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The first chapter in Science textbook is 'Chemical Reactions and Equations'.
This chapter discusses about various types of chemical reactions which include combination, decomposition, displacement, double displacement, precipitation, neutralization, exothermic, endothermic, oxidation and reduction reactions.
Chemical Reaction
The transformation of chemical substance into another chemical substance is known as Chemical Reaction.
For example: Rusting of iron, the setting of milk into curd, digestion of food, respiration, etc.
Reactant
Substances which take part in a chemical reaction are called reactants.
Product
New substance formed after a chemical reaction is called a product.
The topics discussed in this chapter are as follows:
- Chemical reaction
- Types of chemical reactions
- Symbols of elements and their valencies
- Balancing of a chemical reaction
- Corrosion
- Rancidity
Students can view and download the chapter from the link given below.
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Check out Frequently Asked Questions (FAQs) for Chapter 1: Chemical Reactions and Equations
An equation that has equal number of atoms of each element on both the sides of the equation is called a balanced chemical equation, i.e., mass of the reactants is equal to mass of the products.
It is a brown mass known as hydrated ferric oxide. Its formula is Fe2O3. xH2O.
The process is known as the reduction of metal oxide.
An equation is balanced in order to satisfy the law of conservation of mass according to which total mass of the reactants is equal to the total mass of the products, i.e., mass can neither be created nor be destroyed during any chemical change.
Gold (Au) and platinum (Pt) do not get corroded.