问题 选择题

Ⅰ、甲同学欲配制0.55 mo1·L—1 的NaOH溶液200mL(存在200mL容量瓶)。称量操作如下:

①先用托盘天平称量烧杯的质量。称量前先调节天平零点。用“↓”表示在天平右盘上放置砝码,用“↑”表示从天平右盘上取下砝码。取用砝码情况和游码读数如下:

砝码质量502020105
取用砝码情况先↓后↑先↓后↑先↓后↑
 

烧杯的质量为              g。

②称量烧杯和NaOH固体的质量。再在天平右盘上放置          g砝码,将游码的位置移到        g的位置,往烧杯中逐渐加入NaOH固体,直到天平达到平衡。

Ⅱ、乙同学欲用用18mol/L 浓硫酸配制100 ml 3.0mol/L 稀硫酸的实验步骤如下:

① 计算所用浓硫酸的体积  ② 量取一定体积的浓硫酸 ③ 溶解  ④ 转移 

⑤洗涤 ⑥定容  ⑦摇匀

回答下列问题

(1)所需浓硫酸的体积是         ,量取浓硫酸所用的量筒的规格是    (请填编号)(从下列中选用  A.10ml   B.25ml   C.50ml   D.100ml)

(2)定容时俯视溶液的凹液面对所配制的稀硫酸浓度有何影响               

(用偏大、偏小、无影响填写)

答案

Ⅰ、①33.2g ②5  2.6       Ⅱ、⑴16.7ml  B  ⑵偏大

题目分析:称量里,左边放物体,右边放砝码,物体的质量等于砝码加游码的质量。溶液的稀释遵循稀释定律。即:c(浓硫酸)×V(浓硫酸)= c(稀硫酸)×V(稀硫酸)

选择题
阅读理解

阅读理解。

     Inventor,physicist,surveyor,astronomer,biologist,artist... Robert Hooke was all these

and more.Some say he was the greatest experimental scientist of the seventeenth century.

Once he worked with renowned men of science like Christian Huygens,Antony van

Leeuwenhoek,Robert Boyle,Isaac Newton and the great architect,Christopher Wren.

     Hooke's early education began at home,under the guidance of his father.He entered

Westminster School at the age of thirteen,and from there he went to Oxford,where he

came in contact with some of the best scientists in England.Hooke impressed them with

his skill at designing experiments and devising instruments.In 1662,at the age of

twenty-eight,he was named Curator of Experiments of the newly formed Royal Society

of London.Hooke accepted the job,even though he knew that it had no money to pay him!

     Watching living things through the microscope was one of his favorite occupations.He

devised a compound microscope for this purpose.One day while observing a cork (软木)

under a microscope,he saw honeycomb-like structures.They were cells-the smallest units

of life.In fact,it was Hooke who coined the term "cell" as the boxlike cells of the cork

reminded him of the cells of a monastery(修道院).

     Perhaps because of his varied interests,Hooke often left experiments unfinished.Others

took up where he left off and then claimed sole(独占的)credit.This sometimes led to

quarrels with colleagues.One work that he finished was his book MICROGRAPHIA,a

volume that reveals the immense potential of the microscope.The book also includes,

among other things,ideas on gravity and light which may have helped scientists like

Newton while they were developing their own theories on these phenomena.

     Hooke made valuable contributions to astronomy too.A crater(陨石坑) on the moon

is named after him in appreciation of his services to this branch of science.

1.From the first paragraph,we can know that Robert Hooke __________.

A.was famous because he worked with many scientists

B.liked making friends with the famous people

C.received a lot from other scientists

D.made contributions to many different fields

2.Robert Hooke probably went to school in __________.

A.1647B.1634

C.1662D.1640

3.Robert Hooke made himself known to some of the best scientists in England by __________.

A.learning by himself with his father's help

B.introducing himself to them

C.designing experiments and instruments

D.refusing any reward from Royal Society of London

4.Robert Hooke couldn't get along well with his colleagues because __________.

A.he couldn't finish his work on time sometimes

B.he had all kinds of interests in his daily life

C.he was too proud to look up to them

D.the other scientists took the fruits of his experiments

5.Which of the following about the book MICROGRAPHIA is TRUE?

A.It has been used in many fields.

B.Its ideas on gravity and light might have been helpful for Newton.

C.Newton realized the importance of it.

D.Hooke thought highly of Newton's scientific theory in it.