A What is a balanced chemical equation- Why should chemical equations be balanced-b Aluminium burns in chlorine to form aluminium chloride AlCl 3- Write a balanced chemical equation for this reaction-c Potassium metal reacts with water to give potassium hydroxide and hydrogen gas- Write a balanced chemical equation for this reaction-

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Standard X

Chemistry

Mole Concept in Balanced Reaction

a What is a b...

Question

(a) What is a balanced chemical equation? Why should chemical equations be balanced?
(b) Aluminium burns in chlorine to form aluminium chloride (AlCl₃). Write a balanced chemical equation for this reaction.
(c) Potassium metal reacts with water to give potassium hydroxide and hydrogen gas. Write a balanced chemical equation for this reaction.

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Solution

(a) A balanced chemical equation has an equal number of atoms of different elements in the reactants' and products' sides.
Chemical equation should be balanced because if the number of atoms in reactants' or products' side is different, it means that the atoms are either created or destroyed, which is a clear violation of the law of conservation of mass.

(b) 2Al (s) + 3Cl₂ (l) $\to$ 2AlCl₃ (s)

(c) 2K (s) + 2H₂O (l) $\to$ 2KOH (aq) + H₂ (g)

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Q. Potassium metal reacts with water to give potassium hydroxide and hydrogen gas. Write balanced chemical equation for this reaction.

(a) Aluminium hydroxide reacts with sulphuric acid to form aluminium sulphate and water. Write a balanced equation for this reaction.

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Magnesium burns in carbon dioxide to form magnesium oxide equation :

Translate the following statements into chemical equations and then balance them.

(a) Hydrogen gas combines with nitrogen to form ammonia.

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Translate the statement into chemical equation and then balance:

Potassium metal reacts with water to give potassium hydroxide and hydrogen gas.

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