Balance the chemical equations a) _____ Zn (s) + _____ AgNO3 (aq) → _____ Zn(NO3)2 (aq) + _____ Ag (s) b. _____ N2 (g) + _____ H2 (g) → _____ NH3 (g) c. _____ Mg(OH)2 (aq) + _____ H3PO4 (aq) → _____ H2O (l) + _____ Mg3(PO4)2(aq) d. _____ HNO3 (aq) + _____ Ni (s) → _____ Ni(NO3)2 (aq) + _____ H2 (g) e. _____ Ba(HCO3)2 (s) → _____ BaCO3 (s) + _____ H2O (g) + _____ CO2 (g) f. _____ BaCl2 (aq) + _____ Na2SO4 (aq) → _____ NaCl (aq) + _____ BaSO4 (s) g. _____ Al2(CO3)3 (s) → _____ Al2O3 (s) + _____ CO2 (g) h. _____ Ca (s) + _____ H2O (l) → _____ Ca(OH)2 (aq) + _____ H2 (g) i. _____ LiHCO3 (s) → _____ Li2CO3 (s) + _____ H2O (g) + _____ CO2 (g) j. _____ N2 (g) + _____ O2 (g) → _____ N2O5 (g) k. _____ MgBr2 (aq) + _____ KOH (aq) → _____ KBr (aq) + _____ Mg(OH)2 (s) l. _____ Mn (s) + _____ CuCl (aq) → _____ Cu (s) + _____ MnCl2 (s)
Answers
a). 1 Zn (s) + 2 AgNO3 (aq) → 1 Zn(NO3)2 (aq) + 2 Ag (s)
b). 1 N2 (g) + 3 H2 (g) → 2 NH3 (g)
c). 3 Mg(OH)2 (aq) + 2 H3PO4 (aq) → 6 H2O (l) + 1 Mg3(PO4)2(aq)
d). 2 HNO3 (aq) + 1 Ni (s) → 1 Ni(NO3)2 (aq) + 1 H2 (g)
e). 1 Ba(HCO3)2 (s) → 1 BaCO3 (s) + 1 H2O (g) + 2 CO2 (g)
f). 1 BaCl2 (aq) + 1 Na2SO4 (aq) → 2 NaCl (aq) + 1 BaSO4 (s)
g). 1 Al2(CO3)3 (s) → 1 Al2O3 (s) + 3 CO2 (g)
h). 1 Ca (s) + 2 H2O (l) → 1 Ca(OH)2 (aq) + 1 H2 (g)
i). 2 LiHCO3 (s) → 1 Li2CO3 (s) + 1 H2O (g) + 1 CO2 (g)
j). 2 N2 (g) + 5 O2 (g) → 2 N2O5 (g)
k). 1 MgBr2 (aq) + 2 KOH (aq) → 2 KBr (aq) + 1 Mg(OH)2 (s)
l). 1 Mn (s) + 2 CuCl (aq) → 2 Cu (s) + 1 MnCl2 (s)
m). 8 Zn (s) + 1S8 (s) → 8 ZnS (s)
Explanation:
- To balance chemical equations, balancing the various elements on both sides of the equation is called balancing.
- It is necessary to balance the equation because according to the law of conservation of mass, neither chemical formation nor destruction of mass occurs in any chemical reaction.
- Accordingly, the mass on both sides should be the same and that is possible only if the number of atoms of the elements on both sides is equal.
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