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【配平化学方程式的方法】初三的化学方程式配平

来源:名资汇网 caiji007 2023-06-21 09:05:00

  初中化学前的知识点可是不少,大家总是犯愁这么零碎的知识点该如何记忆啊?。小编在此整理了初三的化学方程式配平,希望能帮助到您。

  (一)最小公倍数法

  这种方法适合常见的难度不大的化学方程式.例如,KClO3→KCl+O2↑在这个反应式中右边氧原子个数为2,左边是3,则最小公倍数为6,因此KClO3前系数应配2,O2前配3,式子变为:2KClO3→KCl+3O2↑,由于左边钾原子和氯原子数变为2个,则KCl前应配系数2,短线改为等号,标明条件即:2KClO3====2KCl+3O2↑(反应条件为二氧化锰催化和加热.MnO2写在等号上方;加热写在等号下方,可用△代替)

  (二)奇偶配平法(原理配平法)

  这种方法适用于化学方程式两边某一元素多次出现,并且两边的该元素原子总数有一奇一偶,例如:C2H2+O2→CO2+H2O,此方程式配平从先出现次数最多的氧原子配起.O2内有2个氧原子,无论化学式前系数为几,氧原子总数应为偶数.故右边H2O的系数应配2(若推出其它的分子系数出现则可配4),由此推知C2H2前2,式子变为:2C2H2+O2→CO2+2H2O,由此可知CO2前系数应为4,最后配单质O2为5,把短线改为等号,写明条件即可:2C2H2+5O2==4CO2+2H2O

  e.g.(1)从化学式较复杂的一种生成物推求有关反应物化学式的化学计量数和这一生成物的化学计量数;

  (2)根据求得的化学式的化学计量数,再找出其它化学式的倾泄计量数,这样即可配平.

  例如:Fe2O3+COFe+CO2

  观察:所以,1个Fe2O3应将3个O分别给3个CO,使其转变为3个CO2.即Fe2O3+3COFe+3CO2再观察上式:左边有2个Fe(Fe2O3),所以右边Fe的系数应为2.即Fe2O3+3CO2Fe+3CO2这样就得到配平的化学方程式了Fe2O3+3CO==2Fe+3CO2(反应条件高温)

  例:配平H2O+Fe→Fe3O4+H2

  第一步:配平氧原子4H2O+Fe→Fe3O4+H2

  第二步:配平氢原子、铁原子4H2O+3Fe→Fe3O4+4H2

  第三步:配平后的化学方程式:4H2O+3Fe==Fe3O4+4H2

  (三)观察法配平

  有时方程式中会出现一种化学式比较复杂的物质,我们可通过这个复杂的分子去推其他化学式的系数。

  例如:Fe+H2O──Fe3O4+H2,Fe3O4化学式较复杂,显然,Fe3O4中Fe来源于单质Fe,O来自于H2O,则Fe前配3,H2O前配4,则式子为:3Fe+4H2O=Fe3O4+H2由此推出H2系数为4,写明条件,短线改为等号即可:3Fe+4H2O(g)==Fe3O4+4H2↑

  (四)归一法

  找到化学方程式中关键的化学式,定其化学式前计量数为1,然后根据关键化学式去配平其他化学式前的化学计量数.若出现计量数为,再将各计量数同乘以同一整数,化分数为整数,这种先定关键化学式计量数为1的配平方法,称为归一法.做法:选择化学方程式中组成最复杂的化学式,设它的系数为1,再依次推断.

  第一步:设NH3的系数为11NH3+O2NO+H2O

  第二步:反应中的N原子和H原子分别转移到NO和H2O中,由此可得1NH3+O2NO+3/2H2O

  第三步:由右端氧原子总数推O2系数1NH3+5/4O2NO+3/2H2O

  第四步:取最小公倍数相乘4NH3+5O2===4NO+6H2O

  相关阅读:初三必背方程式

  一、物质与氧气的反应:

  (1)单质与氧气的反应:

  1.镁在空气中燃烧:2Mg+O2点燃2MgO

  2.铁在氧气中燃烧:3Fe+2O2点燃Fe3O4

  3.铜在空气中受热:2Cu+O2加热2CuO

  4.铝在空气中燃烧:4Al+3O2点燃2Al2O3

  5.氢气中空气中燃烧:2H2+O2点燃2H2O

  6.红磷在空气中燃烧:4P+5O2点燃2P2O5

  7.硫粉在空气中燃烧:S+O2点燃SO2

  8.碳在氧气中充分燃烧:C+O2点燃CO2

  9.碳在氧气中不充分燃烧:2C+O2点燃2CO

  (2)化合物与氧气的反应:

  10.一氧化碳在氧气中燃烧:2CO+O2点燃2CO2

  11.甲烷在空气中燃烧:CH4+2O2点燃CO2+2H2O

  12.酒精在空气中燃烧:C2H5OH+3O2点燃2CO2+3H2O

  二、几个分解反应:

  13.水在直流电的作用下分解:2H2O通电2H2↑+O2↑

  14.加热碱式碳酸铜:Cu2(OH)2CO3加热2CuO+H2O+CO2↑

  15.加热氯酸钾(有少量的二氧化锰):2KClO3====2KCl+3O2↑

  16.加热高锰酸钾:2KMnO4加热K2MnO4+MnO2+O2↑

  17.碳酸不稳定而分解:H2CO3===H2O+CO2↑

  18.高温煅烧石灰石:CaCO3高温CaO+CO2↑

  三、几个氧化还原反应:

