Explanation: (a) Lead is getting reduced is incorrect as lead oxide is getting reduced. (b) Carbon dioxide is getting oxidised is incorrect answer as carbon is getting oxidised. (c) Carbon is getting oxidised is correct answer. (d) Lead oxide is getting reduced is correct answer.
Explanation:
(a) Lead is getting reduced is incorrect as lead oxide is getting reduced.
(b) Carbon dioxide is getting oxidised is incorrect answer as carbon is getting oxidised.
(c) Carbon is getting oxidised is correct answer.
(d) Lead oxide is getting reduced is correct answer.
Correct answer is (d). In this example displacement reaction occurs, because Fe in Fe2O3 has been displaced by Al. Aluminium being more reactive than Iron, it displaces iron to form Aluminium oxide Al2O3.
Correct answer is (d).
In this example displacement reaction occurs, because Fe in Fe2O3 has been displaced by Al. Aluminium being more reactive than Iron, it displaces iron to form Aluminium oxide Al2O3.
A balanced chemical equation is an equation in which the number of each element are equal on the reactant side as well as in product side. for example: BaCl2 + K2SO4 → BaSO4 + 2KCl reactant side product side Chemical equation should be balanced because only aRead more
A balanced chemical equation is an equation in which the number of each element are equal on the reactant side as well as in product side.
for example: BaCl2 + K2SO4 → BaSO4 + 2KCl
reactant side product side
Chemical equation should be balanced because only a balanced equation tells us the relative quantities of different reactants and product involved in the reaction.
(a) Hydrogen gas combines with nitrogen to form ammonia H2 + N2 ---------→ NH3 Hydrogen gas + nitrogen gas -→ Ammonia 3H2 + N2 -----------→ 3NH3 Hydrogen gas + NItrogen gas -→ Ammonia (b) HydrogRead more
(a) Hydrogen gas combines with nitrogen to form ammonia
H2 + N2 ———→ NH3
Hydrogen gas + nitrogen gas -→ Ammonia
3H2 + N2 ———–→ 3NH3
Hydrogen gas + NItrogen gas -→ Ammonia
(b) Hydrogen sulphide gas burns in air to give water and sulpur dioxide
H2S(g) + O2(g) —-→ H2O(l) + SO2(g)
Hydrogen sulphide gas + Oxygen (from air) -→ water + Sulpur dioxide
2H2S(g) + 3O2(g) -→ 2H2O(l) + 2SO2(g)
(c) Barium chloride reacts with aluminium sulphate to give aluminium chloride and a precipitate of barium sulphate
(a) 2KBr + BaI2 → 2KI + BaBr2 Type of reaction: Double displacement reaction. Because the cation K+ and Ba2+ have exchanged their anions Br- and SO42- . (b) ZnCO3 → ZnO + CO2 Type of reaction: Decomposition reaction. Because in this reaction single reactant break down into two productRead more
(a) 2KBr + BaI2 → 2KI + BaBr2
Type of reaction: Double displacement reaction. Because the cation K+ and Ba2+ have exchanged their anions Br– and SO42- .
(b) ZnCO3 → ZnO + CO2
Type of reaction: Decomposition reaction. Because in this reaction single reactant break down into two product
(c) H2 + Cl2 → 2HCl
Type of reaction: Combination. Because in this reaction two reactant combine into single product.
(d) Mg + 2HCl → MgCl2 + H2
Type of reaction : disclacement reaction because H in HCl has been displaced by Mg.
Exothermic reaction: A reaction in which energy is released in the form of heat or light. Eg.: Burning of Natural gas (methane) CH4(g) + O2(g) → CO2(g) + H2O(l) + Heat Endothermic reaction: A reaction in which energy is absorbed from the surroundings and cooling is produced. Eg.: DecomposiRead more
Exothermic reaction: A reaction in which energy is released in the form of heat or light.
Eg.: Burning of Natural gas (methane)
CH4(g) + O2(g) → CO2(g) + H2O(l) + Heat
Endothermic reaction: A reaction in which energy is absorbed from the surroundings and cooling is produced.
Eg.: Decomposition of calcium carbonate
CaCO3(s) ————-→ CaO(s) + CO2(g)
Calcium Carbonate Calcium oxide Carbon dioxide
or Lime stone or quick lime
Respiration is a process in which we inhale oxygen from the atmosphere which oxidises glucose in our body to produce carbon dioxide, water and heat is evolved. C6H12O6(aq) + 6O2(g) ----------> 6CO2 + 6H 2O(l) + Heat Hence, heat is evolved during respiration it is considered as an exothermicRead more
Respiration is a process in which we inhale oxygen from the atmosphere which oxidises glucose in our body to produce carbon dioxide, water and heat is evolved.
