Question

Explain with the help of chemical equations what happens when:-
A.Copper is heated strongly in the air.
B.Iron is reacted with steam
C.Sodium is reacted with dilute sulphuric acid.
D.Zinc is added to sodium hydroxide.

Answer 1

Before answering this question, we should know what a chemical equation is. The symbolic representations or descriptions of chemical reactions in which the reactants and products are shown in terms of their respective chemical equations. The chemical equation should be balanced because the number of atoms on both sides of the equation should be equal as it sticks to the Law of the conservation.

Complete answer:
The copper is heated in air, it reacts with the oxygen that is present in the air to form a black compound i.e copper oxide.
$2Cu+{{O}_{2}}\xrightarrow{heat}2CuO$
The metal is reacted with the steam and it results in the formation of metal oxide and hydrogen gas. The red hot iron is reacted with the steam to form iron (II, III) oxide and hydrogen.
$3Fe(s)+4{{H}_{2}}O\to F{{e}_{3}}{{O}_{4}}+{{H}_{2}}$
The Sodium metal (Na) is dissolved readily in dilute sulphuric acid (${{H}_{2}}S{{O}_{4}}$), it forms a solution containing the sodium ion together with hydrogen gas.
The sodium hydroxide (NaOH) solution is heated with the zinc granules which results in the formation of sodium zincate and hydrogen gas. The base and metal react resulting in the formation of salt, the metal composed of the negative ion.
$2Na+{{H}_{2}}S{{O}_{4}}\to N{{a}_{2}}S{{O}_{4}}+{{H}_{2}}$
The granules of zinc are kept in copper sulphate solution which makes the blue color of copper sulphate go away and the solution becomes colorless. Zinc is more reactive than copper resulting in the displacement of copper from copper sulphate solution and forms zinc sulphate.
$Zn+2NaOH\to N{{a}_{2}}Zn{{O}_{2}}+{{H}_{2}}$

Note:
The chemical Symbols are representative of various chemicals, elements, and various actions in chemistry. If someone wants to pursue chemistry, They should be familiar with all the symbols. The coefficients that are seen in the chemical equations are used to represent the amount of that particular substance present in the equation.