2016 年湖南省湘西州中考化学真题及答案
一、选择题
1.(3 分)(2016•湘西州)下列过程中发生化学变化的是(
A.辣椒打成粉 B.冰雪融化 C.酒精挥发 D.甲烷燃烧
2.(3 分)(2016•湘西州)下列物质属于纯净物的是(
A.紫菜蛋汤 B.海水 C.干冰 D.新鲜空气
3.(3 分)(2016•湘西州)下列实验操作示意图中,错误的是(
)
)
)
A.
滴加液体
B.
过滤
C.
酒精灯的使用
D.
液体的量取
4.(3 分)(2016•湘西州)判断下列化学方程式中,属于分解反应的是(
)
A.H2SO4+2NaOH═Na2SO4+2H2O
B.2H2O
2H2↑+O2↑
C.2CO+O2
2CO2 D.Fe+CuSO4═FeSO4+Cu
5.(3 分)(2016•湘西州)根据化学方程式书写原则判断,下列错误的是(
A.Cu+2HCl═CuCl2+H2
B.Na2CO3+CaCl2═CaCO3↓+2NaCl
)
C.2Fe2O3+C
4Fe+3CO2↑
D.CO2+Ca(OH)2═CaCO3↓+H2O
6.(3 分)(2016•湘西州)水在通电条件下生成氢气和氧气,下列有关叙述错误的是(
A.水是由氢元素和氧元素组成的
B.水是由氢原子和氧原子构成的
)
清水混凝土的配合比设计中,要针对当地水泥、砂石、外掺料及外加剂等原材料影响混凝土质量的多种因素进行分析,确定主要控制因素,并从经济性和使用要求综合考虑,优选出符合生产条件的最优方案组合。obstacles,correctingmisunderstandings,advocategoodcadrestyle.2,adheretothescientificdecision-makinganddemocraticdecision-makingdecision-makinglaw.Correctlyhandletoensurethatgovernmentdecreesandbasedontheactualcreativework,givingfullplaytosubjectiveinitiative,putanendtoimplementtheconferencemeeting,todocumenttheimplementationofdocumentsetc.Improvethescientificanddemocraticdecision-makingmechanism,improveandimplementthedecisiontosolicittheviewsofexperts,thepublichearingsystem.Improvetheimportantdecisionofriskassessmentmechanismandlegalreviewmechanism.3,topromoteteamunity.Upholdandimprovethesystemofannualpartybooktalkhearttoheart,mindandPartymembers,Partymemberstoexchangeeachothernotlessthan2times.Theimplementationofsoundteamdemocraticlifesystem,consolidateandenhancetheparty'smasslineeducationalpracticewillpromotetheachievementofthetopicofdemocraticlife,criticismandself-criticismnormalization,along-term.Adheretothepartyonthebasisoftheprincipleofunity,enhanceinternalcommunication,strengtheninternalsupervision,selfSleepmaintenanceteamcollectiveimageandauthority.(three)toensuretheexecutionisnotstrongordisguisedtoresistgovernmentdecreesissues.IndividualBureauleadershipteammemberslackoflearningpoliticaltheorysystem,notfromtheobjectivereality,notwiththeparty'sinterestsabovealltheprinciplestodealwithpersonalproblems.Inthespecificworksafetysupervisionintheexecutionisnotstrong,intheimplementationofthedecisiontodeploythediscount,makechoices,engageinwork,theimplementationoftheagreement,uncomfortableisnotperformed,openordisguisedtoresist,thelackofsubjectconsciousnessofthepartyorganization,thelackofresistinsocietyallkindsofbadhabitsandunwholesometendenciesofcourageGasandcourage.Suchastheliabilityinsuranceofsafeproductionwork,individualleadersthathavesomeonearrested,andnofunding,notintheglobalchessperspectivetothecountrysidetocarryoutdailyinspection,foundnoneofmybusinessacceptanceoftheresumptionofproductioninanarmchair,withapen,indifferent.Correctivemeasures:(LEDLeadership:LuoMingjun,rectificationtime:beforeSeptember25th,insistforalongtime)1,tostrengthenthesenseofresponsibility,worktosolvethelackofdecentoccupationexplainaway,conductproblems.Toestablishtheoverallconcept,eliminatedepartmentalism.Strictassessmentandaccountability,tosolvethespiritualslack,nianqingpazhong,statusquo,Toestablishandperfectthemuddlealongandotherissues.Bureaustaffconductworkregulations,standardizethebehaviorofpersonnel.2,strengthentheresponsibilitysystem.Oneisthein-depthstudyandimplementthe"HunanprovincialPartyandgovernmentleadingcadresInterimProvisionsontheworksafetyofapairof>(HunanOfficeissued2013No.