C6H12O6(aq) + 6O2(g) ———-> 6CO2 + 6H 2O(l) + Heat
Hence, heat is evolved during respiration it is considered as an exothermic reaction.
Which of the statements about the reaction below are incorrect? 2PbO(s) + C(s) ® 2Pb(s) + CO2(g)
Explanation: (a) Lead is getting reduced is incorrect as lead oxide is getting reduced. (b) Carbon dioxide is getting oxidised is incorrect answer as carbon is getting oxidised. (c) Carbon is getting oxidised is correct answer. (d) Lead oxide is getting reduced is correct answer.
Explanation:
(a) Lead is getting reduced is incorrect as lead oxide is getting reduced.
(b) Carbon dioxide is getting oxidised is incorrect answer as carbon is getting oxidised.
(c) Carbon is getting oxidised is correct answer.
(d) Lead oxide is getting reduced is correct answer.
See lessFe2O3 + 2Al gives Al2O3 + 2Fe
Correct answer is (d). In this example displacement reaction occurs, because Fe in Fe2O3 has been displaced by Al. Aluminium being more reactive than Iron, it displaces iron to form Aluminium oxide Al2O3.
Correct answer is (d).
In this example displacement reaction occurs, because Fe in Fe2O3 has been displaced by Al. Aluminium being more reactive than Iron, it displaces iron to form Aluminium oxide Al2O3.
See lessWhat happens when dilute hydrochloric acid is added to iron fillings? Tick the correct answer.
Correct answer is (a). Explanation : Fe + 2HCl → FeCl2 + H2 Iron Hydrochloric Ferrous Hydrogen acid chloride gas or Iron chloride
Correct answer is (a).
Explanation : Fe + 2HCl → FeCl2 + H2
See lessIron Hydrochloric Ferrous Hydrogen
acid chloride gas
or Iron
chloride
What is a balanced chemical equation? Why should chemical equations be balanced?
A balanced chemical equation is an equation in which the number of each element are equal on the reactant side as well as in product side. for example: BaCl2 + K2SO4 → BaSO4 + 2KCl reactant side product side Chemical equation should be balanced because only aRead more
A balanced chemical equation is an equation in which the number of each element are equal on the reactant side as well as in product side.
for example: BaCl2 + K2SO4 → BaSO4 + 2KCl
reactant side product side
Chemical equation should be balanced because only a balanced equation tells us the relative quantities of different reactants and product involved in the reaction.
See lessTranslate the following statements into chemical equations and then balance them.
(a) Hydrogen gas combines with nitrogen to form ammonia H2 + N2 ---------→ NH3 Hydrogen gas + nitrogen gas -→ Ammonia 3H2 + N2 -----------→ 3NH3 Hydrogen gas + NItrogen gas -→ Ammonia (b) HydrogRead more
(a) Hydrogen gas combines with nitrogen to form ammonia
H2 + N2 ———→ NH3
Hydrogen gas + nitrogen gas -→ Ammonia
3H2 + N2 ———–→ 3NH3
Hydrogen gas + NItrogen gas -→ Ammonia
(b) Hydrogen sulphide gas burns in air to give water and sulpur dioxide
H2S(g) + O2(g) —-→ H2O(l) + SO2(g)
Hydrogen sulphide gas + Oxygen (from air) -→ water + Sulpur dioxide
2H2S(g) + 3O2(g) -→ 2H2O(l) + 2SO2(g)
(c) Barium chloride reacts with aluminium sulphate to give aluminium chloride and a precipitate of barium sulphate
BaCl2(aq) + Al2(SO4)3(aq) ——–→ AlCl3(aq) + BaSO4(s)
Barium chloride + Aluminium sulphate→ Aluminium chloride + Barium sulphate
3BaCl2(aq) + Al2(SO4)3(aq) ——-→ 2AlCl3(aq) + 3BaSO4(s)
(d) Potassium metal reacts with water to give potassium hydroxide and hydrogen gas
K(s) + H2O(l) —–→ KOH(aq) + H2(g)
Potassium + Water -→ potassium hydroxide + hydrogen gas
2K(s) + 2H2O(l) -→ 2KOH(q) + H2(g)
See lessBalance the following chemical equations.
