Question

The new substances produced in a reaction are called as.
A.Products
B.Reactants
C.Catalyst
D.None of these

Answer 1

Hint: Chemical reactions are the chemical changes in which reactants transform into products by bond-making or bond-breaking or both between different atoms or molecules. When such a reaction is expressed in terms of symbols and formula, it gives us chemical equations.

Complete step by step answer:
A chemical reaction is written as a chemical equation which is expressed in chemical formulas to identify the reactants and products. Representation of a chemical reaction in terms of symbols and chemical formula of the reactants and products taking part in the reaction is known as a chemical equation.
For example, \[N{H_3} + HCl \to N{H_4}Cl\] , in this reaction ammonia and hydrochloric acid are the reactants which on reacting together form ammonium chloride i.e. the product. This is the new substance produced in a reaction as reactants are already available to us.
Let us look at another example, \[Zn(s) + {H_2}S{O_4}(aq) \to ZnS{O_4}(aq) + {H_2}( \uparrow )\] , in this reaction zinc sulphate is produced when solid zinc reacts with sulphuric acid. So, it is the main product formed but along with this liberation of hydrogen gas is marked as a by-product.
If one or more new substances or products with new chemical and physical properties are formed, it is known as chemical change. For example, when copper sulphate reacts with iron, the new substances formed are ferrous sulphate and copper. When a phase change occurs but no new substance or product is formed, it is just a physical change. For example, when water changes to steam, it is a phase change from liquid to gas without any new product formation.

Hence, the correct option is (A).

Note:
Catalyst is a substance that is added to a reaction to enhance its speed without getting consumed in the reaction. Also, the total mass of the products formed in a chemical reaction is equal to the total mass of the reactant that took part in a chemical reaction. Such a reaction is called a balanced chemical equation.
 \[{H_2} + C{l_2} \to 2HCl\]