Question

balancing chemical equations
refer to page for detailed instructions on how to balance chemical equations.
balance each chemical equation by inserting the correct coefficients, or numbers.

1. _ni₃ → _n₂ + _i₂
2. _fe₂o₃ + _hcl → _fecl₃ + _h₂o
3. _zn + _cu₃n₂ → _cu + _zn₃n₂
4. _pbcl₂ + _nai → _pbi₂ + _nacl
5. _h₂s + _al → _h₂ + _al₂s₃
6. _as + _o₂ → _as₂o₅
7. _al + _i₂ → _all₃
8. _hgo → _hg + _o₂
9. _ba + _hoh → _h₂ + _ba(oh)₂
10. _k + _br₂ → _kbr
11. _sio₂ + _hf → _sif₄ + _h₂o
12. _s + _o₂ → _so₃
13. _cl₂ + _febr₃ → _fecl₃ + _br₂
14. _h₂ + _f₂ → _hf
15. _li + _h₂o → _lioh + _h₂
16. _cul₂ + _fe → _fei₂ + _cu
17. _bn + _f₂ → _bf₃ + _n₂
18. _fecl₃ + _ca(oh)₂ → _fe(oh)₃ + _cacl₂

Explanation:

Step1: Balance the first equation

For \( \text{NI}_3
ightarrow\text{N}_2+\text{I}_2 \), balance nitrogen and iodine. \( 2\text{NI}_3
ightarrow\text{N}_2 + 3\text{I}_2 \)

Step2: Balance the second equation

For \( \text{Fe}_2\text{O}_3+\text{HCl}
ightarrow\text{FeCl}_3+\text{H}_2\text{O} \), balance Fe, O, H and Cl. \( \text{Fe}_2\text{O}_3 + 6\text{HCl}
ightarrow2\text{FeCl}_3+3\text{H}_2\text{O} \)

Step3: Balance the third equation

For \( \text{Zn}+\text{Cu}_3\text{N}_2
ightarrow\text{Cu}+\text{Zn}_3\text{N}_2 \), balance Zn and Cu. \( 3\text{Zn}+\text{Cu}_3\text{N}_2
ightarrow3\text{Cu}+\text{Zn}_3\text{N}_2 \)

Step4: Balance the fourth equation

For \( \text{PbCl}_2+\text{NaI}
ightarrow\text{Pbl}_2+\text{NaCl} \), balance Cl and Na. \( \text{PbCl}_2 + 2\text{NaI}
ightarrow\text{Pbl}_2+2\text{NaCl} \)

Step5: Balance the fifth equation

For \( \text{H}_2\text{S}+\text{Al}
ightarrow\text{H}_2+\text{Al}_2\text{S}_3 \), balance S and Al. \( 3\text{H}_2\text{S}+2\text{Al}
ightarrow3\text{H}_2+\text{Al}_2\text{S}_3 \)

Step6: Balance the sixth equation

For \( \text{As}+\text{O}_2
ightarrow\text{As}_2\text{O}_5 \), balance As and O. \( 4\text{As}+5\text{O}_2
ightarrow2\text{As}_2\text{O}_5 \)

Step7: Balance the seventh equation

For \( \text{Al}+\text{I}_2
ightarrow\text{All}_3 \), balance Al and I. \( 2\text{Al}+3\text{I}_2
ightarrow2\text{All}_3 \)

Step8: Balance the eighth equation

For \( \text{HgO}
ightarrow\text{Hg}+\text{O}_2 \), balance O. \( 2\text{HgO}
ightarrow2\text{Hg}+\text{O}_2 \)

Step9: Balance the ninth equation

For \( \text{Ba}+\text{HOH}
ightarrow\text{H}_2+\text{Ba(OH)}_2 \), balance Ba, H and O. \( \text{Ba}+2\text{HOH}
ightarrow\text{H}_2+\text{Ba(OH)}_2 \)

Step10: Balance the tenth equation

For \( \text{K}+\text{Br}_2
ightarrow\text{KBr} \), balance K and Br. \( 2\text{K}+\text{Br}_2
ightarrow2\text{KBr} \)

Step11: Balance the eleventh equation

For \( \text{SiO}_2+\text{HF}
ightarrow\text{SiF}_4+\text{H}_2\text{O} \), balance Si, O, H and F. \( \text{SiO}_2 + 4\text{HF}
ightarrow\text{SiF}_4+2\text{H}_2\text{O} \)

