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For questions 18-21, . In each space, classify the reaction type.
18. ____________________ 2LiBr + Pb(NO3) - PbBr2 + 2LiNO3
19. ____________________ Fe + 2HCl - FeCl2 + H2
20. ____________________ CaO + H2O - Ca(OH)2
21. ____________________ NiCl2 - Ni + Cl2

Respuesta :

Answer:

[tex]2LiBr+Pb(NO_3) = PbBr_2+ 2LiNO_3[/tex]  is a double displacement reaction

  • [tex]Fe+2HCl  = FeCl_2+2H_2[/tex] is a redox reaction
  • [tex]CaO+H_2 O = Ca(OH)_ 2[/tex]is a combination reaction
  • [tex]NiCl_2 = Ni+Cl_2[/tex]  is a decomposition reaction

Explanation:

[tex]2LiBr+PbNO_3 = PbBr_2+2LiNO_3[/tex]

                                                       It is of the form [tex]AX+BY = AY+BX[/tex]

                                                       [tex]Fe+2HCl = FeCl_2+H_2[/tex]

Both oxidation and reduction occur in this reaction. Fe gets oxidized and H gets reduced.

                                          [tex]Fe = Fe^(2+)+2e^-[/tex]

                                          [tex]2H^++2e^- = H_2[/tex]

                                          [tex]CaO+H_2 O = Ca(OH)_2[/tex]

It is an exothermic combination reaction. Calcium reacts with water to produce calcium hydroxide and heat is released in this process.

  • [tex]NiCl_2 = Ni+Cl_2[/tex]

It is a decomposition reaction where nickel chloride decomposes to nickel and chlorine.

Answer:

18. Double Displacement Reaction

19. Single Displacement Reaction

20. Synthesis Reaction

21. Decomposition Reaction

Explanation:

Double Displacement formula:

AB + CD --> AD + CB

Single Displacement formula:

A + BC --> AC + B

Synthesis formula:

A + B --> AB

Decomposition formula:

AB --> A + B

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