  19.氢气还原氧化铜:H2+CuO加热Cu+H2O

  20.木炭还原氧化铜:C+2CuO高温2Cu+CO2↑

  21.焦炭还原氧化铁:3C+2Fe2O3高温4Fe+3CO2↑

  22.焦炭还原四氧化三铁:2C+Fe3O4高温3Fe+2CO2↑

  23.一氧化碳还原氧化铜:CO+CuO加热Cu+CO2

  24.一氧化碳还原氧化铁:3CO+Fe2O3高温2Fe+3CO2

  25.一氧化碳还原四氧化三铁:4CO+Fe3O4高温3Fe+4CO2

  四、单质、氧化物、酸、碱、盐的相互关系

  (1)金属单质+酸--------盐+氢气(置换反应)

  26.锌和稀硫酸Zn+H2SO4=ZnSO4+H2↑

  27.铁和稀硫酸Fe+H2SO4=FeSO4+H2↑

  28.镁和稀硫酸Mg+H2SO4=MgSO4+H2↑

  29.铝和稀硫酸2Al+3H2SO4=Al2(SO4)3+3H2↑

  30.锌和稀盐酸Zn+2HCl===ZnCl2+H2↑

  31.铁和稀盐酸Fe+2HCl===FeCl2+H2↑

  32.镁和稀盐酸Mg+2HCl===MgCl2+H2↑

  33.铝和稀盐酸2Al+6HCl==2AlCl3+3H2↑

  (2)金属单质+盐(溶液)-------另一种金属+另一种盐

  34.铁和硫酸铜溶液反应:Fe+CuSO4===FeSO4+Cu

  35.锌和硫酸铜溶液反应:Zn+CuSO4===ZnSO4+Cu

  36.铜和硝酸汞溶液反应:Cu+Hg(NO3)2===Cu(NO3)2+Hg

  (3)碱性氧化物+酸--------盐+水

  37.氧化铁和稀盐酸反应:Fe2O3+6HCl===2FeCl3+3H2O

  38.氧化铁和稀硫酸反应:Fe2O3+3H2SO4===Fe2(SO4)3+3H2O

  39.氧化铜和稀盐酸反应:CuO+2HCl====CuCl2+H2O

  40.氧化铜和稀硫酸反应:CuO+H2SO4====CuSO4+H2O

  41.氧化镁和稀硫酸反应:MgO+H2SO4====MgSO4+H2O

  42.氧化钙和稀盐酸反应:CaO+2HCl====CaCl2+H2O

  (4)酸性氧化物+碱--------盐+水

  43.苛性钠暴露在空气中变质:2NaOH+CO2====Na2CO3+H2O

  44.苛性钠吸收二氧化硫气体:2NaOH+SO2====Na2SO3+H2O

  45.苛性钠吸收三氧化硫气体:2NaOH+SO3====Na2SO4+H2O

  46.消石灰放在空气中变质:Ca(OH)2+CO2====CaCO3↓+H2O

  47.消石灰吸收二氧化硫:Ca(OH)2+SO2====CaSO3↓+H2O

  (5)酸+碱--------盐+水

  48.盐酸和烧碱起反应:HCl+NaOH====NaCl+H2O

  49.盐酸和氢氧化钾反应:HCl+KOH====KCl+H2O

  50.盐酸和氢氧化铜反应:2HCl+Cu(OH)2====CuCl2+2H2O

  51.盐酸和氢氧化钙反应:2HCl+Ca(OH)2====CaCl2+2H2O

  52.盐酸和氢氧化铁反应:3HCl+Fe(OH)3====FeCl3+3H2O

  53.氢氧化铝药物治疗胃酸过多:3HCl+Al(OH)3====AlCl3+3H2O

  54.硫酸和烧碱反应:H2SO4+2NaOH====Na2SO4+2H2O

  55.硫酸和氢氧化钾反应:H2SO4+2KOH====K2SO4+2H2O

  56.硫酸和氢氧化铜反应:H2SO4+Cu(OH)2====CuSO4+2H2O

  57.硫酸和氢氧化铁反应:3H2SO4+2Fe(OH)3====Fe2(SO4)3+6H2O

  58.硝酸和烧碱反应:HNO3+NaOH====NaNO3+H2O

  (6)酸+盐--------另一种酸+另一种盐

  59.大理石与稀盐酸反应:CaCO3+2HCl===CaCl2+H2O+CO2↑

  60.碳酸钠与稀盐酸反应:Na2CO3+2HCl===2NaCl+H2O+CO2↑

  61.碳酸镁与稀盐酸反应:MgCO3+2HCl===MgCl2+H2O+CO2↑

  62.盐酸和硝酸银溶液反应:HCl+AgNO3===AgCl↓+HNO3

  63.硫酸和碳酸钠反应:Na2CO3+H2SO4===Na2SO4+H2O+CO2↑

  64.硫酸和氯化钡溶液反应:H2SO4+BaCl2====BaSO4↓+2HCl

  (7)碱+盐--------另一种碱+另一种盐

  65.氢氧化钠与硫酸铜:2NaOH+CuSO4====Cu(OH)2↓+Na2SO4

  66.氢氧化钠与氯化铁:3NaOH+FeCl3====Fe(OH)3↓+3NaCl

  67.氢氧化钠与氯化镁:2NaOH+MgCl2====Mg(OH)2↓+2NaCl

  68.氢氧化钠与氯化铜:2NaOH+CuCl2====Cu(OH)2↓+2NaCl

  69.氢氧化钙与碳酸钠:Ca(OH)2+Na2CO3===CaCO3↓+2NaOH

  (8)盐+盐-----两种新盐

  70.氯化钠溶液和硝酸银溶液:NaCl+AgNO3====AgCl↓+NaNO3

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