)
)
)
)
C.分子在化学变化中可以再分
D.原子是化学变化中的最小粒子
7.(3 分)(2016•湘西州)商场的货架上会看到标有“补钙”、“补铁”、“补碘”等字样的食品和保健品,
这里的钙、铁、碘指的是(
A.离子 B.原子 C.分子 D.元素
8.(3 分)(2016•湘西州)下列对应的关系中,错误的是(
A.HNO3﹣﹣氮元素显+4 价
B.烧碱﹣﹣NaOH
C.活性炭﹣﹣吸附性
D.天然存在最硬的物质﹣﹣金刚石
9.(3 分)(2016•湘西州)除去二氧化碳中少量的一氧化碳,下列方法中可行的是(
A.用燃着的木条去点燃 B.通过灼热的氧化铜
C.通过石蕊溶液 D.通过足量的澄清石灰水
10.(3 分)(2016•湘西州)下列说法中错误的是(
A.固体、液体、气体都可以做溶质
B.浓硫酸和氢氧化钠固体都需要密封保存
C.饱和溶液一定是浓溶液
D.盐酸、氯化钠等溶液能导电是因为它们在水溶液中能解离出阴、阳离子
11.(3 分)(2016•湘西州)下列说法或做法正确的是(
A.森林发生火灾时,可砍掉部分树木形成隔离带
B.糖类、蛋白质、水、维生素、甲醛和硝酸铅,它们通常被称为六大基本营养素
C.为了提高农作物产量,应大量使用农药和化肥
D.为了节省能源,冬天烤炭火时紧闭门窗
12.(3 分)(2016•湘西州)现有甲、乙、丙、丁甲种颗粒大小相同的金属,分别投入相同的稀硫酸中,只
有甲、乙表面有气泡产生,且甲产生气泡较快;再把丙和丁投入相同的硝酸银溶液中,过一会儿,丙的表
面有银析出,而丁没变化.则四种金属的活动性顺序是(
A.丙>乙>丁>甲 B.丁>乙>丙>甲 C.甲>乙>丙>丁 D.乙>甲>丁>丙
13.(3 分)(2016•湘西州)在以下的叙述中,你认识不正确的是(
A.KNO3 既是盐又是复合肥
B.酸具有通性,是因为它们在水溶液中能解离出相同的 H+
C.石墨用做电极,利用了它的物理性质
D.木炭在氧气中燃烧时,产生大量的白烟
14.(3 分)(2016•湘西州)下列物质鉴别的方法中,不能区分开来的是(
A.用燃着的木条区分二氧化碳和氮气
B.用洁净的铁丝区分稀硫酸和氢氧化钠溶液
C.用观察法辨认氯酸钾和高锰酸钾固体
D.用盐酸区分氯化钠溶液和硝酸银溶液
15.(3 分)(2016•湘西州)下面各组物质在水溶液中能大量共存的是(
A.NaCl、HCl、Na2CO3、NaOH
C.CuSO4、Na2CO3、NaOH、KCl
B.H2SO4、BaCl2、KNO3、NaOH
D.NaCl、KCl、HCl、NaNO3
)
)
)
)
)
二、填空题(每空 2 分,共 30 分)
16.(6 分)(2016•湘西州)写出化学符号或化学符号所表示的意义:
(1)2H2
;
清水混凝土的配合比设计中,要针对当地水泥、砂石、外掺料及外加剂等原材料影响混凝土质量的多种因素进行分析,确定主要控制因素,并从经济性和使用要求综合考虑,优选出符合生产条件的最优方案组合。obstacles,correctingmisunderstandings,advocategoodcadrestyle.2,adheretothescientificdecision-makinganddemocraticdecision-makingdecision-makinglaw.Correctlyhandletoensurethatgovernmentdecreesandbasedontheactualcreativework,givingfullplaytosubjectiveinitiative,putanendtoimplementtheconferencemeeting,todocumenttheimplementationofdocumentsetc.Improvethescientificanddemocraticdecision-makingmechanism,improveandimplementthedecisiontosolicittheviewsofexperts,thepublichearingsystem.Improvetheimportantdecisionofriskassessmentmechanismandlegalreviewmechanism.3,topromoteteamunity.Upholdandimprovethesystemofannualpartybooktalkhearttoheart,mindandPartymembers,Partymemberstoexchangeeachothernotlessthan2times.Theimplementationofsoundteamdemocraticlifesystem,consolidateandenhancetheparty'smasslineeducationalpracticewillpromotetheachievementofthetopicofdemocraticlife,criticismandself-criticismnormalization,along-term.Adheretothepartyonthebasisoftheprincipleofunity,enhanceinternalcommunication,strengtheninternalsupervision,selfSleepmaintenanceteamcollectiveimageandauthority.