How does aluminum metal react with water? Write a balanced chemical equation.

Q. Write a balanced chemical equation when calcium carbide reacts with water.

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

Q.

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

(b) Aluminium burns is chlorine to form aluminium chloride $\left(AlC{l}_3\right)$. 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.

Q. Which gas is liberated when dilute hydrochloric acid reacts with zinc metal? Write a balanced chemical equation for the reaction which takes place. How will you test this gas? Name a metal which produces the same gas just by reacting with cold water.