1Failingthetest2wearuniforms3cleanup4gettoclasslate5strictwith6insteadof7isgoodfor.1JennyisnotallowedtowatchTVOnschoolnights2Jennyhastomakethebedbeforebreakfast.3JennyhastowashdishesafterdinneronMondayandFriday4JennyisallowedtoplaycomputergamesonSaturdayafternoon5Jennyisn’tallowedtochatwithfriendsforalongtimeOnthephone1YOu’renotallowedtosmokehere2Youhavetokeepquiet3You’renotallowedtoturnright4You’renotallowedtoparkyourcarhere5You’reallowedtogoacrosstheroad5:!1isgoodfor2Atpresent3stayup4concentrate,on5learnfrom6haveanopportunity7TheotherdayDCB4.(1)H2SO4+Mg=MgSO4+H2置换反应(2)3H2SO4+2Al=Al2(SO4)3+3H2置换反应(3)H2SO4+Ba(OH)2=BaSO4↓+2H2O复分解反应5.氧化铝氧化酸性或碱性6.镁锌铁铜2HCl+Fe=FeCl2+H27.(1)银丝表面无现象,铁丝表面变红色CuSO4+Fe=FeSO4+Cu(2)活动性:铁>铜>银8.D9.因为铁能与硫酸铜溶液反应从而降低药效(CuSO4+Fe=FeSO4+Cu)10.如稀盐酸2HCl+Fe=FeCl2+H2铁CuCl2+Fe=FeCl2+Cu11.(1)铜铝(2)金属活动性的不同。复习题BCCCBCDABCABAAAAB18。蓝H2SO4+CuO=△CuSO4+H2O19.烧碱(火碱、苛性钠)NaOH潮解CO2+2NaOH=Na2CO3+H2O20.CO2+Ca(OH)2=CaCO3↓+H2O21(1)碱酸(2)红色刚好消失(3)HCl+NaOH=NaCl+H2O22.(1)A(2)不能23.(1)②(2)②H2SO4+Ba(OH)2=BaSO4↓+2H2O复分解反应24.(1)乙、丙、甲、丁(2)表面积25.(1)增大反应物的接触面积,加快与胃酸的作用(2)氢氧化铝的含量为214毫克,没有达到标准。它的质量分数为42.8%。26.(1)75%(2)14.6%
