Complete the missing components/variables given as x and y in the following reactions (a) Pb(NO3 ) 2 (aq) + 2KI(aq) → PbI2 (x) + 2KNO3 (y) (b) Cu(s) + 2Ag NO3 (aq) → Cu(NO3 ) 2 (aq) + x(s) (c) Zn(s) + H2 SO4 (aq) → ZnSO4 (x) + H2 (y) (d) CaCO3 (s) →x CaO(s) + CO2 (g)

Answer:

Balancing chemical equation refers to balancing the stoichiometric coefficients on the reactants and products side. This must be done as the chemical equation obeys the law of conservation of mass and momentum.

(a) Pb(NO3 ) 2 (aq) + 2KI(aq) → PbI2 (x) + 2KNO3 (y)

Pb(NO3)2 (aq) + 2KI(aq) → PbI2(s) + 2KNO3 (aq)

(b) Cu(s) + 2AgNO3 (aq) → Cu(NO3)2 (aq) + x(s)

Cu(s) + 2AgNO3 (aq) → Cu(NO3)2 (aq) + 2Ag(s)

(c) Zn(s) + H2SO4 (aq) → ZnSO4 (x) + H2 (y)

Zn(s) + H2SO4(aq) → ZnSO4(aq) + H2(g)

(d) CaCO3(s) → x CaO(s) + CO2(g)

CaCO3 (s) → (heat ) CaO(s) + CO2(g)

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