CHEMICAL REACTIONS AND EQUATIONS FULL DETAILED STUDY NOTES

CHEMICAL REACTIONS AND EQUATIONS
DETAILED STUDY NOTES

 CHEMICAL REACTION

The transformation of chemical substance into another
chemical substance is known as Chemical Reaction. For
example: Rusting of iron, the setting of milk into curd,
digestion of food, respiration, etc.



 REACTANT
Substances which take part in a chemical reaction
are called reactants.


 PRODUCT
New substance formed after a chemical reaction is
called a product.


 CHARACTERSTICS OF CHEMICAL REACTIONS:
1.Evolution of gas: The chemical reaction
between zinc and dilute sulphuric acid is
characterised by the evolution of hydrogen
gas. Zn(s) + H2SO4(aq) → ZnSO4(aq) + H2(g)
↑

, 2.Change in Colour: The chemical reaction
between citric acid and purple coloured
potassium permanganate solution is
characterised by a change in colour from
purple to colourless.
The chemical reaction between sulphur
dioxide gas and acidified potassium
dichromate solution is characterized by a
change in colour from orange to green.
3.Change in state of substance: The
combustion reaction of candle wax is
characterised by a change in state from
solid to liquid and gas.
4.Change in temperature: The chemical reaction
between quick lime water to form slaked
lime is characterized by a change in
temperature (which is a rise in
temperature).
The chemical reaction between zinc
granules and dilute sulphuric acid is also
characterised by a change in temperature
(which is a rise in temperature).
5.(v) Formation of precipitate: The
chemical reaction between sulphuric acid
and barium chloride solution is
characterised by the formation of a white