Advertisements
Advertisements
Question
Giving examples, state the difference between balanced and unbalanced chemical equations.
Advertisements
Solution
| Sr. No. | Balanced chemical equation | Unbalanced chemical equation |
| 1. | A balanced chemical equation has an equal number of atoms of different elements on the sides of reactants and products. | An unbalanced chemical equation has an unequal number of atoms of one or more elements in the reaction. |
| 2. | In a balanced chemical equation, the sum of the masses of the reactants is equal to the sum of the masses of the products. | In an unbalanced chemical equation, the sum of the masses of the reactants is not equal to the sum of the masses of the products. |
| 3. | It obeys the law of conservation of mass. | It does not obey the law of conservation of mass. |
| 4. | Example: \[\ce{Zn + H2SO4 -> ZnSO4 + H2}\] | Example: \[\ce{H2 + O2 -> H2O}\] |
APPEARS IN
RELATED QUESTIONS
Translate the following statement into a chemical equation and then balance it.
Barium chloride reacts with aluminium sulphate to give aluminium chloride and a precipitate of barium sulphate.
Chemical equations are balanced to satisfy the law of ______.
Balance the following chemical equation:
\[\ce{C + CO2 -> CO}\]
Write a balanced chemical equation with state symbols for the following reaction:
Sodium hydroxide solution reacts with hydrochloric acid solution to produce sodium chloride solution and water.
When the solution of substance X is added to a solution of potassium iodide, then a yellow solid separates out from the solution.
- What do you think substance X is likely to be?
- Name the substance which the yellow solid consists of.
- Which characteristic of chemical reactions is illustrated by this example?
- Write a balanced chemical equation for the reaction which takes place. Mention the physical states of all the reactants and products involved in the chemical equation.
Balance the following chemical equation :
Na20 + H20 → NaOH
Balance the following equation :
Pb3O4 → PbO + O2
Balance the following equation. Also name the product formed.
K2O + H2O → KOH
Write your observation and name the product when ron nails are added to an aqueous solution of copper sulphate.
Write down what you understood from the following chemical reaction.
AgNO3(aq) + NaCI(aq) → AgCI ↓ + NaNO3(aq)
Sodium chloride reacts with silver nitrate to produce silver chloride and sodium nitrate
Write the equation.
Check whether it is balanced, if not balance it.
Find the weights of reactants and products.
State the law which this equation satisfies.
Write the balanced chemical equation of the following reaction.
copper + nitric acid → copper nitrate + nitric oxide + water
Write the balanced chemical equation of the following reaction.
sodium chloride + manganese dioxide + sulphuric acid → sodium hydrogen sulphate + manganese sulphate + water + chlorine.
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 – copper carbonate.
\[\ce{2KClO3->[MnO2] 2KCl + 3O2[g] - is a balanced equation.}\]
State why the compound MnO2 is written above the arrow.
Balance the following simple equation:
SO2 + O2 ⇌ SO3
Balance the following simple equation:
FeCl2 + Cl2 → FeCl3
Give a balanced equation by the partial equation method, [steps are given below].
Oxidation of Lead [II] Sulphide by Ozone
- Ozone first decomposes to give molecular oxygen & nascent oxygen.
- Nascent oxygen then oxidises lead [II] sulphide to lead [II] sulphate.
Which of the following is the correct observation of the reaction shown in the above set up?
Complete the following blank in the equation as indicated.
\[\ce{CaH2_{(s)} + 2H2O_{( aq)}-> Ca(OH)2_{(s)} + 2H2_{(g)}}\]
Molecules: 6.02 × 1023 + ______ `→` ______ + ______
