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
chemical compound
result of a chemical reaction
To break down a compund you need energy
chemical formulae
are the chemist's international shorthand
for describing a substance
the valence is a measure of the number of single bonds
that an atom of a given element can form
during a chemical reaction
one on more substances are changed into others
Reactans
Products
the law of conservation of mass
how to represent chemical reaction
Nevertheless, many reactions are reversible
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
has its own qualities
which distinguish it from the contributing elements
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
Changes refer to the motion of electrons
and the forming or breaking of chemical bounds
we use chemical equations
write reactants and products
linked by a unidirectional arrow
Irreversable