In chemistry, a chemical reaction is a process that leads to the transformation of one set of chemical substances into another. A chemical equation is a symbolic representation of a chemical reaction. In which the reactant chemicals are represented on the left-hand side of an arrow. and the products of the reaction are represented on the right-hand side of the arrow.
The basic format of a chemical equation is:
Reactants → Products
The reactants and products are represented using chemical formulas. with the number of atoms of each element indicated using a subscript.
Examples of chemical reactions are photosynthesis, rusting, combustion and digestion.
Also Read: Chemical Reactions and Equations Class 10 MCQs
Some key concepts related to chemical reactions and equations include:
- Balancing chemical equations–> to ensure that the number of atoms of each element is conserved in the reaction.
- Types of chemical reactions: synthesis, decomposition, single replacement, double replacement, combustion.
- The use of coefficients in front of the chemical formulas to indicate the relative amounts of each reactant and product involved in the reaction.
- The use of state symbols (s, l, g, aq) to indicate the physical state of each reactant and product in a chemical equation.
Also Read: Chemical Substances – Nature and Behaviour Class 10 MCQs
It’s also important to note that chemical reactions and equations can be described by the changes in the physical states of the reactants and products, and the amounts of heat, light, and sound energy produced and consumed during the reaction.
Notes of Ch 1 Chemical Reactions and Equations Class 10th Chemistry
Q.No. 1. What is a chemical reaction?
A chemical reaction is a process that leads to the transformation of one set of chemical substances to another. During a chemical reaction, the atoms in the reactants are rearranged to form new chemical compounds, called products. The reactants and products in a chemical reaction are identified by their chemical formulas. Chemical reactions can be represented using chemical equations, which use symbols and formulas to show the reactants, products, and the direction of the reaction. The reactant chemicals are represented on the left-hand side of an arrow and the products of the reaction are represented on the right-hand side of the arrow.
Examples of chemical reactions include photosynthesis, rusting, combustion, and digestion.
Also Read: Chemical Substances – Nature and Behaviour Class 10 Notes
It’s also important to note that chemical reactions and equations can be described by the changes in the physical states of the reactants and products, and the amounts of heat, light, and sound energy produced and consumed during the reaction.
Chemical reactions and equations class 10 important questions answers
In a chemical reaction, the reactants are the starting substances that are being transformed into new substances, known as products. The reactants are usually listed on the left side of the arrow in a chemical equation, while the products are listed on the right side of the arrow.
For example, in the chemical reaction of burning methane gas (CH4), the reactant is CH4 and the products are Carbon Dioxide (CO2) and water (H2O).
CH4(g) + 2O2(g) → CO2(g) + 2H2O(l)
It is also common for reactions to have more than one reactant and more than one product. In a balanced chemical equation, the number and type of atoms on the reactant side of the equation are equal to the number and type of atoms on the product side of the equation.
It’s also important to note that chemical reactions can also be described by the changes in the physical states of the reactants and products, and the amounts of heat, light, and sound energy produced and consumed during the reaction.