号化学双语课件最终版.pptx

1、 Ionic equation1515化学化学1 1班班杜其星杜其星20153641192015364119DefinitionUsing the symbols of ions which actually take part in the reaction to indicate the ionic reaction is called ionic equation.How to write the ionic equation?We take CuSO solution reaction with BaCl solution as example to explain the steps

2、 of writing the ionic equation.Step1.Write the chemical equation of reaction.CuSO4+BaCl2=CuCl2+BaSO4Step2.Dismantle the dissoluble and dissociable substances into ionic form.But the indissoluble and indissociable substances and gases are still written in molecular formula.Cu2+SO42-+Ba2+2Cl-=Cu2+2Cl-

3、+BaSO4Step3.Delete the ions which not take part in the reaction on both sides of the equation.Cu2+SO42-+Ba2+2Cl-=Cu2+2Cl-+BaSO4Step4.Check the equation,both sides the number of atoms and charges are equal,the ionic equation is correct.SO42-+Ba2+=BaSO4Conditionsofionicreactionuindissoluble substances

4、（难溶物质）u(such as BaSO4,AgCl)uindissociable substances（不可分解物质）u(such as H2O)uvolatilizable substances（可挥发物质）u(such as CO2)Exercise:Which of the following reactions can not be indicated by the ionic equation:SO42-+Ba2+=BaSO4?()A.Ba(NO3)2+H2SO4=BaSO4+2HNO3B.BaCl2+Na2SO4=BaSO4+2NaClC.BaCO3+H2SO4=BaSO4+H2O+CO2D.BaCl2+H2SO4=BaSO4+2HClCThank you!Thank you!