长沙市2020年中考化学模拟试题及答案

120201910090H1C12N14O16Ca40Cl35.536123361ABCD2.BA.B.C.D.3ABCD4100g119mgABCD5ABCD6.A.B.C.D.7pH11AKNO3H2SO4BaCl2CaCl2BK2CO3NaNO3CaCl2KClCNaOHBaCl2KNO3NaNO3DKOHCuSO4NaClKNO38122ABCD9ABCD10SiO2+2CSi+nCOAn1BCD11MAgNO3CuNO32ABAgCDM12.3ABCD644281381______2345678144[CaH2Ob]ab15616101_______________________2B_________:________________________________________3AC____________________________44X____Y______2241712CO2MgCO2CO2Mg1A2B3aDbAMgCO2D41MgO2MgCO335D1231812SiO2CaOFe2O3SiO25FeCl3KSCNFeCl3pH3.8FeCl3FeOH3CaCl2+Na2CO3CaCO3+2NaCl1CaCl2___________________________________21CaCl22_________________________________________________3CaCl2HClFeCl33HClFeCl3___________________1FeCl32Na2CO32CaCl2_________11219(12)7.3%pH16(1)()(2)10.6%Na2CO3Na2CO3Na2CO3/g10203040506070/g01n345mm______10gNa2CO3__________(3)2Na2CO3Na2CO37123361.C2.B3.A4.A5.B6.B7.C8.D9.C10.B11.D12.D52813.14.2CaH2ObbCH4+2abCO2ab15.++++++16.12Cu+2AgNO3CuNO32+2Ag34FeCuSO42241712CO2HCl3ba4MgOMgCO3518.1CaCO3+2HClCaCl2+H2O+CO22CaCl2HClFe2O3FeCl3FeCl31FeCl382Na2CO3211219(12)1xHCl=50g7.3%=3.65gCaCO3+2HCl=CaCl2+H2O+CO273443.65gx=x=2.2g(2)5gNa2CO3+2HCl2NaCl+H2O+CO2(3)