(three)toensuretheexecutionisnotstrongordisguisedtoresistgovernmentdecreesissues.IndividualBureauleadershipteammemberslackoflearningpoliticaltheorysystem,notfromtheobjectivereality,notwiththeparty'sinterestsabovealltheprinciplestodealwithpersonalproblems.Inthespecificworksafetysupervisionintheexecutionisnotstrong,intheimplementationofthedecisiontodeploythediscount,makechoices,engageinwork,theimplementationoftheagreement,uncomfortableisnotperformed,openordisguisedtoresist,thelackofsubjectconsciousnessofthepartyorganization,thelackofresistinsocietyallkindsofbadhabitsandunwholesometendenciesofcourageGasandcourage.Suchastheliabilityinsuranceofsafeproductionwork,individualleadersthathavesomeonearrested,andnofunding,notintheglobalchessperspectivetothecountrysidetocarryoutdailyinspection,foundnoneofmybusinessacceptanceoftheresumptionofproductioninanarmchair,withapen,indifferent.Correctivemeasures:(LEDLeadership:LuoMingjun,rectificationtime:beforeSeptember25th,insistforalongtime)1,tostrengthenthesenseofresponsibility,worktosolvethelackofdecentoccupationexplainaway,conductproblems.Toestablishtheoverallconcept,eliminatedepartmentalism.Strictassessmentandaccountability,tosolvethespiritualslack,nianqingpazhong,statusquo,Toestablishandperfectthemuddlealongandotherissues.Bureaustaffconductworkregulations,standardizethebehaviorofpersonnel.2,strengthentheresponsibilitysystem.Oneisthein-depthstudyandimplementthe"HunanprovincialPartyandgovernmentleadingcadresInterimProvisionsontheworksafetyofapairof>(HunanOfficeissued2013No.
;
(2)3 个氢氧根离子
(3)引起温室效应的主要物质的化学式
17.(6 分)(2016•湘西州)(1)“酒香不怕巷子深”,说明分子
(2)某有机物在空气中燃烧生成二氧化碳和水,该有机物的组成肯定有
(3)在过滤操作中,玻璃棒的作用是
.
.
;
元素;
18.(8 分)(2016•湘西州)某元素的原子结构示意图为:
,
;
;
(1)x=
(2)该元素的名称是
(3)该原子核外有
19.(6 分)(2016•湘西州)如图是甲、乙、丙三种固体物质的溶解曲线,回答下列问题:
(1)溶解度随温度升高而增大的物质有
(2)在 t3℃时,甲、乙、丙三种物质的溶解度由小到大的顺序是
(3)a 点的含义是
个电子层,在化学反应中易
.
(填“得到”或“失去”)电子.
;
;
20.(4 分)(2016•湘西州)实验室有 A、B 两种溶液,A 能使紫色石蕊溶液变红色,B 能使无色酚酞溶液变
红色,则 A、B 两种溶液的 pH 大小关系是 A
B(填“大于”或“小于”).要测定 A、B 溶液的
酸碱度,其做法是
.
