Please enable JavaScript.
Coggle requires JavaScript to display documents.
the role of chemical compunds and reaction, chemical formulae, the valence…
the role of chemical compunds and reaction
Chemical reaction
is a process in which
the starting substances undergo a change
and it brings to a product with new properties
during a chemical reaction
one on more substances
are changed
into others
Reactans
Products
Changes refer to the
motion of electrons
and the
forming or breaking of chemical bounds
the law of conservation of mass
chemical equation need to obey the law of conservation of mass
this law state that
the matter is neither created nor destroyed
so the mass of the substance procuded is always equal
to the mass of the reacting substanced
how to represent chemical reaction
we
use chemical equations
write
reactants and products
linked by a unidirectional arrow
Irreversable
chemical compound
result of a chemical reaction
To break down a compund you need energy
has its own qualities
which distinguish it from the contributing elements
chemical formulae
are the chemist's international shorthand
for describing a substance
They make a chemical compound readily identifiable
helps to understand
what elements
and
how many atoms of each elements
we need
To write it we need to know the
valence
the valence is a measure of the number of single bonds
that an atom of a given element can form
Nevertheless, many reactions are reversible