44. What is the balanced equation for when Al reacts with NaOH? Is there any method to balance this equation quickly?

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(a) What is a balanced chemical equation ? Why should chemical equations be balanced ?

(b) Aluminium burns is chlorine to form aluminium chloride $(A l C l_{3})$ . Write a balanced chemical equation for this reation.

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

A s_{2} S_{3}

O_{2}

S O_{4}

A s_{2} O_{3}

O_{2}

. . . . . A s_{2} S_{3} (s) + O_{2} (g) \to . . A s_{2} O_{3} (s) + S O_{2} (g)

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

(b) Balance the following chemical equation.

$M n O_{2}$ + HCl $⟶$ $M n C l_{2}$ + $C l_{2}$ + $H_{2} O$

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