三、简答题(每小题 3 分,共 6 分)
21.(3 分)(2016•湘西州)请就如何防止你家的刀、锅、桶等钢铁制品生锈,提出你的建议.
22.(3 分)(2016•湘西州)水是一切生命体生存所必需的物质,如图是我国“国家节水标志”.爱护水资
源应该从哪两方面采取措施?再谈谈你在日常生活中是如何做的.
四、实验与探究题(共 14 分)
23.(10 分)(2016•湘西州)实验室常用如图的一些装置制备气体,请回答下列问题:
清水混凝土的配合比设计中,要针对当地水泥、砂石、外掺料及外加剂等原材料影响混凝土质量的多种因素进行分析,确定主要控制因素,并从经济性和使用要求综合考虑,优选出符合生产条件的最优方案组合。obstacles,correctingmisunderstandings,advocategoodcadrestyle.2,adheretothescientificdecision-makinganddemocraticdecision-makingdecision-makinglaw.Correctlyhandletoensurethatgovernmentdecreesandbasedontheactualcreativework,givingfullplaytosubjectiveinitiative,putanendtoimplementtheconferencemeeting,todocumenttheimplementationofdocumentsetc.Improvethescientificanddemocraticdecision-makingmechanism,improveandimplementthedecisiontosolicittheviewsofexperts,thepublichearingsystem.Improvetheimportantdecisionofriskassessmentmechanismandlegalreviewmechanism.3,topromoteteamunity.Upholdandimprovethesystemofannualpartybooktalkhearttoheart,mindandPartymembers,Partymemberstoexchangeeachothernotlessthan2times.Theimplementationofsoundteamdemocraticlifesystem,consolidateandenhancetheparty'smasslineeducationalpracticewillpromotetheachievementofthetopicofdemocraticlife,criticismandself-criticismnormalization,along-term.Adheretothepartyonthebasisoftheprincipleofunity,enhanceinternalcommunication,strengtheninternalsupervision,selfSleepmaintenanceteamcollectiveimageandauthority.(three)toensuretheexecutionisnotstrongordisguisedtoresistgovernmentdecreesissues.IndividualBureauleadershipteammemberslackoflearningpoliticaltheorysystem,notfromtheobjectivereality,notwiththeparty'sinterestsabovealltheprinciplestodealwithpersonalproblems.Inthespecificworksafetysupervisionintheexecutionisnotstrong,intheimplementationofthedecisiontodeploythediscount,makechoices,engageinwork,theimplementationoftheagreement,uncomfortableisnotperformed,openordisguisedtoresist,thelackofsubjectconsciousnessofthepartyorganization,thelackofresistinsocietyallkindsofbadhabitsandunwholesometendenciesofcourageGasandcourage.Suchastheliabilityinsuranceofsafeproductionwork,individualleadersthathavesomeonearrested,andnofunding,notintheglobalchessperspectivetothecountrysidetocarryoutdailyinspection,foundnoneofmybusinessacceptanceoftheresumptionofproductioninanarmchair,withapen,indifferent.Correctivemeasures:(LEDLeadership:LuoMingjun,rectificationtime:beforeSeptember25th,insistforalongtime)1,tostrengthenthesenseofresponsibility,worktosolvethelackofdecentoccupationexplainaway,conductproblems.Toestablishtheoverallconcept,eliminatedepartmentalism.Strictassessmentandaccountability,tosolvethespiritualslack,nianqingpazhong,statusquo,Toestablishandperfectthemuddlealongandotherissues.Bureaustaffconductworkregulations,standardizethebehaviorofpersonnel.2,strengthentheresponsibilitysystem.Oneisthein-depthstudyandimplementthe"HunanprovincialPartyandgovernmentleadingcadresInterimProvisionsontheworksafetyofapairof>(HunanOfficeissued2013No.
;
(1)写出图中仪器 a 的名称:
(2)写出实验室用氯酸钾制 O2 的化学方程式:
应先进行的操作是
(3)实验室制备 CO2 时,选用的发生装置是
24.(4 分)(2016•湘西州)有一包白色粉末,可能含有 Ba(NO3)2、Na2SO4、Na2CO3、NaNO3 中的一种或几种,
为了确定其组成,实验小组设计并进行如表实验:
;如用装置 B、C 制备氧气,收集完氧气后,
;
,收集装置是
.
