June 13, 2020
Chemical Reactions
Q.1) What is a chemical equation? What are the steps involved in writing a chemical equation?
Ans) A shorthand representation of a chemical reaction in terms of symbols and formulae of different reactants and products is called a chemical equation. While writing a chemical equation the following steps are involved:
(a) The symbols and formulae of the reactants are written on the left hand side (LHS) with plus (+) sign between them. (b) The symbols and formulae of the products are written on the right hand side (RHS) with plus (+) sign between them. (c) An arrow ( ) sign is put between the reactants and the products, pointing from reactants towards products.
Example: Consider the reaction between zinc and sulphuric acid. This reaction can be written as follows: Zn + H2SO4 ZnSO4 + H2↑ Reactants Products
(Q.2) What are reactants and products?
Ans) Reactants: The substances which take part in chemical reaction are called as reactants.
Products: The new substances formed as a result of a chemical reaction are called as products. For example: In the burning of coke (carbon) in air, carbon and oxygen are the reactants while carbon-dioxide formed is the product.
C + O2 ---------------- CO2
Carbon (coke) Carbondioxid
Reactants Product
Similarly, in the burning of magnesium in air, magnesium and oxygen are the reactants, while magnesium oxide formed is the product.
2Mg + O2 ---------------- 2MgO
Reactants Products
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