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) + 2AgNO3 (aq) ⇢ Cu(NO3)2 (aq) + x (s)
c) Zn (s) + H2SO4 (aq) ⇢ ZnSO4 (x) + H2 (y)
d) CaCO3 (s) ⇢ CaO (x) + CO2 (y)
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) + 2AgNO3 (aq) ⇢ Cu(NO3)2 (aq) + x (s)
c) Zn (s) + H2SO4 (aq) ⇢ ZnSO4 (x) + H2 (y)
d) CaCO3 (s) ⇢ CaO (x) + CO2 (y)
Chemical Reactions:
In a chemical reaction, the reactants react to form new substances known as products. While writing chemical reactions, the reactants and the products are written in the form of chemical formulae, and the state of each species is mentioned along with them in the bracket.
a) Pb(NO3)2 (aq) + 2KI (aq)⇢ PbI2 (x) + 2KNO3 (y)
When aqueous solutions of lead nitrate (Pb(NO3)2) and lead iodide (KI) react then solid precipitates of lead iodide (PbI2) are formed along with the aqueous solution of potassium nitrate (KNO3). The reaction is shown below:
Pb(NO3)2 (aq) + 2KI (aq)⇢ PbI2 (s) + 2KNO3 (aq)
b) Cu (s) + 2AgNO3 (aq) ⇢ Cu(NO3)2 (aq) + x (s)
In the above reaction, copper (Cu) being more reactive displaces the silver (Ag). The reaction is given as:
Cu (s) + 2AgNO3 (aq) ⇢ Cu(NO3)2 (aq) + 2Ag (s)
c) Zn (s) + H2SO4 (aq) ⇢ ZnSO4 (x) + H2 (y)
On dissolving zinc (Zn) in sulfuric acid (H2SO4), zinc sulfate (ZnSO4) is formed and hydrogen gas (H2) is released.
Zn (s) + H2SO4 (aq) ⇢ ZnSO4 (aq) + H2 (g)
d) CaCO3 (s) ⇢ CaO (x) + CO2 (y)
On dissociation of calcium carbonate (CaCO3), solid precipitates of calcium oxide (CaO) are formed and carbon dioxide gas is released. The complete reaction is given as:
CaCO3 (s) ⇢ CaO (s) + CO2 (g)
Chemical Reactions:
In a chemical reaction, the reactants react to form new substances known as products. While writing chemical reactions, the reactants and the products are written in the form of chemical formulae, and the state of each species is mentioned along with them in the bracket.
a) Pb(NO3)2 (aq) + 2KI (aq)⇢ PbI2 (x) + 2KNO3 (y)
When aqueous solutions of lead nitrate (Pb(NO3)2) and lead iodide (KI) react then solid precipitates of lead iodide (PbI2) are formed along with the aqueous solution of potassium nitrate (KNO3). The reaction is shown below:
Pb(NO3)2 (aq) + 2KI (aq)⇢ PbI2 (s) + 2KNO3 (aq)
b) Cu (s) + 2AgNO3 (aq) ⇢ Cu(NO3)2 (aq) + x (s)
In the above reaction, copper (Cu) being more reactive displaces the silver (Ag). The reaction is given as:
Cu (s) + 2AgNO3 (aq) ⇢ Cu(NO3)2 (aq) + 2Ag (s)
c) Zn (s) + H2SO4 (aq) ⇢ ZnSO4 (x) + H2 (y)
On dissolving zinc (Zn) in sulfuric acid (H2SO4), zinc sulfate (ZnSO4) is formed and hydrogen gas (H2) is released.
Zn (s) + H2SO4 (aq) ⇢ ZnSO4 (aq) + H2 (g)
d) CaCO3 (s) ⇢ CaO (x) + CO2 (y)
On dissociation of calcium carbonate (CaCO3), solid precipitates of calcium oxide (CaO) are formed and carbon dioxide gas is released. The complete reaction is given as:
CaCO3 (s) ⇢ CaO (s) + CO2 (g)
