2018~2019学年度上期高中2017级期中联考化学答案.pdf

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1、1蓉 城 名 校 联 盟 2018 2019 学 年 度 上 期 高 中 2017 级 期 中 联 考化 学 答 案1-5 ACBCD 6-10 CDABC 11-15ADBBC 16-20CBADD 21-22AB23(14分)(1)不移动(2分)(2)正向移动(2分)减小(2分)(3)正向移动(2分)减小(2分)(4)放热反应(2分)(5)C(2分)24(12分)(1)N2(g)+O2(g)=NO2(g) H=+68kJmol-1(2分)C8H18(g)+RO2(g)=8CO2(g)+9H2O(l) H=-5518kJmol-1(2分)(2)2H2H3H1(2分)( 22 22 Oc CO

2、cK)(2分)(3)H=+144.5kJmol-1 (2分)(4)Na2O2(s)+2Na(s)=2Na2O(s) H=(b-a)kJmol-1 (2分)25(14分)(1)先关闭分液漏斗的活塞,再轻轻向外拉(或向内压)注射器的活塞,松手后恢复原位,表明气密性良好。(2分)(2)浓度(2分)(3)2MnO4-+5H2C2O4+6H+=2Mn2+10CO2+8H2O(2分);(4)产物Mn2+是反应的催化剂(1分)该反应为放热反应(1分)(5)探究温度对化学反应速率的影响(1分)实验1和4 (1分)否(1分)因为高锰酸钾的起始浓度不相同,则初始颜色不同,所以褪色的时间不能作为判断依据(1分,合理

3、给分)如果选择MnCl2,则酸性高锰酸钾溶液会和Cl-反应,而且引入Cl-无法证明是Mn2+起了催化作用。(答到任意一点都给2分)26(16分)(1)(2分)(2)催化剂(1分)t2t3(1分)减小压强(1分)升高温度(1分)(3)(2分)(2分)(4)1:1(2分)(5)CO2(g)+3H2(g) CH3OH(g)+H2O(g),这是体积减小的反应,所以增大压强,平衡向正反应方向移动,生成更多的甲醇,所以甲醇的产率增大。(2分)(6)04.12.0075.0 025.0025.0)()( )()( 3232 23 HcCOc OHcOHCHcK 08.14 02.002.0 3(只用代数式表示,不必计算出结果)。(2分)

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