(8)除去A中的泥沙用过滤法;分离A与B(含量少)的混合物,用结晶法
2、气体的溶解度
(1)气体溶解度的定义:
在压强为101kPa和一定温度时,气体溶解在1体积水里达到饱和状态时的气体体积。
(2)影响因素:
①气体的性质②温度(温度越高,气体溶解度越小)
③压强(压强越大,气体溶解度越大)
3、混合物的分离
(1)过滤法:
分离可溶物+难溶物
(2)结晶法:
分离几种可溶性物质
结晶的两种方法蒸发溶剂,如NaCl(海水晒盐)
降低温度(冷却热的饱和溶液,如KNO3)
IV、溶质的质量分数
1、公式:
溶质质量分数=×100%
2、在饱和溶液中:
溶质质量分数C%=×100%(C
3、配制一定溶质质量分数的溶液
(1)用固体配制:
①步骤:
计算、称量、溶解
②仪器:
天平、药匙、量筒、滴管、烧杯、玻璃棒
(2)用浓溶液稀释(稀释前后,溶质的质量不变)
①步骤:
计算、量取、稀释
②仪器:
量筒、滴管、烧杯、玻璃棒
IVTrouble测试
Choosethewordsorexpressionsandcompletethepassage:
AllaboutBritain’sTeenagers
School
BritishteenagerscanleaveschoolatsixteenaftertakingtheirGCSEexams.Theystudyforexamsinasmanyastensubjects,90theyhavetoworkprettyhard!
Today’steensspendmoretimedoingtheirhomeworkthananyteenagersinthepast,studyingfor2.5–3hourseveryevening.
FreeTime
It’snotallwork,ofcourse.WhatdoBritishteenagersdotohave91?
TheylovewatchingTV,goingout,meetingfriendsinInternetcafésandlisteningtomusic.
Communications
InadditiontotheInternet,teenagersinBritainusetheircomputerstoplaygamesanddotheirhomework.They92lovetheirmobilephones,andspendhourstexting(发短信)theirfriendsandchatting.Today,phonesaregettingsmallerandlighterandyoucandoalotmore
93themthanjusttalk.Textmessaginghasbecomethecoolestandmostpopularwaytocommunicate.Morethan90%of12-to16-year-oldshaveamobile,andexpertssaythatthisstops94fromspendingtheirmoneyonsweetsandcigarettes.
Fashion(服饰)
Atschool,almostallBritishteenagershavetowearaschooluniform.However,intheirfree
95theycanwearwhatevertheylike,andwhattheylikeisdesignernamessuchasNike,DieselandPaulSmith.Infact,40%ofBritishteenssaythattheythinkitisimportanttohavethelatestfashion.Lookinggooddoesn’tcome96,butmanyteenagersthinkitusualoreasytospendmorethan£100ononeitemofclothing.
90.A)butB)orC)soD)because
91.A)lessonsB)sportsC)adviceD)fun
92.A)neverB)alreadyC)alsoD)nolonger
93.A)withB)forC)atD)in
94.A)teachersB)relativesC)friendsD)teenagers
95.A)dayB)timeC)weekD)month
96.A)cheapB)expensiveC)specialD)ordinary
Module1Unit3Dealingwithtrouble
核心词汇
argue(v)争吵,争论empty(a.)空的
crowd(n)人群stare(n)&(v)瞪视,盯着看
notice(v)注意到follow(v)跟从,跟随
action(n)行为,举动report(v)&(n)报道,报告
dial(v)拨号rob(v)抢劫
detail(n)细节steal(v)偷(steal---stole—stolen)
教学难点:
1.不规则动词的拼写,一般过去时的助动词did的运用.表示过去的时间短语last,ago
2.独立完成自己的日记。
课前导学:
?
单词和短语:
1.____________穿过,贯穿prep.
2.____________偷,偷窃,盗窃罪n.
3.____________担心的,发愁的adj.
4.____________________怎样解决,处理,应付
5.____________________遭到,遇到
6.____________________给更多的细节
7.____________________两位女游客
8.____________________递出东西,伸出手
9.____________________一件不同寻常的事情
10.____________________发生什么事了?
11.____________________抢某人东西
12.____________________拨(电话号码)v.
13.____________________报告一起盗窃案
14.____________________下车/船、飞机
15.____________________盯着看;凝视
16.____________________在。
。
。
中穿过
17.____________________害怕。
。
。
18.____________________匆匆上了船
19.____________________从。
。
旁边走过
20.____________________挂断电话
?
同义词互换:
1.argue=__________
2.following=___________
3.happen(发生)=__________
?
补充词汇、短语、句型、知识点:
1.Dealingwithtrouble处理麻烦.
本例中的dealwith意为“解决,处理,应付”。
又如:
Howwouldyoudealwiththiscase?
你讲如何处理这个案件?
2.Pauliswritingaboutanunusualthingthathappenedtohimoneday.保罗正在写某天发生在他身上的一件不同寻常的事情。
(1)happento是“遭到,遇到”的意思。
强调某人发生某种情况,尤指不幸的事。
如:
Ihopenothinghashappenedtomyfriend.
(2)oneday是指“(将来或过去的)”某一天。
如:
Iamsurehewillsucceedonedayoranother.
Hedreamedofbecomingafamousscientistoneday.
