18届中考化学试卷及答案

2018(9080)1.23.H1C12N14O16Na23P31K39Ca40482321.ABCD2.A.NB.H2OC.O2D.N23.ABCD4.CrA.CrB.K2Cr2O7C.Cr2(SO4)3D.CrCl25.pHApH=12BpH=4CpH=11DpH=36A.3Fe+2O2Fe3O4B.2H2O2H2+O2C.CO+CuOCu+CO2D.CaCO3+2HCl=CaCl2+CO2+H2O7.ABCD8.328ABCD9ABCD10CxH8CxH8+5O23CO2+4H2O,xA.1B.2C.3D.411ABCD12ABCD13ABCD14C3H6N6ABC126D36615ABCD16LiOHABCD51617213CO2218319420182912Fe2O3204HeMgCa(1)MgCa2He213(1)MgCl2ZnCuSO42MgZnSO4Cu32315+22282+122882+2022612KH2PO4ABCD3234ABCDEFGACFA+BC+DD+EF+GB+EC+G1C2B3B+EC+G24.5Na2CO3NaHCO3,1Na2CO32=2112541AB2AB2671232122216276100g7.4g1020184823212345678910111213141516CDABACBCBCAADDBD5161723CH41183119411123CO+Fe2O32Fe+3CO222041Mg2+(2)1213MgZnCu(1)Zn+CuSO4=Cu+ZnSO4(2)Mg+ZnSO4=Zn+MgSO4323152261CaO+H2O=Ca(OH)2(2)22.8D(3)CO2Ca(OH)2212341H2O1213H2SO4+2NaOH=Na2SO4+2H2O212451Na2CO3+2HCl=2NaCl+H2O+CO2(2)(212112541BA(2)AB(126712(3)H2SO4Fe+H2SO4=FeSO4+H221162762NaOH+CO2=Na2CO3+H2O(1)Na2CO3+Ca(OH)2=CaCO3+2NaOH11x.Na2CO3+Ca(OH)2=CaCO3+2NaOH741007.4gx74100=7.4gxx=10g(1)100g+7.4g-10g=97.4g197.4g10=9.74g19.74g