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硫酸铁铵[NH4Fe（SO4）2•xH2O]是一种重要铁盐．为充分利用资源，变废为宝，在实验室中探究采用废铁屑来制备硫酸铁铵，具体流程如图： 回答下列问题： （1）步骤①的目的是去除废铁屑表面...
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高三下学期化学《》真题及答案
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欲配制0.1mg/mL的铁标准溶液250mL应称取硫酸亚铁铵FeNH42SO42·6H2O多少克Fe
在允许加热的条件下只用一种试剂就可以鉴别硫酸铵氯化钾氯化镁硫酸铝和硫酸铁溶液这种试剂是
NaOH
NH
3
·H
2
O
AgNO
3
BaCl
2
硫酸铁铵[aFe2SO43·bNH42SO4·cH2O]广泛用于城镇生活饮用水工业循环水的净化处理等
聚合硫酸铁SPFS可表示成FexOHySO4z·nH2O它是一种黄色固体是一种重要的无机高分子
硫酸铁铵[aFe2SO43·bNH42SO4·cH2O]广泛用于城镇生活饮用水工业循环水的净化处理等
黄色固体聚合硫酸铁SPFS是一种重要的无机高分子絮凝剂极易溶于水作为工业和生活污水处理等领域具有重要
佛尔哈德法的指示剂是
NH4SCN
AgNO3
NH4Fe（SO4）2 ·12H2O
Fe2+
聚合硫酸铁SPFS可表示成FexOHySO4z·nH2O它是一种黄色固体是一种重要的无机高分子
2.下列反应的离子方程式书写正确的是
向明矾溶液中加入等物质的量的Ba(OH)2溶液 Al3++2SO42-+2Ba2++4OH-=AlO2-+2BaSO4↓+2H2O.
向Fe2(SO4)3溶液中通入足量的H2S. Fe3++H2S=Fe2++S↓+2H+
向硝酸银溶液中滴加过量氨水 Ag++2NH3·H2O=［Ag(NH3)2］++2H2O.
含等物质的量的硫酸氢铵与氢氧化钠两种溶液混合： NH4++HSO4-+2OH-=SO42-+NH3↑＋2H2O.
若配置浓度为100ug/mL应称取0.7022g硫酸亚铁铵 NH42FeSO42·6H2O溶于少量纯
在复盐NH4FeSO42溶液中逐滴加入BaOH2溶液可能发生的反应的离子方程式是
选项A
选项B
选项C
选项D
硫酸盐检查标准SO42-溶液配制需用
三氧化二砷
氯化钠
硫酸铁铵
硝酸铅
硫酸钾
废旧显示屏玻璃中含SiO2Fe2O3CeO2FeO等物质.某课题小组以此玻璃粉末为原料制得CeOH4
黄色固体聚合硫酸铁SPFS是一种重要的无机高分子絮凝剂极易溶于水作为工业和生活污水处理等领域具有重要
黄色固体聚合硫酸铁SPFS是一种重要的无机高分子絮凝剂极易溶于水作为工业和生活污水处理等领域具有重要
硫酸亚铁是一种重要的化工原料可以制备一系列物质如图所示下列说法错误的是
碱式硫酸铁水解能产生Fe（OH）
3
胶体，可用作净水剂
为防止NH
4
HCO
3
分解，生产FeCO
3
需在较低温度下进行
可用KSCN溶液检验（NH
4
）
2
Fe（SO
4
）
2
是否被氧化
常温下，（NH
4
）
2
Fe（SO
4
）
2
比FeSO
4
易溶
配制硫酸亚铁铵NH42FeSO42﹒6H2O标准溶液时须加数 滴以防硫酸亚铁铵水解
HCl
HNO3
H3PO4
H2SO4
佛尔哈德法的指示剂是
NH4SCN
AgNO3
NH4Fe（SO4）2·12H2O
二氧化铈CeO2是一种重要的稀土氧化物平板电视显示屏生产过程中产生大量的废玻璃粉末含SiO2Fe2O
聚合硫酸铁SPFS可表示成FexOHySO4z·nH2O它是一种黄色固体是一种重要的无机高分子
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计算
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将下列各式分解因式 8a3-2aa+12
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用适当的方法计算 ．
25分最近我国许多城市出现了严重的雾霾天气.假设你是李华请用英语写一篇短文主要内容包括 1.雾霾天气出现的危害使能见度降低进而影响交通对人体健康也有危害 2.雾霾天气出现的原因大气污染汽车尾气…等 3.避免出现雾霾天气的措施较少大气污染植树造林等等. 注意1.词数120左右 2.可适当增加细节以使行文连贯.参考词汇雾霾haze.
