首页
登录
职称英语
What is the purpose of this class discussion? [br] [originaltext]S: Let’s talk
What is the purpose of this class discussion? [br] [originaltext]S: Let’s talk
游客
2023-11-21
36
管理
问题
What is the purpose of this class discussion? [br]
S: Let’s talk about the results of your laboratory experiment. Did you have any problems with it?
B: Yes, Professor Smith. We did.
S: Who’s your lab partner, Bob?
B: Anne Wilson.
S: Well, Anne, can you and Bob go over the procedure for the class?
A: Sure. First we put ten grams of crushed limestone in a bottle.
S: Anything special about the bottle?
B: It was a gas-collecting bottle with a one-hole stopper and bent glass tubing.
S: Very good. So you put the limestone in a gas-collecting bottle. Then what?
A: Then we poured in ten milligrams of hydrochloric acid, put on the stopper, and collected a bottle of carbon dioxide.
S: Right, what was the method of collection?A: Water displacement.
S: Good.
A: Then, we lit a magnesium ribbon and put it in the bottle of carbon dioxide.
B: And carbon deposits began to form on the bottom of the bottle, you see, we didn’t have any problem with procedure...
A:WeI1, we had a little problem getting the magnesium ribbon to stay lit until we could get it into the bottle.
B: Okay. But we did it. The big problem was that we really didn’t understand what happened. Did the magnesium combine with the oxygen in the carbon dioxide?
S: You have just answered your own question, Rob. The burning magnesium broke the carbon -oxygen bonds in the carbon dioxide, and then the oxygen combined with the magnesium to produce magnesium oxide.
A: And the carbon was freed to deposit itself on the bottle.
S: Exactly.
选项
A、Magnesium.
B、Limestone.
C、Carbon.
D、Water.
答案
C
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3206146.html
相关试题推荐
TheBosniangovernmentsays_______.[originaltext]TheBosnianSerbgovernm
Accordingtothispassage,whatisexactlyGDP?[br][originaltext]Governm
Accordingtothispassage,whatisexactlyGDP?[br][originaltext]Governm
WhatdoesMarythinkissoincredibleandwonderful?[br][originaltext]M:Thin
WhatdoesMarythinkissoincredibleandwonderful?[originaltext]M:Thinkabou
Howmanycasualtiesdidtheattackcause?[originaltext]AtleastfourMuslim
Whatarethespeakers?[br][originaltext]M:Goodmorning,ProfessorPerkins,I
Whatarethespeakers?[originaltext]M:Goodmorning,ProfessorPerkins,Ihope
Whatpromptedthisconversation?[br][originaltext]M:Idon’tunderstand.Igo
Whatpromptedthisconversation?[br][originaltext]M:Idon’tunderstand.Igo
随机试题
Inthe1960s,agroupofwomenagreedtoundergothesamestricttestsasth
[originaltext]W:Hi,I’mRebeccaHall.I’mcallingfromBaumatic.M:Oh.Hi,Re
InonlytwodecadesAsianAmericanshavebecomethefastest-growingU.S.min
Hisstrongsenseofhumorwas______makeeveryoneintheroomburstoutlaughin
[originaltext]W:Hi,Mike.M:Hi.I’msurprisedtoseeyouonthecitybus.Why
The35-year-oldBeijingwomaniswatchinganadshowingagianttelevisionm
( )的任务是:根据系统说明书规定的功能要求,考虑实际条件,具体设计实现逻辑模
下列关于胎儿与母体关系表述错误的是:A.胎儿和母体的血液通过脐带相通 B.胎儿
患者,女,24岁。停经6周诊断为早孕,行人工流产术,吸宫后探宫腔发现探不到宫底,
男性,69岁,4个月前患者双下胶水肿,血红蛋白150g/L,尿常规蛋白阳性,24
最新回复
(
0
)