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प्रश्न
Giving examples, state the difference between balanced and unbalanced chemical equations.
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उत्तर
| Balanced Chemical Equation | Unbalanced Chemical Equation |
| A balanced chemical equation has an equal numbers of atoms of different elements in the side of reactants and products. | An unbalanced chemical equation has an unequal number of atoms of one or more elements in the reaction. |
| In a balanced chemical equation the sum of masses of the reactants is equal to the sum of the masses of the products. | In an unbalanced chemical equation the sum of masses of the reactants is not equal to the sum of the masses of the products. |
| It obeys the law of conservation of mass | It does not obey the law of conservation of mass |
| Example: Zn (s) + H2SO4 (aq) → ZnSO4(aq) + H2 (g) Here, number of Zn, H, S and O are same in both reactants' and products' side. |
Example: H2 + O2 → H2O Here, one oxygen atom is more in reactant's side than in product's side; it means one atom of oxygen is being destroyed, which is a violation of law of conservation of mass |
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संबंधित प्रश्न
Balance the following chemical equation.
\[\ce{NaCl + AgNO3 -> AgCl + NaNO3}\]
Write the balanced chemical equation for the following reaction.
\[\ce{Barium chloride + Potassium sulphate → Barium sulphate + Potassium chloride}\]
Write the balanced chemical equation for the following reaction.
\[\ce{Calcium hydroxide + Carbon dioxide → Calcium carbonate + Water}\]
What does the symbol (aq) represent in a chemical equation?
Translate the following statement into chemical equation and then balance the equation:
Phosphorus burns in oxygen to give phosphorus pentoxide.
Balance the given equation:
H2O2 
H2O + O2
Write any two observations in an activity which may suggest that a chemical reaction has taken place. Give an example in support of your answer.
When a mixture of gases X and Y is compressed to 300 atm pressure and then passed over a catalyst consisting of a mixture of zinc oxide and chromium oxide (heated to a temperature of 300°C), then an organic compounds Z having the molecular formula CH4O is formed. X is a highly poisonous gas which is formed in appreciable amounts when a fuel burns in a limited supply of air; Y is a gas which can be made by the action of a dilute acid on an active metal; and Z is a liquid organic compound which can react with sodium metal to produce hydrogen gas.
(a) What are X, Y and Z?
(b) Write a balanced chemical equation of the reaction which takes place when X and Y combine to form Z. Indicate the conditions under which the reaction occurs.
Balance the following equation. Also name the products formed.
`"Mg" + "O"_2 → "MgO"`
While performing the experiment with raisins to determine the percentage of water absorbed by them, a student made following measurements:
Mass of water in the beaker = 40 g
Mass of raisins before soaking = 5 g
Mass of raisins after soaking for 2 hours = 8 g
Mass of water left in the beaker after the experiment = 35 g
The percentage of water absorbed by raisins is:
The step(s) necessary for determining the percentage of water absorbed by raisins is/are:
Balance the following equation:
MnO2 + HCl → MnCl2 + H2O + Cl2
Balance the following equation:
P + HNO3 → NO2 + H2O + H3PO4
Balance the following equation:
Zn + HNO3 `→` Zn(NO3)2 + H2O + NO2
Name the substance that is getting oxidised in the thermit process.
A chemical reaction is generally accompanied by certain external indications or characteristics. These include – change of – (a) colour (b) state (c) smell (d) evolution of gas (e) formation of precipitate (f) evolution or absorption of heat. With reference to change of colour – state the change in colour seen when the following are heated – mercury [II] oxide.
\[\ce{2KClO3->[MnO2] 2KCl + 3O2[g] - is a balanced equation.}\]
Give a reason why the above equation is balanced.
Balance the following simple equation:
N2 + O2 ⇌ NO
Balance the following simple equation:
Mg + N2 → Mg3N2
Which among the following is(are) double displacement reaction(s)?
- `"Pb" + "CuCl"_2 -> "PbCl"_2 + "Cu"`
- `"Na"_2"SO"_4 + "BaCl"_2 -> "BaSO"_4 + 2"NaCl"`
- `"C" + "O"_2 -> "CO"_2`
- `"CH"_4 + 2"O"_2 -> "CO"_2 + 2"H"_2"O"`