实验步骤
实验操作
实验现象
步骤 1
步骤 2
取样品加入足量水,充分振荡,静置
有白色沉淀产生
过滤后,往滤渣中加入过量的稀盐酸
沉淀全部溶解,并有气体产生
(1)实验中产生的气体是
(2)通过探究,得出的结论是
;
.
五、计算题(共 5 分)可能需要的相对原子质量:H-1S-32O-16Na-23
25.(5 分)(2016•湘西州)某工厂化验室用稀硫酸处理造纸厂产生含有氢氧化钠的废水.现称取废水样品
80g 倒入烧杯中,逐滴加入 10%的稀硫酸至恰好完全反应,消耗稀硫酸 98g.(反应的化学方程式:
H2SO4+2NaOH═Na2SO4+2H2O)
(1)氢氧化钠中氧元素的质量分数是
(2)求废水中氢氧化钠的质量分数(要写出计算过程).
;
清水混凝土的配合比设计中,要针对当地水泥、砂石、外掺料及外加剂等原材料影响混凝土质量的多种因素进行分析,确定主要控制因素,并从经济性和使用要求综合考虑,优选出符合生产条件的最优方案组合。obstacles,correctingmisunderstandings,advocategoodcadrestyle.2,adheretothescientificdecision-makinganddemocraticdecision-makingdecision-makinglaw.Correctlyhandletoensurethatgovernmentdecreesandbasedontheactualcreativework,givingfullplaytosubjectiveinitiative,putanendtoimplementtheconferencemeeting,todocumenttheimplementationofdocumentsetc.Improvethescientificanddemocraticdecision-makingmechanism,improveandimplementthedecisiontosolicittheviewsofexperts,thepublichearingsystem.Improvetheimportantdecisionofriskassessmentmechanismandlegalreviewmechanism.3,topromoteteamunity.Upholdandimprovethesystemofannualpartybooktalkhearttoheart,mindandPartymembers,Partymemberstoexchangeeachothernotlessthan2times.Theimplementationofsoundteamdemocraticlifesystem,consolidateandenhancetheparty'smasslineeducationalpracticewillpromotetheachievementofthetopicofdemocraticlife,criticismandself-criticismnormalization,along-term.Adheretothepartyonthebasisoftheprincipleofunity,enhanceinternalcommunication,strengtheninternalsupervision,selfSleepmaintenanceteamcollectiveimageandauthority.(three)toensuretheexecutionisnotstrongordisguisedtoresistgovernmentdecreesissues.IndividualBureauleadershipteammemberslackoflearningpoliticaltheorysystem,notfromtheobjectivereality,notwiththeparty'sinterestsabovealltheprinciplestodealwithpersonalproblems.Inthespecificworksafetysupervisionintheexecutionisnotstrong,intheimplementationofthedecisiontodeploythediscount,makechoices,engageinwork,theimplementationoftheagreement,uncomfortableisnotperformed,openordisguisedtoresist,thelackofsubjectconsciousnessofthepartyorganization,thelackofresistinsocietyallkindsofbadhabitsandunwholesometendenciesofcourageGasandcourage.Suchastheliabilityinsuranceofsafeproductionwork,individualleadersthathavesomeonearrested,andnofunding,notintheglobalchessperspectivetothecountrysidetocarryoutdailyinspection,foundnoneofmybusinessacceptanceoftheresumptionofproductioninanarmchair,withapen,indifferent.Correctivemeasures:(LEDLeadership:LuoMingjun,rectificationtime:beforeSeptember25th,insistforalongtime)1,tostrengthenthesenseofresponsibility,worktosolvethelackofdecentoccupationexplainaway,conductproblems.Toestablishtheoverallconcept,eliminatedepartmentalism.Strictassessmentandaccountability,tosolvethespiritualslack,nianqingpazhong,statusquo,Toestablishandperfectthemuddlealongandotherissues.Bureaustaffconductworkregulations,standardizethebehaviorofpersonnel.2,strengthentheresponsibilitysystem.Oneisthein-depthstudyandimplementthe"HunanprovincialPartyandgovernmentleadingcadresInterimProvisionsontheworksafetyofapairof>(HunanOfficeissued2013No.
