Chemical Reactions Class X

1. Prepared by :
Mr. Deepak Kumar
M.Sc. (Chemistry), B.Ed.
Academic Officer, Department of Teacher Education
Academic Unit II
SCERT Divisional Office Jammu.
Mobile No.: 9906145868.
Email : deep.bhagat2382@gmail.com
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REACTION

2.  Milk is left at room temperature during summers.
 An iron tawa/pan/nail is left exposed to humid
atmosphere.
 Grapes get fermented.
 Food is cooked.
 Food gets digested in our body.
 We respire.
 Relief we get with a right medicine/injection.
 Inconvenience due to wrong medicine/injection.

3. “One of the main
aims of chemistry is to
understand how
Chemical Reactions
occur.”

4.  Combination
 Decomposition
 Displacement
 Double Displacement
 Precipitation
 Exothermic
 Endothermic
 Oxidation
 Reduction

5. Example:
CaO (s) + H2O (l) Ca(OH)2 (aq.) + Heat
Quick Lime Slaked Lime
C (s) + O2 (g) CO2 (g)
Coal
A Reaction in which a single product is formed from two or
more reactants. It is also called an Addition Reaction.
A B AB

6. Example:
CaCO3 (s) CaO (s) + CO2 (g)
Limestone Quick Lime
A B
A Reaction in which a single reactant breaks down to
give simpler products.
It is opposite of combination reaction. Energy (Heat,
Light or Electricity) is often required. It is also called
Analysis.
AB +

7. A Reaction in which one element displace/remove
another element from its salt solution.
Example:
Fe (s) + CuSO4 (aq) FeSO4 (aq) + Cu (s)
Zn(s) + H2SO4 (aq) ZnSO4 + H2
A B C
+
A B C +

9. Example:
2NH4Cl (aq) + Ba(OH)2(aq) BaCl2 (aq.) + 2NH4OH
White ppt
NOTE: Not all Double-Displacement Reactions result in Precipitation.
A Reaction in which there is an exchange of ions between the reactants.

10. Any Reaction that produces a precipitate (ppt).
Such Reactions produce Insoluble Salts.

11. Reaction in which Heat is given out along with the Product(s).
Example:
CaO (s) + H2O Ca(OH)2 (aq.) + Heat
Quick Lime Slaked Lime

12. Reactions in which Heat is absorbed.

13. “Hot and cold are Nature’s
two hands with which she
cheerfully works.”

14. • Addition/Gain of Oxygen
• Removal/Loss of Hydrogen
2Cu + O2 2CuO
(Black)

15. • Addition/Gain of Hydrogen
• Removal/Loss of Oxygen
CuO + H2 Cu + H2O

16. S. No. Reaction Gain Loss
1 Oxidation
O H
2 Reduction
H O

17. “Where there is a oxidation,
there is always reduction –
Chemistry is essentially a
study of redox systems.”

18. • Analyse and differentiate between various types
of chemical reactions.
• Express Chemical reaction through a chemical
equation.
• Provide examples of different types of chemical
reactions.
• Predict the products of a chemical reaction.
• Apply concepts learnt in everyday problem.

19. From: JKSCERT – Jammu.