Science
Chemisrty
Notes
Chemical reactions &
Equations
,I. Fundamental Concepts &
Definitions
What is a Change? A
transformation in the physical or
chemical properties of a
substance.
Physical Change: Identity
remains the same; only physical
properties like shape, size, or
state change (e.g., Dry ice
sublimation, wax melting).
Chemical Change: Identity
changes and a new substance is
formed (e.g., Rusting of iron,
digestion, fermentation,
combustion of wax).
, Chemical Reaction: A process
where substances undergo a
transformation resulting in the
formation of new substances
with different properties.
Chemical Equation: A symbolic
representation of a chemical
reaction using symbols and
formulas to represent reactants
(starting materials) and products
(substances produced).
Catalyst: A substance that
speeds up or slows down a
chemical reaction without being
consumed itself.
Precipitate: An insoluble solid
that settles down after the
Chemisrty
Notes
Chemical reactions &
Equations
,I. Fundamental Concepts &
Definitions
What is a Change? A
transformation in the physical or
chemical properties of a
substance.
Physical Change: Identity
remains the same; only physical
properties like shape, size, or
state change (e.g., Dry ice
sublimation, wax melting).
Chemical Change: Identity
changes and a new substance is
formed (e.g., Rusting of iron,
digestion, fermentation,
combustion of wax).
, Chemical Reaction: A process
where substances undergo a
transformation resulting in the
formation of new substances
with different properties.
Chemical Equation: A symbolic
representation of a chemical
reaction using symbols and
formulas to represent reactants
(starting materials) and products
(substances produced).
Catalyst: A substance that
speeds up or slows down a
chemical reaction without being
consumed itself.
Precipitate: An insoluble solid
that settles down after the
