THIS IS PPT CONTAINS CHEMICAL REACTION JUST LIKE COMBINATION, DECOMPOSITION,DISPLACEMENT AND MORE EXAMPLES

1. TYPES OF CHEMICAL
REACTION

2. COMBINATION
REACTION
01
Table of Contents
DECOMPOSITION
REACTION
02 MORE
TYPES
REACTIONS
04
DISPLACEMENT
REACTION
03

3. 01COMBINATION
REACTION

4. TWO REACTANTS COMBINE
TOGETHER TO FORM A
SINGLE PRODUCT
THE REACTANTS MAY BE IN
ELEMENTS ALSO MAY BE IN
THE FORM OF A COMPOUND
A+B=AB
OR
AB+CD=EF
COMBINATION
REACTION

5. EXAMPLES OF COMBINATION
REACTIONS
❏ 4Li + O2 - 2Li2O
❏ C+O2- CO2
❏ CaOH+CO2-CaCO3+H2O
❏ 2Mg+O2-2MgO
❏ NH3+HCl - NH4Cl
❏ S+O2- SO2
❏ H2+Cl2-2HCl
❏ MgO+CO2 - MgCO3
❏ Fe+S - FeS

6. DETAILED EXPLANATION OF SOME
EXAMPLES
❏ BURNING OF MAGNESIUM IN AIR
MAGNESIUM RIBBON BURN WITH A DAZZLING WHITE FLAME AND
CHANGES INTO A WHITE POWDER = 2Mg + O2=2MgO
❏ BURNING OF COAL
C + O2 - CO2
❏ QUICK LIME WITH WATER( IT REACTS VIGOROUSLY )
CaO + H2O - Ca(OH)2+ HEAT
Ca(OH)2 + CO2 - CaCO3 + H2O

7. 02
DECOMPOSITIO
N REACTION

8. IN THIS TYPE OF
REACTION A SINGLE
REACTANT BREAKS
DOWN TO GIIVE
SIMPLER PRODUCTS
AB - A+B
DECOMPOSITION
REACTION

9. EXAMPLES OF DECOMPOSITION
❖ WHEN CALCIUM CARBONATE (LIMESTONE) IS HEATED, IT
DECOMPOSES TO CALCIUM OXIDE (QUICK LIME) AND
CARBON DIOXIDE
CaCO3+HEAT- CaO + CO2
❖ LEAD NITRATE POWDER ON HEATING DECOMPOSES TO
GIVE BROWN FUMES OF NITROGEN DIOXIDE WITH
CRACKLE SOUND
2Pb(NO3)2 + HEAT - 2PbO + 4NO2 + O2

10. TYPES OF DECOMPOSITION
REACTIONS
● THERMAL DECOMPOSITION = WHEN A DECOMPOSITION REACTION IS CARRIED OUT
BY HEATING, IT IS CALLED A THERMAL DECOMPOSITION REACTION
EXAMPLES
● DECOMPOSITION OF LIMESTONE BY HEATING IS AN EXAMPLE OF THERMAL
DECOMPOSITION
CaCO3 - CaO + CO2
● GREEN VITRIOL LOSE WATER WHEN HEATED AND DECOMPOSES TO FERRIC OXIDE
AND SULPHUR TRIOXIDE. IT GIVES SMELL OF BURNING SULPHUR (WAFTING GAS)
FeSO4.7H20 +HEAT= FeSO4+ H2O
2FeSO4+ HEAT - Fe2O3 + SO2 =SO3

11. TYPES OF DECOMPOSITION
REACTION
❖ PHOTOCHEMICAL DECOMPOSITION= IF THE ENERGY OF SUNLIGHT (IN
THE FORM OF PHOTONS) IS USED TO CARRY OUT THE
DECOMPOSITION REACTION. IT IS PHOTOCHEMICAL DECOMPOSITION
2H2O2 + SUNLIGHT= 2H20 + O2
❖ CERTAIN PHOTOCHEMICAL DECOMPOSITION REACTIONS ARE USED IN
BLACK AND WHITE PHOTOGRAPHY
2AgBr+SUNLIGHT- 2Ag + Br2
2AgCl+SUNLIGHT - 2Ag = CL2

12. TYPES OF DECOMPOSITION
REACTION
❖ ELECTROLYTIC DECOMPOSITION= IF THE ELECTRIC CURRENT IS USED
TO CARRY OUT DECOMPOSITION REACTION, IT IS CALLED
ELECTROLYTIC DECOMPOSITION
EXAMPLE :
ELECTROLYSIS OF WATER= IT IS DECOMPOSITION OF WATER INTO
OXYGEN AND HYDROGEN GAS WHEN AND ELECTRIC CURRENT IS
PASSED THROUGH WATER CONTAINING FEW DROPS OF DILUTE
SULPHURIC ACID
2H2O + 6V= 2H2 + O2

