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Title: Chemical Reactions and Equations
Description: Chemical Reactions and Equation for Grade 10th Level with formula but no picture included
Description: Chemical Reactions and Equation for Grade 10th Level with formula but no picture included
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CHAPTER – 1
Chemical Reaction
and equations
: –henever a chemical change occurs we can say that
W
a chemical reaction has taken place
example – Food gets digested in our body
– Rusting of iron
...
q
Physical state of the reactant and products are mentioned to make chemical
reaction more informative
...
q alancing Equation :– e balance the chemical equation so that no
...
eg Fe + H 2 3 Han be written as
2 → Fe
O
O + 2
c
3 Fe(s) + 4H (g) 2 3
2
O → Fe
O (s) +4H
2
(g)
q ombination Reaction :–
C
The reaction in which two or more substances
combine to form a new single substance
eg CaO+ H ⎯→ a(OH)
(s) 2 (⎯
O l
)
C
2 (aq)
Calcium Water Calciumhydroxide
oxide (slaked lime)
Quick lime
– Ca(OH)laked lime is used for white washing walls
...
3
a
Ca(OH) CO
2(aq)+ 2(g)
⎯⎯→ aCO H2 (
C
3(s)+ l
O )
Calcium Calcium
hydroxide Carbonate
– Burning of Coal
C+ O ⎯⎯→ O + heat + light
(s) 2(g)
C 2(g)
Exothermic Reactions :–
Reaction in which heat is released along with the
formation of products
...
CH + 2O ⎯⎯→O + 2H (g)
4(g)
2(g)
C 2(g) 2
O
– Respiration is also exothermic reaction
...
De compositon Reactions :–
The reaction in which a single substance
decomposes to give two or more substances
...
2Ba(OH) NHl →
2
+
4 ⎯⎯
C
2BaCl NH H
2
+
4
O
–
Displacement Reaction :
The chemical Reaction in which an element
displaces another element from its solution
Fe+ CuSO ⎯⎯→ 4 Cu
(s)
4(aq)
FeSO (s)
+
Copper (aq)
Sulphate Iron Sulphate
– The nail becomes brownish in colour and the blue colour of Copper Sulphate
solution fade
...
They displace copper
–
Double Displacement Reaction :
The reaction in which two different atoms
or group of atoms are mutually exchanged
eg
...
The insoluble substance
is called precipitate
...
eg
...
2Cu + O ⎯et
2 H ⎯ → 2CuO
⎯
a⎯
When Copper is heated a black colour appears
...
–
Redox Reaction :
The reaction in which one reactant gets oxidised while
other gets reduced
–
Corrosion : hen a metal is attacked by substances around it such as
W
moisture, acids etc
...
Reddish brown coating on iron
...
–
Rancidity : hen fats and oils are oxidised they become rancid and their
W
smell and taste change
...
Title: Chemical Reactions and Equations
Description: Chemical Reactions and Equation for Grade 10th Level with formula but no picture included
Description: Chemical Reactions and Equation for Grade 10th Level with formula but no picture included