Step12: Balance the twelfth equation

For \( \text{S}+\text{O}_2
ightarrow\text{SO}_3 \), balance S and O. \( 2\text{S}+3\text{O}_2
ightarrow2\text{SO}_3 \)

Step13: Balance the thirteenth equation

For \( \text{Cl}_2+\text{FeBr}_3
ightarrow\text{FeCl}_3+\text{Br}_2 \), balance Cl and Br. \( 3\text{Cl}_2 + 2\text{FeBr}_3
ightarrow2\text{FeCl}_3+3\text{Br}_2 \)

Step14: Balance the fourteenth equation

For \( \text{H}_2+\text{F}_2
ightarrow\text{HF} \), balance H and F. \( \text{H}_2+\text{F}_2
ightarrow2\text{HF} \)

Step15: Balance the fifteenth equation

For \( \text{Li}+\text{H}_2\text{O}
ightarrow\text{LiOH}+\text{H}_2 \), balance Li, H and O. \( 2\text{Li}+2\text{H}_2\text{O}
ightarrow2\text{LiOH}+\text{H}_2 \)

Step16: Balance the sixteenth equation

For \( \text{Cul}_2+\text{Fe}
ightarrow\text{Fell}_3+\text{Cu} \), balance Fe and I. \( 3\text{Cul}_2 + 2\text{Fe}
ightarrow2\text{Fell}_3+3\text{Cu} \)

Step17: Balance the seventeenth equation

For \( \text{BN}+\text{F}_2
ightarrow\text{BF}_3+\text{N}_2 \), balance B, N and F. \( 2\text{BN}+3\text{F}_2
ightarrow2\text{BF}_3+\text{N}_2 \)

Step18: Balance the eighteenth equation

For \( \text{FeCl}_3+\text{Ca(OH)}_2
ightarrow\text{Fe(OH)}_3+\text{CaCl}_2 \), balance Fe, Cl, Ca and O. \( 2\text{FeCl}_3+3\text{Ca(OH)}_2
ightarrow2\text{Fe(OH)}_3+3\text{CaCl}_2 \)

Answer:

1. \( 2\text{NI}_3

ightarrow\text{N}_2 + 3\text{I}_2 \)

1. \( \text{Fe}_2\text{O}_3 + 6\text{HCl}

ightarrow2\text{FeCl}_3+3\text{H}_2\text{O} \)

1. \( 3\text{Zn}+\text{Cu}_3\text{N}_2

ightarrow3\text{Cu}+\text{Zn}_3\text{N}_2 \)

1. \( \text{PbCl}_2 + 2\text{NaI}

ightarrow\text{Pbl}_2+2\text{NaCl} \)

1. \( 3\text{H}_2\text{S}+2\text{Al}

ightarrow3\text{H}_2+\text{Al}_2\text{S}_3 \)

1. \( 4\text{As}+5\text{O}_2

ightarrow2\text{As}_2\text{O}_5 \)

1. \( 2\text{Al}+3\text{I}_2

ightarrow2\text{All}_3 \)

1. \( 2\text{HgO}

ightarrow2\text{Hg}+\text{O}_2 \)

1. \( \text{Ba}+2\text{HOH}

ightarrow\text{H}_2+\text{Ba(OH)}_2 \)

1. \( 2\text{K}+\text{Br}_2

ightarrow2\text{KBr} \)

1. \( \text{SiO}_2 + 4\text{HF}

ightarrow\text{SiF}_4+2\text{H}_2\text{O} \)

1. \( 2\text{S}+3\text{O}_2

ightarrow2\text{SO}_3 \)

1. \( 3\text{Cl}_2 + 2\text{FeBr}_3

ightarrow2\text{FeCl}_3+3\text{Br}_2 \)

1. \( \text{H}_2+\text{F}_2

ightarrow2\text{HF} \)

1. \( 2\text{Li}+2\text{H}_2\text{O}

ightarrow2\text{LiOH}+\text{H}_2 \)

1. \( 3\text{Cul}_2 + 2\text{Fe}

ightarrow2\text{Fell}_3+3\text{Cu} \)

1. \( 2\text{BN}+3\text{F}_2

ightarrow2\text{BF}_3+\text{N}_2 \)

1. \( 2\text{FeCl}_3+3\text{Ca(OH)}_2

ightarrow2\text{Fe(OH)}_3+3\text{CaCl}_2 \)