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Question 1 · Single choice · 中档
元素295118Og 中文名为(气奥) ,是一种人工合成的稀有气体元素,下列说法正确的是( )
A. 核外电子数是 118 B. 中子数是 295 C. 质量数是117 D. 第六周期 0 族元素
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Question 2 · Single choice · 中档
A. 次氯酸漂白 B. 盐酸除锈 C. 石油分馏 D. 煤干馏
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Question 3 · Single choice · 中档
A. 晶体硅熔化 B. 碘升华 C. 熔融Al 2O3 D. NaCl溶于水
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Question 7 · Free response · 中档
已知有一种烃的结构类似自行车,简称“自行车烃”,如图所示,下列关于它的叙述正确的是
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Question 9 · Single choice · 中档
A. 含有共价键的化合物是共价化合物 B. 含有极性键的分子可能是非极性分子 C. 有电子转移的反应是氧化还原反应 D. 水溶液中能完全电离的电解质是强电解质
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Question 10 · Single choice · 中档
用镁带和稀硫酸反应产生氢气来测定氢气的气体摩尔体积,所用的步骤有①冷却至室温,②调节使水准 管和量气管液面持平,③读数。正确的顺序是( )
A. ①②③ B. ①③② C. ③①② D. ③②①
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Question 11 · Single choice · 中档
关于离子化合物 NH5(H 有正价和负价)下列说法正确的是( )
A. N 为+5 价 B. 阴阳离子个数比是 1:1 C. 阴离子为 8 电子稳定结构 D. 阳离子 电子数为 11
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Question 12 · Single choice · 中档
A. 硝酸钡,稀硫酸 B. 稀盐酸,氯化钡 C. 稀硫酸,氯化钡 D. 稀硝酸,氯化钡
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Question 14 · Single choice · 中档
下列物质分离(括号内的物质为杂质)的方法错误的是( )
A. 硝基苯(苯)--蒸馏 B. 乙烯(SO2)--氢氧化钠溶液 C. 己烷(己烯)--溴水,分液 D. 乙酸乙酯(乙醇)--碳酸钠溶液,分液
考点: 物质的分离与提纯易错: 试剂加入顺序错误
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Question 16 · Single choice · 中档
在 pH 为 1 的 100mL0.1mol/L 的 AlCl3 中,加入 300mL0.1mol/L 的氢氧化钠溶液后铝元素的存在形式是 ( )
A. AlO2- B. Al3+ C. Al(OH)3 D. Al3+、Al(OH)3
考点: 氧化铝、氢氧化铝的两性考法: 守恒法
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Question 17 · Single choice · 中档
A. 石墨电极反应 O2+4H++4e→2H2O B. 鼓入少量空气,会加快 Fe 的腐蚀 C. 加入少量 NaCl,会加快 Fe 的腐蚀 D. 加入 HCl,石墨电极反应式:2H++2e→H2
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Question 19 · Single choice · 中档
已知反应式:mX(g)+nY(?) pQ(s)+2mZ(g),已知反应已达平衡,此时$c(X)=0.3mol/L$,其他条件不变, 若容器缩小到原来的12 ,$c(X)=0.5mol/L$,下列说法正确的是( )
A. 反应向逆方向移动 B. Y 可能是固体或液体 C. 系数 n>m D. Z 的体积分数减小
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Question 20 · Single choice · 中档
常温下 0.1mol/L①CH3COOH、②NaOH、③CH3COONa,下列叙述正确的是( )
A. ①中[CH3COOH]>[CH3COO-]>[H+]>[OH-] B. ①②等体积混合后,醋酸根离子浓度小于③的二分之一 C. ①③等体积混合以后,溶液呈酸性,则(Na+)>(CH3COO-)>(H+) D. ①②等体积混合以后,水的电离程度比①③等体积混合的电离程度小
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