3.Twowomentouristsandayoungmanwereshoutingateachother.两位女游客和意为男青年正在争吵。
(1)womentourists是womantourist的复数形式。
我们可以用man或woman修饰另一个名词来说明该名词的性别,此时若要变成复数形式,须将man或woman与被修饰的名词一同变成复数形式。
又如:
TherewereonlymendriversinShanghaimanyyearsago.
(2)shoutat意为“冲….嚷嚷,冲……喊叫”;shoutbackat是“冲….回嚷”的意思。
又如:
Themotherisshoutingathersonandthenaughtyboyisshoutingbackather.
4.Themanheldoutabag,andshowedeveryonethatitwasempty.男青年双手递出一直包,向周围的人展示它是空的。
(1)holdout是“递出东西,伸出手”的意思。
如:
Jillheldoutherglasstoberefilled
(2)拓展:
动词hold的主要用法:
1)握,持,抱,搂
Sheheldababyinherarm.
2)保持
Holdyourhandup.
3)装,容纳
Thecarcanholdfivepeople.
4)使发生,举行
Themeetingwasheldinthetownhall.
5)持有
HeholdsaSwisspassport.
5.Dadjustsmiled.爸爸只是笑了笑。
(1)just是副词,意为“只是,仅仅是”,如:
Heisjustachild.
(2)拓展:
副词just的主要用法:
1)多用于完成时态中,置于动词与助动词之间,意为“刚刚,刚才”,如:
Ihavejustfinishedmyhomework.
2)恰恰,正好(不用于否定句中,相当于exactly),如:
It’sjusthalfpastsix.
3)相当于only,意为“仅仅,只是”,如:
Iwasjustfiveyearsoldthen.
4)用于祈使句中,以引起别人对某事的注意,有时也可以使语气婉转一些,意为“就,请”,如:
Justlistentome.
5)与just相关的短语
justnow用于过去时,意为“刚才”,即amomentago.
justas正如,恰似
justthen就在那时
justthesame照样
?
词性互换
1.argue(n.)–________(n.)
2.rob(v.)–__________(n.)
3.following(a.)–__________(v.)
4.usual(a.)–__________(反a.)
5.hurry(v./n.)–__________(a.)
6.report(v./n.)–__________(n.)
exercise:
1.Thebabiesaresleeping.Pleaseleavetheroom__________.(quiet)
2.The___________werearrestedatlast.(rob)
3.Tomwenttoschoolina_______inordernarottobelateagain.(hurried)
4.Mrs.Smithhadan______withherneighbouryesterday.(argue)
?
阅读练习
(A)
Youngpeopleareoftenunhappywhentheyarewiththeirparents.Theysaythattheirparentsdon’tunderstandthem.Theyoftenthinktheirparentsaretoostrictwiththem,andtheyarenevergivenafreehand.Parentsoftenfinditdifficulttowintheirchildren’strustandtheyseemtoforgethowtheythemselvesfeltwhentheywereyoung.Forexample,youngpeopleliketodothingswithoutmuchthinking.It’soneoftheirwaystoshowthattheyhavegrownupandtheycandealwithanythingdifficult.Olderpeoplemoreeasilygetworried.Mostofthemplanthingsaheadoftimeanddon’tliketheirplanstobechanged.
Whenyouwantyourparentstoletyoudosomething,youwillhavebettersuccessifyouaskbeforeyoureallystartdoingit.
Youngpeopleoftenmaketheirparentsangryabouttheclothestheywear,themusictheyenjoyandsomethingelse.Buttheydon’tmeantocauseanytrouble.Theyjustfeelthatinthiswaytheycanbecutofffromtheoldpeople’sworldandtheywanttomakeanewcultureoftheirown.Andiftheirparentsdon’tliketheirmusicorclothesortheirmannerofspeech,theyoungpeoplefeelveryunhappy.
Sometimesyouevendon’twantyourparentstosay,“Yes”towhatyoudo.Youjustwanttostayathomealoneanddowhatyoulike.
Ifyouplantocontrolyourlife,you’dbetterwinyourparentsoverandtrytogetthemtounderstandyou.Ifyourparentsseethatyouhaveahighsenseofresponsibility,theywillcertainlygiveyoutherighttodowhatyouwanttodo.
Choosethebestanswer:
6%
()1.Youngpeopleoftenfeelunhappywhen__________.
A.theirparentsdon’ttrustthemB.theirparentsforgetthem
C.theydon’tlivewiththeirparentsD.theystaywiththeirparents
()2.Youngpeoplethinktheirparents__________.
A.wintheirchildren’strustB.don’tunderstandthem
C.givethemafreehandD.dothingswithoutmuchthinking
()3.Youngpeople__________.
A.liketodothingsaftermuchthinkingB.candolotsofdifficultthings
C.maketheirparentsangrywithwhattheydoD.wanttheirparentshelpthemmoreoften
()4.Oldpeople__________.
A.LiketoplanthingsaheadoftimeB.maketheirchildrenangry
C.oftenchangetheirplansD.neverworryaboutanything
()5.Fromthepassageyouknowthat__________.
A.youngpeoplewanttocausesometrouble
B.youngpeoplewanttomakeanewcultureoftheirparents
C.parentsliketolettheirchildrendowhattheylike
D.sometimesparentsdon’tliketheirchildren’smannerofspeech
()6.Young