Class 10 Science Chapter 1 Chemical Reactions and Equations deals with the foundation of Chemistry. Students preparing for science class 10 chapter 1 will get to learn from the basics of chemical reactions and equations right up to the complex situations of writing an equation and balancing it. It covers all major concepts in detail, allowing students to understand the ideas better. NCERT Solutions for Class 10 Science Chapter 1 of the section, concentrates on the concept of chemical equations. Here it teaches how to represent chemical reactions in word equation form. It also deals with writing a balanced chemical equation, which is thoroughly discussed in a step-by-step way. Students will also learn about the numerous sorts of chemical reactions, with specific examples. In this chapter, students will also discover the fundamentals of chemical reactions, their types, and the implications of a chemical oxidation reaction in their daily lives.
Chemical reactions play a significant role in our daily lives. All chemical changes are linked to chemical reactions, which are expressed mathematically through equations. In this section, we will look at the many types of chemical changes denoted by chemical reactions and chemical equations.
A chemical reaction is a process that converts one or more substances, and reactants into one or more new compound substances with completely different properties. Reactants are substances that react, such as molecules, ions, and atoms.
Hydrogen + Oxygen → Water
In the above chemical reaction, Hydrogen and Oxygen are the reactants and Water is the product formed due to the reaction.
A chemical equation is a symbolically represented chemical reaction in the form of symbols and formulae, with the reactant entities on the left and the product entities on the right and both separated by an arrowhead pointing towards the products representing the direction of the reaction. The reactants and the products are written with a plus sign (+) between them.
H2 + O2 → H2O
As you can see, the number of atoms in the reactants and products in the preceding equation is not the same on both sides. A skeleton chemical equation is a type of imbalanced equation.
A balanced chemical equation is one in which the total number of atoms of each element on both sides of the equation is equal. The Law of Conservation of Mass states that "mass can neither be created nor destroyed during a chemical reaction," which means that the total mass of the elements present in the products of a chemical reaction must match the total mass of the elements present in the reactants.
Example: To balance the above equation
H2 + O2 → H2O
We choose the element which is unbalanced. It is Oxygen in the reactant side.
No. of atoms of Oxygen in Reactant is 2 and Product is 1, so we multiple product H2O by 2.
H2 + O2 → 2H2O
Now, No. of atoms of Hydrogen in the Reactant is 2 and the Product is 4, so we multiple reactant H2 by 2.
2H2 + O2 → 2H2O
Since the number of atoms of reactants and products is equal, the chemical equation is balanced.
H2 + Cl2 → 2HCl
CaCO3 → CaO + CO2
Fe + CuSO4 → FeSO4 + Cu
Na2SO4 + BaCl2 → BaSO4 + 2NaCl
2Zn + O2 → 2ZnO
CuO + H2 → Cu + H2O
CuO + H2 → Cu + → Cu + H2O
Q1. What is meant by chemical reactions and equations?
Answer: A chemical reaction is a process that converts one or more substances, and reactants into one or more new compound substances with completely different properties. A chemical equation is a symbolic representation of the reaction using formulae, with reactants on the left and products on the right.
Q2. Give an example of a double displacement reaction.
Answer: CuSO4(aq) + 2NaOH(aq) → Cu(OH)2(s) + Na2SO4(aq)
Q3. What is a balanced chemical equation? Why should chemical equations be balanced?
Answer: A balanced chemical equation is one in which the total number of atoms of each element on both sides of the equation is equal. Atoms, according to the rule of conservation of mass, cannot be formed or destroyed. To comply with this universal law, the equation must be balanced so that the total atoms on the left side equal the total atoms on the right side.