已知xm=4xn=8mn是正整数那么x3m-n等于
6分OnNov.181995ItzhakPerlmantheviolinistcameonstagetogiveaconcertatAveryFisherHallatLincolnCenterinNewYorkCity. IfyouhaveeverbeentoaPerlmanconcertyouknowthatgettingonstageisnosmallachievementforhim.Hewasstrickenwithpolio小儿麻痹症asachildandsohehasbraces支架onbothlegsandwalkswiththeaidoftwocrutches双拐. Hewalkspainfullyyetmajesticallyuntilhereacheshischair.Thenhesitsdownslowlyputshiscrutchesonthefloorundoestheclaspsonhislegstucksonefootbackandextendstheotherfootforward.Thenhebendsdownandpicksuptheviolinputsitunderhischinnodstotheconductorandproceedstoplay. Butthistimesomethingwentwrong.Justashefinishedthefirstfewbars小节oneofthestringsonhisviolinbroke.Youcouldhearitsnap嘣断﹣﹣﹣itwentofflikegunfireacrosstheroom.Therewasnomistakingwhatthatmeant.Therewasnomistakingwhathehadtodo. Wefiguredthathewouldhavetogetupputontheclaspsagainpickupthecrutchesandlimphiswayoffstage﹣﹣toeitherfindanotherviolinorelsefindanotherstringforthisone.Buthedidn't.Insteadhewaitedamomentclosedhiseyesandthensignaledtheconductortobeginagain. Theorchestrabeganandheplayedfromwherehehadleftoff.Andheplayedwithsuchpassionandsuchpowerandsuchpurityastheyhadneverheardbefore. Whenhefinishedtherewasanawesomesilenceintheroom.Andthenpeopleroseandcheered.Hesmiledwipedthesweatfromthisbrowraisedhisbowtoquitusandthenhesaidinaquiettone.Youknowsometimesitistheartist'stasktofindouthowmuchmusicyoucanstillmakewithwhatyouhaveleft.'' 1.Bysayinggettingonstageisnosmallachievementforhimtheauthorreallymeans. A.it'sverydifficultforItzhakPerlmantoplaytheviolinwiththreestrings B.it'snoteasyforItzhakPerlmantogetonthestagebecauseheisdisabledc C.it'snoteasyforltzhakPerlmantofacesuchalargeaudience D.it'sreallygreatachievementsforltzhakPerlmantoplaytheviolinwiththreestrings 2.ItzhakPerlmanwhenoneofthestringsoftheviolinbroke. A.gaveupplaying B.didn'tknowwhattodo C.wentonplayingthesamepieceofmusic D.wentonplayingadifferentpiece 3.ItzhakPerlmancanbebestdescribedasamanwhois. A.clever B.strongwilled C.humorous D.quiteskilled
将x2-4x-1分解因式得
计算 2y5-6y4+3y2÷-2y2．
10分Basketballisagreatsportthatisnotonlyfunbutalsobringschildrenmanybenefitsindifferentways.1.Playingbasketballhasphysicalbenefits.Childrenarefullofenergy﹣theyneedtomovejumpandrunconstantly.Basketballwillallowthemtocontrolthatenergyinapositiveway.It'safull﹣bodysport.2Sinceit'safastanddynamicsportchildrenneedtofollowthegameandthecontinuousmovementoftheball.Theballmovesquicklyfromonesideofthecourttotheotherandthekidsmoveatthesamepacewhichhelpsimprovebothresistanceandspeed.Playingbasketballhascognitive认知的benefits.Childrenwhopracticeplayingbasketballdevelopskillsthathelpthemfightagainstopponentsandmovearoundthecourt.Thissporthelpsthemincreasetheirabilitytoconcentrate.3Childrenwilllearntoassesssurroundingsituationsandproblemsthatmayariseandthenfindthebestandfastestsolution.Thefastpaceofthegameencouragesquickdecision﹣makingandstimulatestheirconcreteandabstractthinking.4Sinceit'sateamsportbasketballpromotessociabilitycoexistenceandrespectamongpeers.It'sidealforshychildrenbecausetheywillhavetolearntointeractwithotherplayers.Thisisimportantbothtogetbetteratthesportandtohavemorefun.Theywillalsolearnimportantvalueslikecooperationteamworkandcompetitiveness.5Infacttherearemanyotherbenefits.Themostimportantthingisthatit'saveryfastandfunsport.Thistendstomakethevastmajorityofchildrenenjoyit.A.Playingbasketballjusthasentertainingbenefits.B.Playingbasketballhassocialandemotionaladvantages.C.Thesearenotalloftheadvantagesofplayingbasketball.D.Thismeansthatitstrengthensmusclesintheirwholebody.E.Italsomakesthemmoreawareoftheenvironmentaroundthem.F.Thissportpromoteshealthydevelopmentinchildrenforanumberofreasons.G.Howevertherearesomedisadvantageswhenchildrenkeeprunningonthecourt.
将下列各式分解因式m2-4m2+4m2-16m．
计算 a-3ba+3b-2ab-3b22÷-b2
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