13. PROCEDURE FOR DECOMPOSITION OF
WATER
PROCEDURE: Action of electricity on water (electrolysis)- Water can be broken down into
its component elements by passing electricity through it. This process is called electrolysis.
The electrolysis apparatus consists of 6 volt battery, two platinum electrodes. When a
current from a 6 volt battery is sent through the water. The H+ and OH- ions move to
oppositely charged electrodes. Hydrogen gas will bubble at cathode and the oxygen will
bubble at anode. The gases collected during he electrolysis can be tested with a glowing
splint (which will flame up in the presence of oxygen) and burning splint (which will ignite
hydrogen, causing an audible pop. H2 gas is produced at twice the rate of O2 gas in this
reaction. Record your observations based on what happens with glowing splint at both
electrodes.

14. SOME EXAMPLES OF ELECTROLYTIC
DECOMPOSITION
❖ ON PASSING ELECTRIC CURRENT THROUGH THE MOLTEN
SODIUM CHLORIDE, SODIUM METAL AND CHLORINE GAS ARE
FORMED
2NaCl + CURRENT - 2Na + Cl2
❖ ON PASSING ELECTRIC CURRENT THROUGH MOLTEN
ALUMINIUM OXIDE, ALUMINIUM METAL AND OXYGEN GAS ARE
FORMED
2Al2O3 + CURRENT - 4Al + 3O2

15. 03DISPLACEMENT
REACTION

16. ❖ WHEN AN IRON NAIL IS PLACED IN THE BLUE COLOURED AQUEOUS
SOLUTION OF COPPER SULPHATE, AFTER SOME TIME IT IS FOUND
THAT THE INTENSITY OF THE BLUE COLOUR OF THE SOLUTION
SLOWLY DECREASES AND IRON NAIL BECOMES BROWNISH IN
COLOUR DUE TO DEPOSITION OF COPPER.
Fe + CuSO4 - FeSO4 + Cu
IN THIS REACTION, IRON IS BEING MORE REACTIVE, HAS DISPLACED
COPPER, FROM COPPER SULPHATE SOLUTION
EXAMPLES OF DISPLACEMENT
REACTION

17. EXAMPLES OF DISPLACEMENT REACTION
❖ IN REFINING SILVER FROM NITRATE SOLUTION INVOLVES
DISPLACEMENT OF SILVER BY COPPER METAL
2AgNO3 + Cu - Cu(NO3)2 + 2Ag
❖ AS WELL AS WHEN IRON REACTS WITH THE STREAM. EVEN Fe
DISPLACES H2 TO FORM HEMATITE AND BY PRODUCT H2
3Fe + 4H2O - Fe3O4 + 4H2

18. IN THESE REACTIONS, TWO
COMPOUNDS REACT BY
EXCHANGE OF IONS OF TWO
NEW COMPOUNDS. IN THIS
REACTION, GENERALLY
PRECIPITATION OCCURS.
DOUBLE DISPLACEMENT
REACTION

19. ❖ ON MIXING SODIUM SULPHATE (Na2SO4) SOLUTION WITH BARIUM CHLORIDE (BaCl2) IS
FORMED.
Na2SO4 + BaCl2 - BaSO4 + 2NaCl
❖ ON MIXING SILVER NITRATE SOLUTION WITH SODIUM CHLORIDE SOLUTION, A PRECIPITATE
OF AgCl IS FORMED
AgNO3 + NaCl - AgCl + NaNO3
❖ WHEN LEAD LEAD NITRATE SOLUTION IS ADDED TO POTASSIUM IODIDE SOLUTION, THEN A
YELLOW PRECIPITATE OF LEAD IODIDE IS FORMED ALONG WITH POTASSIUM NITRATE
SOLUTION
2KI + Pb(NO3)2 - PbI2 + 2KNO3
SOME EXAMPLES OF DOUBLE DISPLACEMENT
REACTION

20. NEUTRALIZATION REACTION
❖ THE REACTION IN WHICH, ACIDS REACT WITH BASES TO FORM SALT
AND WATER ESSENTIALLY IS DILUTED AQUEOUS SOLUTION ARE KNOW
AS NEUTRALIZATION REACTION
ACID + BASE - SALT + WATER + HEAT
❖ EXAMPLE= HCl: + NAOH - NaCl + H2O
❖ WHERE THE ACID CONTAINS H+ IONS AND BASE CONTAINS OH- IONS
WHERE IT REACTS VIGOROUSLY TO FORM NEUTRAL PRODUCTS
❖ NEUTRALIZATION REACTION IS AN “EXOTHERMIC REACTION” AS WELL
AS “DOUBLE DISPLACEMENT REACTION”

21. A PRESENTATION BY
S.AJAY ADITHYA
10 D
THANK YOU
8524400