Therefore, while the Law of Definite Proportions can be used to compare two experiments in which hydrogen and oxygen react to form water, the Law of Definite Proportions can not be used to compare one experiment in which hydrogen and oxygen react to form water, and another experiment in which hydrogen and oxygen react to form hydrogen peroxide (peroxide is another material that can be made from hydrogen and oxygen). 2) Atoms of one element are identical while atoms of different elements are different.
The Law of Definite Proportions applies when elements are reacted together to form the same product. Dalton’s Atomic Theory 1) Elements are made of tiny particles called atoms. Many of us know John Dalton for his Law of Partial Pressures, or maybe his work with the blind. Law of Definite Proportions states that in a given type of chemical substance, the elements are always combined in the same proportions by mass. John Dalton Meteorologist in History Written by: Jenna Hans. The Aristotelian view of the composition of matter held sway for over two thousand years, until English schoolteacher John Dalton helped to revolutionize chemistry with his hypothesis that the behavior of matter could be explained using an atomic theory. Similarly, when 2 grams of A react with 16 grams of B, they must produce 18 grams of C. If 1 gram of A reacts with 8 grams of B, then by the Law of Conservation of Mass, they must produce 9 grams of C. \): If 1 gram of A reacts with 8 grams of B, then by the Law of Definite Proportions, 2 grams of A must react with 16 grams of B.