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6、(2010·长沙模拟)已知同温度下的溶解度:Zn(OH)2>ZnS,MgCO3>Mg(OH)2;就溶解或电离出的能力而言,FeS>H2S>CuS,则下列离子方程式错误的是(   )

A.Mg2+ + 2HCO3 + 2Ca2+ + 4OH = Mg(OH)2↓+ 2CaCO3↓+ 2H2O

B.Cu2+ + H2S = CuS↓+ 2H+

C.Zn2+ + S2 + 2H2O = Zn(OH)2↓+ H2S↑

D.FeS + 2H+ = Fe2+ + H2S↑                 

 [解析]选C。C项,溶解度:Zn(OH)2>ZnS,所以Zn2+与S2反应生成ZnS。

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5、(2010·淄博模拟)下列说法正确的是(   )

    ①非金属氧化物一定不是碱性氧化物

    ②NH4HSO4溶液的pH比NH4NO3溶液的pH小

    ③含有阴离子的物质中一定含有阳离子

    ④常温下在pH=3的溶液中,K+、Fe2+、C1、CO32不能大量共存

    ⑤SO2具有漂白性,所以向酸性高锰酸钾溶液中通入SO2溶液褪色

    A.①②③④⑤     B.①②③④       C.①③④        D.①④⑤

[解析]选B。碱性氧化物都是金属氧化物;NH4HSO4完全电离出H+,c (H+)比NH4NO3溶液大,pH小;含有阴离子的物质中一定含有阳离子;pH=3的溶液中含有大量H+与CO32不能大量共存;SO2使酸性高锰酸钾溶液褪色是因为SO2具有还原性。

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4、(2010·哈尔滨模拟)某溶液中存在,且X为短周期元素,则一定能在溶液中大量共存的离子组

是(   )

A.Na+、H+、SO、I        B.Na+、Ba2+、SO、Al3+

C.Na+、K+、Fe2+、H+             D.K+、SO、Cl、CO

[解析]选D。中X显+5可能为N元素,可能为N O3,A项,N O3与 H+共存时,有强氧化性,不能与I共存;  B项,Ba2+与SO反应产生BaSO4沉淀,不能共存;C项,N O3、 H+ 与Fe2+不能共存;D项,各离子可大量共存。

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3、(2010·衡水模拟)向三份0.1mol·L-1 NH4Cl溶液中分别加入少量的Mg、NaOH、FeSO4固体(忽略溶液

体积变化),则NH4+浓度的变化依次为(  )

A.减小、增大、减小         B.增大、减小、减小

C.减小、增大、增大         D.减小、减小、增大 

[解析]选D  。NH4Cl水解,溶液显酸性,Mg与H+反应,促进NH4+水解,NH4+浓度减小;NaOH与NH4Cl反应产生NH3,NH4+浓度减小,FeSO4中Fe2+抑制NH4+水解,NH4+浓度增大 。

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2、(2010·广州模拟)下列说法正确的是(  )

①CH3COONa、BaSO4都是强电解质; ②硬铝、碳素钢都是合金材料;③合成纤维、光导纤维都是有机高分子化合物;④ 0.1 mol·L-1 NaOH溶液与0.1 mol·L-1 Ba(OH)2 溶液的PH相同;⑤适量CO2 分别通入饱和碳酸钠溶液和澄清石灰水中,都会出现浑浊。

  A.①②④      B.①②⑤     C.②③⑤     D.③④⑤

[解析]选B。大部分盐都是强电解质;硬铝是含铝、锰、硅等的合金,钢是铁、碳合金;光导纤维的主要成分是二氧化硅,不是有机高分子化合物;0.1 mol·L-1 NaOH溶液与0.1 mol·L-1 Ba(OH)2 溶液相比,前者的c (OH-)小,PH小;CO2 通入饱和碳酸钠溶液会产生NaHCO3晶体,少量CO2 通入澄清石灰水中产生CaCO3沉淀。

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1、(2010·福州模拟)已知298K时,Mg(OH)2的溶度积常数KSP=5.6×1012,取适量的MgCl2溶液,加入一定量的烧碱溶液达到沉淀溶解平衡,测得Ph=13.0,则下列说法不正确的是(  )

[解析]选C。A项,PH=13的溶液中,c (H+)=1013mol/L;B项,溶液中 c (OH-)=101 mol/L,NaOH抑制水的电离,水电离产生的c (OH-)=1013 mol/L;C项,因为向MgCl2溶液中加NaOH溶液后混合溶液的PH=13,所以所加NaOH溶液PH>13;D项,溶液中的c (Mg2+)=5.6×1012÷102=5.6×1010 mol/L。

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15.broke up

全 品中考网

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根据课文内容用适当的词填空,使短文完整。

Nowadays bands 1.________ one after another both in China and in other countries.Then 2.________ do people get to form a band? Usually bands are formed by music lovers 3.________ come together to write and play their own music.First,they may play to 4.________ to earn money to make a living,and at the same time 5.________ their music and improve themselves.

6.________,there was a band called “The Monkees”which wasn’t formed 7.________.It was formed by TV organizers who had 8.________ for four musicians in a newspaper.At first not 9.________ the members in the band could sing well,neither could they create their 10.________ music.They 11.________ on each other while playing music.Both the jokes and music were 12.________ loosely on the band called “The Beatles”.In spite of this,the band soon attracted many people,who supported them 13.________.After a year 14.________,they began to play their own instruments and write their own music.And they became even more popular than “The Beatles” and sold even more records.However,the band 15.________ in 1970,but reunited in the mid­1980s.

答案:e into being 2.how 3.who 4.passers­by 5.practise 6.However 7.this way 8.advertised 9.all 10.own 11.played jokes 12.based 13.fiercely 14.or so

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5.The wonderful performances of the folk bands attract many passers­by,making them as happy as the performers.

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