In decomposition reaction, a single reactant breaks down into two or more simpler product, while in combination reaction two or more reactant combine to form a single product. Therefore decomposition and combination reaction are opposite. Example of decomposition : (i) 2FeSO4(s) Read more
In decomposition reaction, a single reactant breaks down into two or more simpler product, while in combination reaction two or more reactant combine to form a single product. Therefore decomposition and combination reaction are opposite.
Decompositive reaction in presence of Heat: 2Pb(NO3)2 (s) -- Heat → 2PbO (s) + 4NO2(g) + O2(g) Lead Nitrate Leadoxide Nitrogen dioxide Oxygen Decompositive reaction in presence of Light: 2AgCl - Light→ Read more
Decompositive reaction in presence of Heat:
2Pb(NO3)2 (s) — Heat → 2PbO (s) + 4NO2(g) + O2(g)
Lead Nitrate Leadoxide Nitrogen dioxide Oxygen
Decompositive reaction in presence of Light:
2AgCl – Light→ 2Ag + Cl2 gas
Silver Chloride (white) (grey)
Decompositive reaction by the use of electricity:
Displacement Reaction : In this reaction more reactive element displaces the less reactive element AB + C → AC + B eg.: (i) Fe + CuSO4 → FeSO4 + Cu (ii) Pb + CuCl2 → PbCl2 + Cu Double Displacement Reaction : In this reaction exchange of ions takes place AB Read more
Displacement Reaction : In this reaction more reactive element displaces the less reactive element
AB + C → AC + B
eg.:
(i) Fe + CuSO4 → FeSO4 + Cu
(ii) Pb + CuCl2 → PbCl2 + Cu
Double Displacement Reaction : In this reaction exchange of ions takes place
In a chemical reaction a insoluble substance (precipitate) is formed is called precipitation reaction. eg.: (i) AgNO3 + NaCl → AgCl + NaNO3 Silver Sodium Silver Sodium nitrate Chloride Chloride nitrate (ii) NaRead more
In a chemical reaction a insoluble substance (precipitate) is formed is called precipitation reaction.
Why are decomposition reactions called the opposite of combination reactions? Write equations for these reactions.
In decomposition reaction, a single reactant breaks down into two or more simpler product, while in combination reaction two or more reactant combine to form a single product. Therefore decomposition and combination reaction are opposite. Example of decomposition : (i) 2FeSO4(s) Read more
In decomposition reaction, a single reactant breaks down into two or more simpler product, while in combination reaction two or more reactant combine to form a single product. Therefore decomposition and combination reaction are opposite.
Example of decomposition :
(i) 2FeSO4(s) —Heat→ Fe2O3(s) + SO2(g) + SO3(g)
Ferrous sulphate Ferric oxide
(ii) CaCO3(s) —Heat→ CaO(s) + Co2(g)
Lime stone Quick lime
Example of combination :
(i) CaO(s) + CO2(g) → CaCO3(s)
Quick lime Carbon dioxide Lime stone
(ii) Burning of coal →
C(s) + O2(g) → CO2(g)
See lessWrite one equation each for decomposition reactions where energy is supplied in the form of heat, light or electricity.
Decompositive reaction in presence of Heat: 2Pb(NO3)2 (s) -- Heat → 2PbO (s) + 4NO2(g) + O2(g) Lead Nitrate Leadoxide Nitrogen dioxide Oxygen Decompositive reaction in presence of Light: 2AgCl - Light→ Read more
Decompositive reaction in presence of Heat:
2Pb(NO3)2 (s) — Heat → 2PbO (s) + 4NO2(g) + O2(g)
Lead Nitrate Leadoxide Nitrogen dioxide Oxygen
Decompositive reaction in presence of Light:
2AgCl – Light→ 2Ag + Cl2 gas
Silver Chloride (white) (grey)
Decompositive reaction by the use of electricity:
2H2O (l) — Electricity→ 2H2 (g) + O2 (g)
water hydrogen gas oxygen gas
See lessWhat is the difference between displacement and double displacement reactions? Write equations for these reactions.
Displacement Reaction : In this reaction more reactive element displaces the less reactive element AB + C → AC + B eg.: (i) Fe + CuSO4 → FeSO4 + Cu (ii) Pb + CuCl2 → PbCl2 + Cu Double Displacement Reaction : In this reaction exchange of ions takes place AB Read more
Displacement Reaction : In this reaction more reactive element displaces the less reactive element
AB + C → AC + B
eg.:
(i) Fe + CuSO4 → FeSO4 + Cu
(ii) Pb + CuCl2 → PbCl2 + Cu
Double Displacement Reaction : In this reaction exchange of ions takes place
AB + CD → AC + BD
eg.:
(i) Na2SO4 + BaCl2 → 2NaCl + BaSO4
See less(ii) HCl + AgNO3 → AgCl + HNO3
In the refining of silver, the recovery of silver from silver nitrate solution involved displacement by copper metal. Write down the reaction involved.
Reaction occurs as: 2AgNO3 + Cu → Cu(NO3)2 + 2Ag Silver Copper Copper Silver nitrate nitrate
Reaction occurs as:
2AgNO3 + Cu → Cu(NO3)2 + 2Ag
See lessSilver Copper Copper Silver
nitrate nitrate
What do you mean by a precipitation reaction? Explain by giving examples.
In a chemical reaction a insoluble substance (precipitate) is formed is called precipitation reaction. eg.: (i) AgNO3 + NaCl → AgCl + NaNO3 Silver Sodium Silver Sodium nitrate Chloride Chloride nitrate (ii) NaRead more
In a chemical reaction a insoluble substance (precipitate) is formed is called precipitation reaction.
eg.:
(i) AgNO3 + NaCl → AgCl + NaNO3
Silver Sodium Silver Sodium
nitrate Chloride Chloride nitrate
(ii) Na2SO4 + BaCl2 → BaSO4 + 2NaCl
See lessSodium Barium Barium Sodium
Sulphate Chloride Sulphate Chloride
(ppt)