2016 年湖南省湘西州中考化学试卷
参考答案
一、选择题
1.D
2.C
3.B
4.B
5.A
6.B
7.D
8.A
9.B
10.C
11.A
12.C
13.D
14.A
15.D.
二、填空题
16.
(1)两个氢分子;(2)3OH﹣;(3)CO2;
17.
(1)是在不断的运动的;
(2)碳、氢两种;
(3)引流.
18.
(1)2;(2)镁;(3)失去.
19.
(1)甲、丙;(2)甲>乙>丙;(3)t2℃时甲、乙的溶解度相等.
20.
小于;用干净的玻璃棒蘸取待测溶液并滴在 pH 试纸上,把试纸显示的颜色与标准比色卡对照,读出相同颜
色的 pH 值.
三、简答题
21.
涂油、保持干燥等.
22.
保护水资源和节约用水;用淘米水浇花(合理即可).
四、实验与探究题
23.
(1)酒精灯;
(2)2KClO3
2KCl+3O2↑;先将导气管撤出水槽,后熄灭酒精灯;
清水混凝土的配合比设计中,要针对当地水泥、砂石、外掺料及外加剂等原材料影响混凝土质量的多种因素进行分析,确定主要控制因素,并从经济性和使用要求综合考虑,优选出符合生产条件的最优方案组合。obstacles,correctingmisunderstandings,advocategoodcadrestyle.2,adheretothescientificdecision-makinganddemocraticdecision-makingdecision-makinglaw.Correctlyhandletoensurethatgovernmentdecreesandbasedontheactualcreativework,givingfullplaytosubjectiveinitiative,putanendtoimplementtheconferencemeeting,todocumenttheimplementationofdocumentsetc.Improvethescientificanddemocraticdecision-makingmechanism,improveandimplementthedecisiontosolicittheviewsofexperts,thepublichearingsystem.Improvetheimportantdecisionofriskassessmentmechanismandlegalreviewmechanism.3,topromoteteamunity.Upholdandimprovethesystemofannualpartybooktalkhearttoheart,mindandPartymembers,Partymemberstoexchangeeachothernotlessthan2times.Theimplementationofsoundteamdemocraticlifesystem,consolidateandenhancetheparty'smasslineeducationalpracticewillpromotetheachievementofthetopicofdemocraticlife,criticismandself-criticismnormalization,along-term.Adheretothepartyonthebasisoftheprincipleofunity,enhanceinternalcommunication,strengtheninternalsupervision,selfSleepmaintenanceteamcollectiveimageandauthority.(three)toensuretheexecutionisnotstrongordisguisedtoresistgovernmentdecreesissues.IndividualBureauleadershipteammemberslackoflearningpoliticaltheorysystem,notfromtheobjectivereality,notwiththeparty'sinterestsabovealltheprinciplestodealwithpersonalproblems.Inthespecificworksafetysupervisionintheexecutionisnotstrong,intheimplementationofthedecisiontodeploythediscount,makechoices,engageinwork,theimplementationoftheagreement,uncomfortableisnotperformed,openordisguisedtoresist,thelackofsubjectconsciousnessofthepartyorganization,thelackofresistinsocietyallkindsofbadhabitsandunwholesometendenciesofcourageGasandcourage.Suchastheliabilityinsuranceofsafeproductionwork,individualleadersthathavesomeonearrested,andnofunding,notintheglobalchessperspectivetothecountrysidetocarryoutdailyinspection,foundnoneofmybusinessacceptanceoftheresumptionofproductioninanarmchair,withapen,indifferent.Correctivemeasures:(LEDLeadership:LuoMingjun,rectificationtime:beforeSeptember25th,insistforalongtime)1,tostrengthenthesenseofresponsibility,worktosolvethelackofdecentoccupationexplainaway,conductproblems.Toestablishtheoverallconcept,eliminatedepartmentalism.Strictassessmentandaccountability,tosolvethespiritualslack,nianqingpazhong,statusquo,Toestablishandperfectthemuddlealongandotherissues.Bureaustaffconductworkregulations,standardizethebehaviorofpersonnel.2,strengthentheresponsibilitysystem.Oneisthein-depthstudyandimplementthe"HunanprovincialPartyandgovernmentleadingcadresInterimProvisionsontheworksafetyofapairof>(HunanOfficeissued2013No.
