Q. 54.5( 198 Votes )

Translate the following statements into chemical equations and then balance them:
(a) Hydrogen gas combines with nitrogen to form ammonia.

(b) Hydrogen sulphide gas burns in air to give water and sulphur dioxide.

(c) Barium chloride reacts with aluminium sulphate to give aluminium chloride solution and a precipitate of barium sulphate.

(d) Potassium metal reacts with water to give potassium hydroxide and hydrogen

Answer :

(a) Hydrogen gas combines with nitrogen to form ammonia.
The equation of the above reaction is
H2 (g) + N2 (g) → NH3 (g)
Step 1 - To balance chemical equations, first list the number of atoms of a different type that are present in the chemical equation on both sides –

 Step 2 - To start balancing, we take all compound in the reaction and start balancing the reaction

Hence the Balanced Chemical Equation is 3H2 + N2  →2NH3

The following questions are solved similarly.
(b)
Hydrogen sulphide gas burns in air to give water and sulphur dioxide.
The equation of the above chemical change is
H2S + O2 → H2O + SO2
Step 1 - To balance chemical equations, first list the number of atoms of a different type that are present in the chemical equation on both sides –

Step 2 - To start balancing, we take all compound in the reaction and start balancing the reaction

 
Hence, the Balanced Chemical Equation is

2H2S (g) + 3O2 (g) → 2H2O (l) + 2SO2 (g)

 The following questions are solved similarly


(c) Barium chloride reacts with aluminium sulphate to give aluminium chloride solution and a precipitate of barium sulphate.

The equation of the above reaction is
BaCl2 + Al2(SO4)3 (aq) → AlCl3 (aq) +BaSO4 (s)
Step 1 - To balance chemical equations, first list the number of atoms of a different type that are present in the chemical equation on both sides –

 

Step 2 - To start balancing, we take all compound in the reaction and start balancing the reaction.  

  

Thus, we get
3BaCl2 (aq) + Al2(SO4)3 (aq) → 2AlCl3 (aq) + 3BaSO4 (s)

 
(d) Potassium metal reacts with water to give potassium hydroxide and hydrogen

The equation of the above reaction is
K + H2O → KOH +H2
Step 1 - To balance chemical equations, first list the number of atoms of a different type that are present in the chemical equation on both sides –

 

Step 2 - To start balancing, we take all compound in the reaction and start balancing the reaction

Thus, using the above table the balanced chemical equation is
2K (s) + 2H2O (l) → 2KOH (aq) + H2 (g)

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