Question

What information does the following chemical equation convey?
$Mg + 2HCl \to MgC{l_2} + {H_2}$

Answer 1

Hint : A reaction is a process in which several starting materials, also called reactants, react with each other to form the final materials called the product. When any reaction is represented in the chemical form then that reaction is termed a chemical reaction. Reaction and equation are the same terminologies in chemistry.

Complete Step By Step Answer:
Any chemical process in which a product is formed, and then that process is represented by the chemical formula of constituents is known as a chemical reaction. Reactions are classified as follows: -
Addition reaction: - a reaction in which one constituent is added to another one. Like ${H_2} + C{l_2} \to 2HCl$
Displacement reaction: - a reaction in which one reactant replaces the parts of another reactant. Like $Mg + 2HCl \to MgC{l_2} + {H_2}$
Double displacement reaction: - a reaction in which both (all) the reactants replace the parts of each other. Like $N{a_2}S{O_4} + BaC{l_2} \to BaS{O_4} + 2NaCl$
Decomposition reaction: - a reaction in which the reactant breaks into different products. Like
Oxidation reaction: - a reaction in which the metal gains the oxygen. Like
Reduction reaction: - a reaction in which the metal loses oxygen. Like
In the given reaction, $Mg + 2HCl \to MgC{l_2} + {H_2}$ , the information we get is that it is a type of Displacement reaction. In this reaction, we also learnt that when magnesium is treated with hydrochloric acid then magnesium chloride is formed and hydrogen gas is liberated.

Note :
A reaction may take place normally at room temperature like conversion of solid water ( ice ) to liquid water. But some reactions require certain conditions like heat, temperature, pressure, etc. Some reactions even require a particular thing to carry it; this particular thing is termed as a catalyst. Examples of catalysts include enzymes, etc.