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