问题 问答题

下面所示为实验室中二氧化碳制备、干燥和收集的部分仪器.试根据题目要求,回答下列问题:

(1)写出图中所标示的实验仪器名称:

①______;②______;③______.

(2)用碳酸钙和稀盐酸为原料在实验室中制备并收集干燥的二氧化碳.

①所选仪器的连接顺序为______(填写仪器字母).证明二氧化碳已经收集满的方法是将______放在______,如果看到______则证明集气瓶内已经充满二氧化碳.

②写出碳酸钙和稀盐酸为原料制取二氧化碳的化学方程式:______.

③A装置中盛有浓硫酸的洗气瓶的作用是______.

(3)氢气气体难溶于水,密度小于空气,实验室收集氢气的方法有______和______(填写仪器序号).

答案

(1)仪器①是分液漏斗;仪器②是锥形瓶,仪器③是集气瓶.

(2)①A装置是用来制取二氧化碳的装置,由于浓硫酸具有吸水性,可以用来干燥气体,再进行收集,由于要收集干燥的二氧化碳,根据密度比空气大,用向上排空气法收集,所以仪器的连接顺序为A→B.

检验二氧化碳已经收集满的方法是将燃着的木条放在集气瓶口,如果看到木条熄灭,则证明集气瓶内已经充满二氧化碳.

②碳酸钙与稀盐酸反应生成氯化钙、水和二氧化碳,反应的化学方程式为:CaCO3+2HCl═CaCl2+H2O+CO2↑.

③浓硫酸具有吸水性,A装置中盛有浓硫酸的洗气瓶的作用干燥二氧化碳气体.

(3)氢气的密度比空气小,可以采用向下排空气法收集;氢气难溶于水,也可以采用排水法收集.

故答案为:(1)①分液漏斗,②锥形瓶,③集气瓶;(2)①A→B;燃着的木条;集气瓶口;木条熄灭;②CaCO3+2HCl=H2O+CaCl2+CO2↑;③干燥;(3)C;D.

阅读理解

Boston College is a state-supported college on the East coast of England which has been recruiting overseas students for over 20 years and now has almost 200 international students from more than 20 different countries. You and your parents can be sure you will receive the care and support you need to succeed at our college.

We have excellent teaching staff, with time and patience to help you learn in a stimulating but relaxed atmosphere. We are accredited by the British Council for the quality of our English Language teaching so you can be sure your learning experience will be good.

Our new modular English course is flexible and enables you to choose the best time to join us. Not only will you cover all aspects of the English Language but you will have the choice of option subjects such as IELTS Preparation, British Culture, Literature, Business English or Study Skills. We will assess your level of English when you arrive so you can be sure you will study with students of the same ability. Classes are small: usually 12-16 students so you will receive the individual attention you need to help you succeed.

Boston College is based on two main campuses with English courses being taught in our state-of-the-art language building convenient for our Hall of Residence on the Rochford Campus. A-Level and International Foundation classes are taught on both Rochford and De Montfort Campuses. Classrooms are modern and well equipped with a number of specialist facilities for photography and video, computer suites, art and music studios and an all weather sports pitch. Both campuses have large Learning Resource Centres, well equipped with computers for student use, also available for research or assignment work. Our diploma courses include catering, hairdressing, computing and engineering, each with its own specialist facilities. We also have a Music Centre providing teaching rooms, recording studio and concert hall.

65. What is Boston College famous for?

A. Its long educational history in Britain.

B. Its good location in the country.

C. Its good education conditions for overseas students.

D. Its way of living for the overseas visitors.

66. The underlined word “accredited” in Paragraph 2 most probably means __________.

A. helped              B. recognized         C. forbidden    D. measured

67. If you decide to go to Boston College in Britain, you __________.

A. should at first pass some English language tests

B. can major in English as well as some other courses

C. have to live and study with students at different levels

D. should have achieved a high level of English proficiency

68. What is the purpose of the above passage?

A. To introduce the British education system.

B. To invite more overseas students to study in Boston College.

C. To show the modernization of British society.

D. To tell new students the rules in Boston College.

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