chp 1 : Some basic concepts of chem

limitation of law of conservation of mass

law of conservation of mass

Definition :

In all physical and chemical changes the total mass of the reactants is equal to that of the products.

Note - Mass is same, No of moles is NOT same

name the laws of chemical combination

• law of conservation of mass

• law of constant / definite proportion

• law of multiple proportion

• law of reciprocal proportion

law of constant/ definite proportion

Definition :

percentage of element in a compound by mass remains same even if the source of the compound is different

example - in water - H : O, will always be [2:16] even if from rain water or ground water, or from chem reaction.

what are isotopes

limitation of law of constant proportion

also, the reverse of the law is not true. eg - alcohol nd ether. (check notes for reference)

law of multiple proportion

limitation of law of multiple proportion

law of reciprocal proportion

example of law of reciprocal proportion