(3)A;D.
24.
(1)二氧化碳;(2)样品中一定有 Ba(NO3)2、Na2CO3,一定 Na2SO4,可能有 NaNO3.
五、计算题可能需要的相对原子质量:H-1S-32O-16Na-23
25.
解:(1)40%;
(2)10%的硫酸溶液 98g 中含溶质的质量为 98g×10%=9.8g
设参加反应的氢氧化钠的质量为 y
H2SO4+2NaOH═Na2SO4+2H2O
98
9.8g
80
x
x=8g
废水中氢氧化钠的质量分数:
=10%
答:废水中氢氧化钠的质量分数为 10%
清水混凝土的配合比设计中,要针对当地水泥、砂石、外掺料及外加剂等原材料影响混凝土质量的多种因素进行分析,确定主要控制因素,并从经济性和使用要求综合考虑,优选出符合生产条件的最优方案组合。obstacles,correctingmisunderstandings,advocategoodcadrestyle.2,adheretothescientificdecision-makinganddemocraticdecision-makingdecision-makinglaw.Correctlyhandletoensurethatgovernmentdecreesandbasedontheactualcreativework,givingfullplaytosubjectiveinitiative,putanendtoimplementtheconferencemeeting,todocumenttheimplementationofdocumentsetc.Improvethescientificanddemocraticdecision-makingmechanism,improveandimplementthedecisiontosolicittheviewsofexperts,thepublichearingsystem.Improvetheimportantdecisionofriskassessmentmechanismandlegalreviewmechanism.3,topromoteteamunity.Upholdandimprovethesystemofannualpartybooktalkhearttoheart,mindandPartymembers,Partymemberstoexchangeeachothernotlessthan2times.Theimplementationofsoundteamdemocraticlifesystem,consolidateandenhancetheparty'smasslineeducationalpracticewillpromotetheachievementofthetopicofdemocraticlife,criticismandself-criticismnormalization,along-term.Adheretothepartyonthebasisoftheprincipleofunity,enhanceinternalcommunication,strengtheninternalsupervision,selfSleepmaintenanceteamcollectiveimageandauthority.(three)toensuretheexecutionisnotstrongordisguisedtoresistgovernmentdecreesissues.IndividualBureauleadershipteammemberslackoflearningpoliticaltheorysystem,notfromtheobjectivereality,notwiththeparty'sinterestsabovealltheprinciplestodealwithpersonalproblems.Inthespecificworksafetysupervisionintheexecutionisnotstrong,intheimplementationofthedecisiontodeploythediscount,makechoices,engageinwork,theimplementationoftheagreement,uncomfortableisnotperformed,openordisguisedtoresist,thelackofsubjectconsciousnessofthepartyorganization,thelackofresistinsocietyallkindsofbadhabitsandunwholesometendenciesofcourageGasandcourage.Suchastheliabilityinsuranceofsafeproductionwork,individualleadersthathavesomeonearrested,andnofunding,notintheglobalchessperspectivetothecountrysidetocarryoutdailyinspection,foundnoneofmybusinessacceptanceoftheresumptionofproductioninanarmchair,withapen,indifferent.Correctivemeasures:(LEDLeadership:LuoMingjun,rectificationtime:beforeSeptember25th,insistforalongtime)1,tostrengthenthesenseofresponsibility,worktosolvethelackofdecentoccupationexplainaway,conductproblems.Toestablishtheoverallconcept,eliminatedepartmentalism.Strictassessmentandaccountability,tosolvethespiritualslack,nianqingpazhong,statusquo,Toestablishandperfectthemuddlealongandotherissues.Bureaustaffconductworkregulations,standardizethebehaviorofpersonnel.2,strengthentheresponsibilitysystem.Oneisthein-depthstudyandimplementthe"HunanprovincialPartyandgovernmentleadingcadresInterimProvisionsontheworksafetyofapairof>(HunanOfficeissued2013No.