(a) 2HNO3 + Ca(OH)2 → Ca(NO3)2 + 2H2O (b) 2NaOH + H2SO4 → Na2SO4 + 2H2O (c) NaCl + AgNO3 → AgCl + NaNO3 (d) BaCl2 + H2SO4 → BaSO4 + 2HCl
(a) 2HNO3 + Ca(OH)2 → Ca(NO3)2 + 2H2O
(b) 2NaOH + H2SO4 → Na2SO4 + 2H2O
(c) NaCl + AgNO3 → AgCl + NaNO3
(d) BaCl2 + H2SO4 → BaSO4 + 2HCl
See lessWrite the balanced chemical equations for the following reactions.
(a) Calcium hydroxide + Carbon dioxide → Calcium carbonate + Water Ca(OH)2 + CO2 → CaCO3 + H2O (b) Zinc + Silver nitrate → Zinc nitrate + Silver Zn + AgNO3 → Zn(NO3)2 + Ag (c) Aluminium + Copper chloride → Aluminium chloride + Copper 2Al + 3CuCl2 → 2AlCl3 + 3Cu (d) BRead more
(a) Calcium hydroxide + Carbon dioxide → Calcium carbonate + Water
Ca(OH)2 + CO2 → CaCO3 + H2O
(b) Zinc + Silver nitrate → Zinc nitrate + Silver
Zn + AgNO3 → Zn(NO3)2 + Ag
(c) Aluminium + Copper chloride → Aluminium chloride + Copper
2Al + 3CuCl2 → 2AlCl3 + 3Cu
(d) Barium chloride + Potassium sulphate → Barium sulphate + Potassium chloride
BaCl2 + K2SO4 → BaSO4 + 2KCl
See lessWrite the balanced chemical equation for the following and identify the type of reaction in each case.
(a) 2KBr + BaI2 → 2KI + BaBr2 Type of reaction: Double displacement reaction. Because the cation K+ and Ba2+ have exchanged their anions Br- and SO42- . (b) ZnCO3 → ZnO + CO2 Type of reaction: Decomposition reaction. Because in this reaction single reactant break down into two productRead more
(a) 2KBr + BaI2 → 2KI + BaBr2
Type of reaction: Double displacement reaction. Because the cation K+ and Ba2+ have exchanged their anions Br– and SO42- .
(b) ZnCO3 → ZnO + CO2
Type of reaction: Decomposition reaction. Because in this reaction single reactant break down into two product
(c) H2 + Cl2 → 2HCl
Type of reaction: Combination. Because in this reaction two reactant combine into single product.
(d) Mg + 2HCl → MgCl2 + H2
See lessType of reaction : disclacement reaction because H in HCl has been displaced by Mg.
What does one mean by exothermic and endothermic reactions? Give examples.
Exothermic reaction: A reaction in which energy is released in the form of heat or light. Eg.: Burning of Natural gas (methane) CH4(g) + O2(g) → CO2(g) + H2O(l) + Heat Endothermic reaction: A reaction in which energy is absorbed from the surroundings and cooling is produced. Eg.: DecomposiRead more
Exothermic reaction: A reaction in which energy is released in the form of heat or light.
Eg.: Burning of Natural gas (methane)
CH4(g) + O2(g) → CO2(g) + H2O(l) + Heat
Endothermic reaction: A reaction in which energy is absorbed from the surroundings and cooling is produced.
Eg.: Decomposition of calcium carbonate
CaCO3(s) ————-→ CaO(s) + CO2(g)
See lessCalcium Carbonate Calcium oxide Carbon dioxide
or Lime stone or quick lime
Why is respiration considered an exothermic reaction? Explain.
Respiration is a process in which we inhale oxygen from the atmosphere which oxidises glucose in our body to produce carbon dioxide, water and heat is evolved. C6H12O6(aq) + 6O2(g) ----------> 6CO2 + 6H 2O(l) + Heat Hence, heat is evolved during respiration it is considered as an exothermicRead more
Respiration is a process in which we inhale oxygen from the atmosphere which oxidises glucose in our body to produce carbon dioxide, water and heat is evolved.
C6H12O6(aq) + 6O2(g) ———-> 6CO2 + 6H 2O(l) + Heat
Hence, heat is evolved during respiration it is considered as an exothermic reaction.
See less