初中化学经典计算题The classical calculation problems of junior high school chemistry.docx
- 文档编号:1243901
- 上传时间:2022-10-19
- 格式:DOCX
- 页数:15
- 大小:23.96KB
初中化学经典计算题The classical calculation problems of junior high school chemistry.docx
《初中化学经典计算题The classical calculation problems of junior high school chemistry.docx》由会员分享,可在线阅读,更多相关《初中化学经典计算题The classical calculation problems of junior high school chemistry.docx(15页珍藏版)》请在冰豆网上搜索。
初中化学经典计算题Theclassicalcalculationproblemsofjuniorhighschoolchemistry
初中化学经典计算题(Theclassicalcalculationproblemsofjuniorhighschoolchemistry)
1.iodizedsaltisaddingacertainamountofpotassiumiodate(KIO3'srelativemolecularmassis214)inthesalt,andedibleiodizedsaltcaneffectivelypreventiodizedsaltdeficiency.(theresultsretainadecimalnumber)
(1)20mg_________mginpotassiumiodateiodine
(2)adayforadultsisabout0.15mg,assumingthatthesearemainlyfromiodizedsaltintakeofiodizedsalt,iodineiniodizedsaltif20mg1000gisrequired,adultdailyconsumptionofiodizedsalt____________.g
2.existingimpuritiesinSolidBariumChloridesamples(waterinsolubleimpurities),take12.5gsamplesintothebeaker,thenadd39.6gofwatertomakeitfullydissolved,staticfilteredimpurities,10gfiltrate,silvernitratesolutionaddenough,aftercompletereactiontoprecipitate2.87g.(thecalculationisaccurateto0.1%)
(1)themassfractionofsoluteinfiltrate;
(2)themassfractionofbariumchlorideinthesample.
3inJilinProvince,someextra-curricularinterestgroupsonanumberofsamples(ironcontainingimpuritiesimpurities,insolubleinwater,noreactionwithdilutesulfuricacid)wereanalyzed,a,BandCthreestudentstestwerecarriedoutincludingdilutesulfuricacidandironsamplesonlyonestudentforexactlythereactiontheexperimentaldataarelistedinthefollowingtable:
ABC
Beaker+dilutesulphuricacid200g,150g,150g
Theaddedironsample9g,9g,14g
Afterfullreaction,beaker+residue208.7g,158.7g,163.7g
Pleaseanalyzethedatacarefullyandanswerthefollowingquestions:
(1)thedilutesulfuricacidwhichtheclassmatetookisjustacompletereactiontotheironsample;
(2)calculatethemassfractionofironinthesample;
(3)calculateexactlythemassfractionofsoluteinthesolutionobtainedaftercompletereaction.(thequalityofthebeakeris25.4g;thecalculationisaccurateto1%)
4.Burn4Gsulfurpowderinagivenmassofoxygen.Theexperimentaldataareshowninthefollowingtable.Pleaseanswerthefollowingquestions:
Thefirsttimeortwoorthreetimes
O2mass(g)346
SO2mass(g)6
(1)inthefirstexperiment,qualityandgenerationinresponsetothequalityoftheSandO2SO2ratiois:
_________.
(2)pleasecalculatehowmuchsulfurdioxideisproducedbythesecondexperiment
(3)filloutthethirdexperimentintheformtoproducethequalityofsulfurdioxide.
Heilongjiangprovince5,10gimpuremagnesiumchloridesamples(impuritiesinsolubleinwater),
50gthewaterisfullystirred,andthemagnesiumchlorideinthesampleisdissolvedandfiltered(filtratelossisnotnegligible),andthefiltrateisreactedwith63.3gsodiumhydroxidesolutiontoproduce5.8Gwhiteprecipitate.
Beg:
(...)QualityofMagnesiumOxideinsample.
(2)themassfractionofsoluteinthesolutionobtainedbythereaction.
6,"osteoporosis"iscausedbythebody'scalciumdeficiency,canbetakencalciumsupplementstotreat.Calciumlactate(CaC6H10O6?
5H2O)isacommoncalciumsupplement,thesaleofCalciumLaclateTabletstabletscontainingcalciumlactate200mg.anadultcalciumdeficiencypatientstake20tabletsdailyCalciumLaclateTabletsagentcanachievetheobjectiveofcalcium.Calculation:
(calculationresultsretaininteger)
(1)themassratioofeachelementincalciumlactate.
(2)theadultpatientswithcalciumdeficiencyshouldswitchtomilk(calcium0.104gineach100mgmilk)tosupplementcalcium.Howmanymlofmilkshouldbeconsumedatleasteveryday?
.
JiangsuProvince,7ironandsteelalloyofiron,carboncontentinpigironin2.0%~4.3%,steelcarboncontentin0.03%~2%.Amassofironalloy10.0gintoaconicalflasktotheconicalflaskadd100gofdiluteH2SO4,justtomaketheironalloyironreaction(carboninsolubleindilutesulfuricacid;otherelementsinironalloyisverylowandnegligible),measuredtogenerateH2volume4.00L(H2densityintheconditionof0.0880g/L).Accordingtothecalculation,answer:
(calculatetheresulttoretainthreedigits.)
(...)Istheironalloypigironorsteel?
(2)thesolutemassfractionofthesolutionobtainedafterthereaction.
NingboCity,8to3.1gramsofsodiumoxideisaddedtothequalityofmwater,aftercompletereaction,getthesolutemassfractionis16%ofthesolution,adding50gramsofhydrochloricacidinthesolution,bothexactlythereaction.(sodiumandwaterreactionchemicalequation:
Na2O+H2O==2NaOH).O:
(1)thevalueofM
(2)themassfractionofsoluteinhydrochloricacidadded.
(3)ifthesodiumhydroxidesolutionafterthereactionbecomes20?
Csaturatedsolution,atleasttoevaporatehowmanygramsofwater?
(20?
C,thesodiumsolubilityis36grams)
Anhuiprovince9,thefollowingistheprovinceofsomeofthecalciumplussaltpackaginglabelsonthe
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- 初中化学经典计算题The classical calculation problems of junior high school chemistry 初中化学 经典 算题 The
链接地址:https://www.bdocx.com/doc/1243901.html