This document discusses different types of chemical reactions: 1) Combination reactions occur when two or more reactants form a single product like calcium oxide and water forming calcium hydroxide. 2) Decomposition reactions occur when a single compound splits into multiple simpler substances. 3) Displacement reactions occur when a more reactive element displaces a less reactive one from its compound like iron displacing copper from copper sulfate. 4) Double displacement reactions occur when parts of two ionic compounds are exchanged to form two new compounds. 5) Redox (oxidation-reduction) reactions involve the transfer of electrons between reactants.

1. CLASS-10
CHAPTER-1 CHEMICAL
REACTIONS AND CHEMICALS

2. TYPES OF CHEMICAL REACTIONS
Several general types of chemical reactions can occur
based on what happens when going from reactants to
products. The more common types of chemical reactions
are as follows:
● Combination
● Decomposition
● Single displacement
● Double displacement
● Combustion
● Redox

3. COMBINATION REACTION
Calcium oxide reacts vigorously with water to produce slaked lime
(calcium hydroxide) releasing a large amount of heat.
CaO(s) + H2O (l) → Ca(OH)2(s)
In this reaction, calcium oxide and water combine to form a single
product, calcium hydroxide. Such a reaction in which a single product
is formed from two or more reactants is known as a combination reaction.

4. EXAMPLES OF COMBINATION REACTION
• BURNING OF COAL
C + O2 --> CO2
• FORMATIONOFWATER HYDROGENAND OXYGEN
2H2 + O2 -> 2H2O

5. EXOTHERMIC REACTION
An exothermic reaction is a chemical reaction that releases energy through
light or heat. It is the opposite of endothermic Reaction.
Examples Of Exothermic Reactions:
➢BURNING OF NATURALGAS
CH₄ + 2O2 + 2H20

6. DECOMPOSITION REACTION
A decomposition reaction can be defined as a type of chemical reaction
in which under suitable conditions, one single compound splits into
multiple simpler substances.

7. SOME MORE DECOMPOSITION REACTIONS

8. THERMAL DECOMPOSITION
Thermal decomposition, or thermolysis, is a chemical deposition caused by
heat. The decomposition temperature of a substanceis the temperature at
which the substancechemically decomposes. An example of thermal
decomposition reaction is given.

9. WHAT IS DISPLACEMENT REACTION?
Displacement reaction is a chemical reaction in which a more reactive element
displaces a less reactive element from its compound. Both metals and non-metals
take part in displacement reactions.
Example : Reaction of iron nails with copper sulphate solution.

10. AN EXAMPLE OF DISPLACEMENT REACTION

11. WHAT IS DOUBLE DISPLACEMENT REATION?
Double replacement reactions—occur when parts of two
ionic compounds are exchanged, making two new
compounds. The overall pattern of a double replacement
reaction looks like this:

12. AN ACTIVITY OF DOUBLE DISPLACEMENT REACTION

13. OXIDATION AND REDUCTION (REDOX)

14. AN ACTIVITY OF OXIDATION AND REDUCTION
> Heat a china dish containing
about 1g copper powder
(Fig. 1.10).
> What do you observe?

15. WHAT IS CORROSION?
Corrosion is when a refined metal is naturally converted to a more stable form
such as its oxide, hydroxide or sulphide state this leads to deterioration of the
material.

16. WHAT IS RANCIDITY?
Rancidity is a very general term and in its most general meaning, it refers to the
spoilage of a food in such a way that it becomes undesirable (and usually
unsafe) for consumption.

17. PRESENTED BY
ANIL KUMAR