than others to (16) in a general election. There had been no (17) in the literary level of (18) reporting problems.

Alan Wells, the agency’s director, said: “ The results emphasize the dangers of developing an underclass people, who were out of work, (19) depressed and often labeled themselves as (20) . There is a circle of marginalization, with the dice against these people and their families.”

20()

A.failures

B.winners

C.successors

D.patients

判断题