开鲁一中2019-2020学年度下学期中考高一年级化学学科答案CDCAA、DBDCDB、BBDBD、CADAC、C22、(1) 放热 (2) 否 (3) 减小(4) H2(g)+ O2(g)=H2O(g) H=-241.8kJ/mol(5) 2H2-4e-+4OH-=4H2O O2+4e-+2H2O=4OH-23(16分)(1) 三 A 略 (2)HCl H2O H2O分子间可形成氢键 (3)SiCl43H2O=H2SiO34HCl (4)SiH4(g)2O2(g)=SiO2(s)2H2O(l)H1520.0 kJmol124、(16分) (1) H2右 (2) 负ClH2OClOH2 2NaCl2H2O2NaOHH2+Cl2(3) 从A到B不变CH3OHH2O6e=6HCO225、 (14分)I、(1)正极CH44O28e=CO22H2O(2)4OH4e=2H2OO21acII、(1)b (2)0.006