Chemical
equation
and
reaction
,•Chemical reactions is a chan
in which one or more substan
react to form new substance
with entirely different properti
• Reactants are the reacting substanc
( molecule, atom, ion)
• Products are the new substance form
as a result of the reaction
,Characters of chemical reaction
(i) CHANGE IN STATE ~
Examples:-
CO(G) + H20(G) CH3COH (L) (METHANOL)
H2 (G) + O2 (G) H20(L)
(ii) CHANGE IN COLOUR~
EXAMPLE:-
CuSO4 + Fe FeSO4 + CO
(BLUE COLOUR) (LIGHT GREEN )
Cu + O2 CuO
(BROWN) (BLACK)
, (iii) FORMATION OF PRECIPITATE(settle down of a chemical substance)~
Example:-
Na2SO4 + BaCl2 BaSO4 + NaCl
(iv) CHANGE IN TEMPERATURE~
Example:-
CaO +H20 Ca(OH)2
(v) EVOLUTION OF GAS ~
Example:-
Pb (NO3) 2 PbO + NO2 + O2
equation
and
reaction
,•Chemical reactions is a chan
in which one or more substan
react to form new substance
with entirely different properti
• Reactants are the reacting substanc
( molecule, atom, ion)
• Products are the new substance form
as a result of the reaction
,Characters of chemical reaction
(i) CHANGE IN STATE ~
Examples:-
CO(G) + H20(G) CH3COH (L) (METHANOL)
H2 (G) + O2 (G) H20(L)
(ii) CHANGE IN COLOUR~
EXAMPLE:-
CuSO4 + Fe FeSO4 + CO
(BLUE COLOUR) (LIGHT GREEN )
Cu + O2 CuO
(BROWN) (BLACK)
, (iii) FORMATION OF PRECIPITATE(settle down of a chemical substance)~
Example:-
Na2SO4 + BaCl2 BaSO4 + NaCl
(iv) CHANGE IN TEMPERATURE~
Example:-
CaO +H20 Ca(OH)2
(v) EVOLUTION OF GAS ~
Example:-
Pb (NO3) 2 PbO + NO2 + O2
