what is the rule for writing a formula correctly
Answers
Answered by
11
the rule of writting chemical formula is...all u have to know the valancey of the elements then interchange with eachother..for instance water....H₂O ..in water hydrogen n oxygen is present ...valancey of hydrogen is 1 and valancey of oxygen is 2 ...the valancies got interchanged and formed H₂O or water
Answered by
4
this can be by dimensions checking of LHS and RHS of formula if dimensionally wrong , then formula must be wrong. if dimensionally correct then formula maybe correct .
example :- E = mc² is a formula given by Einstein. we check this is dimensionally correct or not ?
LHS = E =energy
dimension of energy =[ ML²T-²]
RHS =mc² = mass × velocity ²
dimensions of mc² = [M][L²T-²] =[ML²T-²]
LHS = RHS
so, this formula, may be correct.
but if we choose
E = mc
LHS = energy = [ML² T-²]
RHS = mass× velocity = [MLT^-1 ]
LHS ≠ RHS
this formula is wrong because this is dimensionally wrong .
so, now in this way you can check formula
example :- E = mc² is a formula given by Einstein. we check this is dimensionally correct or not ?
LHS = E =energy
dimension of energy =[ ML²T-²]
RHS =mc² = mass × velocity ²
dimensions of mc² = [M][L²T-²] =[ML²T-²]
LHS = RHS
so, this formula, may be correct.
but if we choose
E = mc
LHS = energy = [ML² T-²]
RHS = mass× velocity = [MLT^-1 ]
LHS ≠ RHS
this formula is wrong because this is dimensionally wrong .
so, now in this way you can check formula
Similar questions