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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NCERT Solutions for Chapter 1: Chemical Reactions and Equations
Also Check
Chapter 2: Acids, Bases and Salts
Chapter 3: Metals and Non-Metals
Chapter 4: Carbon and its compounds
Chapter 5: Periodic Classification of Elements
Chapter 6: Life Processes
Chapter 7: Control and Coordination
Chapter 8: How do organisms reproduce?
Chapter 9: Heredity and Evolution
Chapter 10: Light - Reflection and Refraction
Chapter 11: The Human Eye and the Colourful World
Chapter 12: Electricity
Chapter 13: Magnetic Effects of Electric Current
Chapter 14: Sources of Energy
Chapter 15: Our Environment
Chapter 16: Sustainable Management of Natural Resources
Check out Frequently Asked Questions (FAQs) for Chapter 1: Chemical Reactions and Equations
What is a balanced chemical equation?
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.
What is rust?
It is a brown mass known as hydrated ferric oxide. Its formula is Fe2O3. xH2O.
Which chemical process is used for obtaining a metal from its oxide?
The process is known as the reduction of metal oxide.
Why is it necessary to balance a chemical equation?
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.
Name two metals which do not get corroded.
Gold (Au) and platinum (Pt) do not get corroded.