Question

The metal M reacts vigorously with water to form a solution S and a gas G. The solution S turns red litmus to blue whereas gas G, which is lighter than air, burns with a pop sound. Metal M has a low melting point and it is used as a coolant in nuclear reactors.
(a) What is metal M?
(b) What is solution S? Is it acidic or alkaline?
(c) What is gas G?
(d) Write a balanced chemical equation for the reaction which takes place when metal M reacts with water.
(e) Is this reaction exothermic or endothermic?

Answer 1

Answer:

metal M is Na sodium , solution is NaOH sodium hydroxide gas G is Hydrogen.solution is alkaline .Na ± H2O ------- NaOH ±H2O plus minus should be cosidered only plus .reaction is exothemic

Answer 2

Answer:

(a) The metal M is sodium.

(b) The solution S is sodium hydroxide. It is an alkaline solution.  

(c) The gas G is hydrogen.

(d) The balanced chemical reaction between metal M and water is:

$\bold{2 N a+2 H_{2} O \rightarrow 2 N a O H+H_{2}}$

(e) This reaction is an exothermic reaction.

Explanation:

• Sodium is a soft metal in silvery white colour. This is an alkali metal. The solution formed by sodium is a basic (alkaline) solution.
• The litmus paper is used to determine whether the solution is acidic and alkaline solution.
• The hydrogen gas does not react with air, as the result is produces red flame before putting out with water as product. The reaction between hydrogen and air is:
• $\bold{2 H_{2(g)}+O_{2(g)} \rightarrow 2 H_{2} O_{(l)}}$
• The sodium hydroxide or caustic soda is white salt which is basic in nature.  
• This reaction is an exothermic reaction as it produces heat energy.

You can get all the answers of Chapter 1 in the link below:

https://brainly.in/question/13848082

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