Question

(a) Describe the reaction of potassium with water. Write the equation of the reaction involved.
(b) Write an equation of the reaction of iron with steam. Indicate the physical states of all the reactants and products.
(c) Which gas is produced when dilute hydrochloric acid is added to a reactive metal?

Answer 1

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Question : Describe the reaction of potassium with water. Write the equation of the reaction involved.

Answer : Potassium reacts violently with cold water to form potassium hydroxide and hydrogen gas: 2K(s)+ 2H2O(l) --------> 2KOH(aq) + H2(g) + heat. In this reaction so much heat is produced get hydrogen gas formed catches fire and burns explosively.

Question : Write an equation of the reaction of iron with steam. Indicate the physical states of all the reactants and products.

Answer : Please refer to the attachment !!

Question : Which gas is produced when dilute hydrochloric acid is added to a reactive metal

Answer : When a reactive metal reacts with hydrochloric acid hydrogen gas is produced A reactive metal displaces the hydrogen from acid and release hydrogen gas. Answer: hydrogen gas is evolved when the dilute hydrochloric acid added to a reactive metal when iron reacts with dilute H2SO4 the evolution of gas is formed.

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Answer 2

Explanation:

• (a) Potassium reacts with cold water violently to form hydrogen gas and potassium hydroxide.  
• (b) When the iron reacts with steam, the reactants and products physical states appear as below:

                     $2 H_{2} O(l)+2 K(s) \rightarrow 2 K O H(a q)+\text { Heat }+H_{2}(g)$

                     $3 F e(s)+4 H_{2} O(g) \rightarrow 4 H_{2}(g)$$3 F e(s)+4 H_{2} O(g) \rightarrow 4 H_{2}(g)$

• (c) When dilute hydrochloric acid is added to a reactive metal, hydrogen gas is produced.
• When Potassium reacts with atomospheric oxygen, within few seconds of exposure, flaky white potassium peroxide is formed.